作者： Li, Zhuoqing;Wang, Xinqi;Zhang, Beibei;Li, Bingyu;Du, Huihui;...

期刊： Environmental Pollution,2023年326:121488 ISSN：0269-7491

通讯作者： Lei, Ming(leiming@hunau.edu.cn)

作者机构： [Mensah, Caleb Oppong; Zhang, Beibei; Du, Huihui; Li, Bingyu; Wu, Zhibin; Wang, Xinqi; Li, Zhuoqing; Lei, Ming] Hunan Agr Univ, Coll Environm & Ecol, Changsha 410128, Peoples R China.;[Rashid, Azhar] Univ Haripur, Dept Environm Sci, Haripur, Pakistan.

通讯机构： [Lei, Ming] C;College of Resource and Environment, Hunan Agricultural University, Changsha, 410128, PR China. Electronic address:

关键词： Antibiotic resistance genes;Arsenic;Bacterial community;Heavy metal resistance genes;Sulfamethoxazole

摘要： Numerous studies have revealed the spread mechanism of antibiotic resistance genes (ARGs) in single antibiotic-contaminated soils. However, the comprehensive impacts of heavy metals and antibiotics on ARGs and the underlying mechanisms are still unknown. Here, high-throughput quantitative PCR and high-throughput sequencing were used to investigate changes in ARGs and bacterial communities under various sulfamethoxazole (SMX) regimes (0, 1, 10, 50 mg kg−1) in arsenic (As) contaminated soils. The study found that the abundances of ARGs, mobile genetic elements (MGEs), and heavy metal resistance genes (HMRGs) significantly increased in the soil fortified at 10 and 50 mg kg−1 SMX concentrations. The ARGs abundance increased with the increase in the MGEs abundance. Many significant positive correlations between various ARGs subtypes and HMRGs subtypes were found. These results indicate that the HMRGs and MGEs positively contributed to the enrichment of ARGs in As-contaminated soils under SMX stress. Meanwhile, the abundance of copiotrophic (Actinobacteriota) reduced and oligotrophic (Gemmatimonadota) increased, indicating that the life history strategy of the community changed. In addition, Gemmatimonadota was positively correlated to ARGs, HMRGs, and MGEs, suggesting that Gemmatimonadota, which can cope with As and SMX stress, was the host for resistance genes in the soil. Finally, the study found that MGEs play a determinant role in ARGs proliferation due to the direct utilization of HGT, and the indirect effect for ARGs spread under a co-selection mechanism of ARGs and HMRGs, while the bacterial community showed indirect influences by altering environmental factors to act on MGEs. Collectively, this study revealed new insights into the mechanisms of resistance gene transmission under combined SMX and As contamination in soil ecosystems. © 2023 Elsevier Ltd

语种： 英文

作者： Muhammad Jamal Nasir;Abdul Wahab;Tehreem Ayaz*;Sardar Khan;Amir Zeb Khan;...

期刊： Arabian Journal of Geosciences,2023年16(2):1-14 ISSN：1866-7511

通讯作者： Tehreem Ayaz

作者机构： [Muhammad Jamal Nasir; Abdul Wahab] Department of Geography, University of Peshawar, Peshawar, Pakistan;[Tehreem Ayaz] School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, People’s Republic of China;[Sardar Khan] Department of Environmental Sciences, University of Peshawar, Peshawar, Pakistan;[Amir Zeb Khan] PaK-Austria Fachhochschule: Institute of Applied Sciences and Technology, Haripur, Pakistan;[Ming Lei] College of Resources and Environment, Hunan Agricultural University, Changsha, People’s Republic of China

通讯机构： [Tehreem Ayaz] S;School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, People’s Republic of China

关键词： Heavy metals;River sediments;Water quality;Contamination factor;Geo-accumulation index;Pollution load index

摘要： Kalpani River, Pakistan is an important stream that collects more than two third of the untreated domestic, commercial, industrial, and sewerage water, agricultural overflow, and other unwanted effluents of the surrounding area. These effluents have degraded the overall quality of this river water. The current study aims to examine the concentration of selected heavy metal (HM) contamination in Kalpani River sediments. The HMs studied were Pb, Cd, Zn, Ni, Fe, and Cu. Sediment samples were taken from nine selected locations (labeled as P1, P2, P3, … P9) and tested for HM contamination. The HMs contamination level in the sediment was computed using the contamination factor (CF), pollution load index (PLI), and geo-accumulation index (Igeo). All three indicators revealed that the Kalpani River in Mardan city is polluted with hazardous HMs such as Cd, Pb, and Zn. Pb, Ni, Fe, and Cu CF levels in sediment samples ranged from low (< 1) to moderate (1–3). However, the CF values for Cd and Zn indicated being highly polluted (> 6). The PLI values along the Kalpani River varied considerably and were observed lower upstream (P1 and P2, i.e., 0.821), highest (1.229) at the middle course, and lower (0.897) downstream. The Igeo for the studied HMs ranged from moderately to strongly polluted. The primary anthropogenic sources responsible for HM pollution in the Kalpani River were improper waste dumping, untreated sewage urban and industrial wastewater into the river, and excessive pesticide usage.

语种： 英文

作者： Luo, Zipei;Li, Zhen;Sun, Jing;Shi, Kaixiang;Lei, Ming;...

期刊： Journal of Hazardous Materials,2023年448:130877 ISSN：0304-3894

通讯作者： Du, HH

作者机构： [Du, HH; Luo, Zipei; Tie, Boqing; Du, Huihui; Lei, Ming] Hunan Agr Univ, Coll Resources & Environm, Changsha 410127, Peoples R China.;[Li, Zhen] Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China.;[Sun, Jing] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China.;[Shi, Kaixiang] Huazhong Agr Univ, Coll Life Sci & Technol, State Key Lab Agr Microbiol, Wuhan 430070, Peoples R China.

通讯机构： [Du, HH ] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410127, Peoples R China.

关键词： Bioremediation;Detoxification;Metabolism;Physiological models;Proteins;Soil pollution;Tungsten compounds;'current;Contaminated soils;Emerging contaminant;Expression profiling;Homoeostasis;Metabolic pathways;Physiological response;Resistance;Resistance profiles;Transcriptomes;Bacteria;bacterial DNA;chaperone;tetrathionic acid;transcriptome;tungsten;bacterium;bioassay;bioremediation;detoxification;exopolymer;gene expression;homeostasis;microorganism;pollutant removal;tungsten;amino acid metabolism;Article;bacterial growth;bioaccumulation;bioremediation;cell size;cell structure;Citrobacter;controlled study;detoxification;differential gene expression;Fourier transform infrared spectroscopy;homeostasis;KEGG;macromolecule;metabolism;metal binding;nonhuman;phosphate metabolism;phylogeny;polymerization;principal component analysis;type VI secretion system;valence (chemistry);gene expression profiling;homeostasis;transport at the cellular level;Biological Transport;Gene Expression Profiling;Homeostasis;Transcriptome;Tungsten

摘要： Tungsten (W) is an emerging contaminant, and current knowledge on W resistance profiles of microorganisms remains scarce and fragmentary. This study aimed to explore the physiological responses of bacteria under W stress and to resolve genes and metabolic pathways involved in W resistance using a transcriptome expression profiling assay. The results showed that the bacterium Citrobacter sp. Lzp2, screened from W-contaminated soil, could tolerate hundreds of mM W(VI) with a 50% inhibiting concentration of ∼110 mM. To cope with W stress, Citrobacter sp. Lzp2 secreted large amounts of proteins through the type VI secretory system (T6SS) to chelate W oxoanions via carboxylic groups in extracellular polymeric substances (EPS), and could transport cytosolic W outside via the multidrug efflux pumps (mdtABC and acrD). Intracellular W is probably bound by chaperone proteins and metal-binding pterin (tungstopterin) through the sulfur relay system. We propose that tetrathionate respiration is a new metabolic pathway for cellular W detoxification likely producing thio-tungstate. We conclude that multiple mechanisms collectively mediate W homeostasis and resistance in Citrobacter sp. Lzp2. Our results have important implications not only for understanding the intricate regulatory network of W homeostasis in microbes but also for bio-recovery and bioremediation of W in contaminated environments. © 2023 Elsevier B.V.

语种： 英文

作者： Zhou, Min;Yang, Ruijia;Tan, Xiaoyu;Tie, Boqing;Lei, Ming;...

期刊： Adsorption Science & Technology,2022年2022 ISSN：0263-6174

通讯作者： Du, HH

作者机构： [Tan, Xiaoyu; Du, HH; Zhou, Min; Tie, Boqing; Du, Huihui; Lei, Ming; Yang, Ruijia] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Zhou, Min] Yonker Environm Protect Co Ltd, Changsha 410128, Peoples R China.

通讯机构： [Du, HH ] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

摘要： Heavy metals and metalloids are common cooccurrence in contaminated soils, making their behaviors more complex than their individual presences. Adsorption to soil minerals and organic components determines the solubility and mobility of heavy metals. However, little information is available regarding coadsorbing metals (e.g., Cd) and metalloids (e.g., Sb) to soil components, and whether there is a universal coadsorption rule needs to be illuminated. This study investigated the coadsorption behaviors of Cd(II) and Sb(V) to goethite, kaolinite, and bacteria (Bacillus cereus) at both acidic (pH 4.5) and alkaline pH (pH 8.5). Equilibrium adsorption experiments, coupled with scanning electron microscopy- (SEM-) energy-dispersive X-ray spectrum (EDS) and X-ray photoelectron spectroscopy (XPS), were applied to determine the batch adsorption phenomena and possible mechanisms. Batch results showed that Cd(II) adsorption was greater at pH 8.5 whereas Sb(V) adsorption was greater at pH 4.5. The presence of Cd or Sb promoted each other's adsorption to goethite, kaolinite, and bacteria, but slight differences were that Sb(V) preferred to enhance Cd(II) adsorption at acidic pH, whereas Cd(II) was more able to increase Sb(V) adsorption at alkaline pH. SEM-EDS analyses further showed that the distribution of Cd and Sb was colocalized. The surface FeOH, AlOH, and COOH groups participated in the binding of Cd(II) and Sb(V), probably through the formation of inner-sphere complexes. Two possible ternary complexes, i.e., sorbent-Cd2+-Sb(OH)6- and sorbent-Sb(OH)6-Cd2+, were possibly formed. Both the charge effect and the formation of ternary complexes were responsible for the collaborative coadsorbing of Cd-Sb. The universal synergistic rule obtained suggests that current models for predicting Cd(II) or Sb(V) sequestration based on single systems may underestimate their solid-to-liquid distribution ratio in a coexistence situation. The results obtained have important implications for understanding the chemical behavior of Sb and Cd in contaminated soils. © 2022 Min Zhou et al.

语种： 英文

作者： Nasir, Muhammad Jamal;Tufail, Muhammad;Ayaz, Tehreem;Khan, Sardar;Khan, Amir Zeb;...

期刊： Environmental Monitoring and Assessment,2022年194(10):1-18 ISSN：0167-6369

通讯作者： Ayaz, Tehreem(tehreemayaz17301@yahoo.com)

作者机构： [Nasir, Muhammad Jamal; Tufail, Muhammad] Univ Peshawar, Dept Geog, Peshawar 25120, Pakistan.;[Ayaz, Tehreem; Lei, Ming] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Khan, Sardar] Univ Peshawar, Dept Environm Sci, Peshawar 25120, Pakistan.;[Khan, Amir Zeb] PaK Austria Fachhsch, Inst Appl Sci & Technol, Mang 22620, Haripur, Pakistan.

通讯机构： [Tehreem Ayaz] C;College of Resources and Environment, Hunan Agricultural University, Changsha, People’s Republic of China

关键词： Groundwater quality;Vadose zone;Spatial distribution;Geo-processing;Inverse distance weighting;Water pollution

摘要： Groundwater is the drinking water source for the majority of rural settlements of district Nowshera, Khyber Pakhtunkhwa, Pakistan. The study aimed to analyze the groundwater quality and its vulnerability to pollution and to develop its spatial distribution mapping. For this purpose, forty-eight groundwater samples were collected from dug wells, tube wells, and hand pumps of sixteen villages andanalyzed for physicochemical parameters. The XY coordinates of the sample’s sourcesweremarked by Magellan Triton 1500 handheld global positioning system (GPS). The results were compared with WHO and Pak-EPAguidelines. The results of the majority of selected parameters were found within the WHO and Pak-EPA guidelines; however, in certain areas the concentration of total dissolved solids (TDS), chlorides(Cl−), and alkalinity were higher than the guideline limits. Based on cumulative water quality the excellent water quality prevails over an area of 376 km2(21% of district area), good water quality 726 km2(42%), poor 424 km2(24%), very poor 116 km2(6%), and unfit for drinking 84 km2(4%). The water of the Nizampur and Rashaki areas were categorized unfit for drinking. The groundwater quality of nearly one-half of the district varies from poor to very poor, and the soil type and vadose zone sediment/material was found the key reason for groundwater contamination. Based on the infiltration capacity of vadose zone material, the study area was divided into four water pollution vulnerable zones. The low vulnerable zone covers an area of 104 km2, moderate 862 km2, high 667 km2,and very high 93 km2. The most important factor which determines the vulnerability of the groundwater to contamination is the vadose zone material/sediment which in turn determines the soil infiltration capacity. The generated groundwater susceptibility and water quality maps provide critical information for identifying optimal locations for supply wells. © 2022, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

语种： 英文

作者： Lei, Ming;Li, Zhuoqing;Zhang, Beibei;Wang, Xinqi;Tie, Boqing;...

期刊： Adsorption Science & Technology,2022年2022 ISSN：0263-6174

通讯作者： Wang, Xinqi(xinqiwang@hunau.edu.cn)

作者机构： [Ayaz, Tehreem; Zhang, Beibei; Tie, Boqing; Wang, Xinqi; Lei, Ming; Li, Zhuoqing; Lu, Xia] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Lu, Xia] Shenzhen Polytech, Sch Art & Design, Shenzhen 518055, Peoples R China.

通讯机构： [Wang, X.] C;College of Resource and Environment, China

摘要： Lime and biochar amendments are widely used to immobilize cadmium (Cd) in agricultural soils and to ensure food security. However, the effects of these two soil amendments on the mechanisms of Cd stress alleviation in crops are unclear. Therefore, the effects of lime and biochar applications on Cd uptake, transport, subcellular distribution, antioxidant system, N metabolism, and related factors were examined in a soil-Brassica napus L. (B. napus) system. We found that lime application significantly increased the root Cd content by 41.5% but decreased Cd TF and shoot Cd by 81.0% and 74.3%, respectively, whereas biochar amendment decreased root and shoot Cd contents by 67.6% and 34.3%, respectively, but increased Cd TF by 104.1%. Lime treatment immobilized Cd in the cell wall of the root to reduce Cd transport, but biochar treatment increased the soluble fraction of Cd in root cells to improve the migration capacity of Cd. The significant negative relationship between the soil exchangeable Cd and Ca and the positive relationships between Cd and Ca both in shoot and root indicated that the Ca mediated Cd transport from soil to B. napus after lime and biochar applications. Additionally, lime amendment increased Cd proportion in the root cell walls to immobilize Cd, but biochar amendment increased Cd proportion in the soluble fraction to enhance Cd migration. Furthermore, biochar application significantly increased SOD, CAT, and POD by 17.5%, 95.4%, and 26.6%, whereas lime amendment only significantly enhanced CAT by 51.0%. Besides, both of biochar and lime applications increased shoot N content and GDH activity, but only the shoot NO3- content and nitrate reductase under biochar treatment were significantly altered. Overall, these findings suggested that lime is more efficient in reducing the transport of Cd from underground to aboveground and in improving Cd tolerance, whereas biochar tends to improve the antioxidant capacity and facilitate N metabolism. These results will provide significant strategies for selecting appropriate amendments to ensure the crops safety. © 2022 Ming Lei et al.

语种： 英文

作者： Wang, Xinqi;Wu, Xiuwen;Zhang, Beibei;Li, Zhuoqing;Du, Huihui;...

期刊： Journal of Soils and Sediments,2022年22(2):443-456 ISSN：1439-0108

通讯作者： Lei, Ming

作者机构： [Zhang, Beibei; Du, Huihui; Tie, Boqing; Wang, Xinqi; Li, Zhuoqing; Lei, Ming] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Wu, Xiuwen] Qingdao Agr Univ, Coll Resource & Environm, Qingdao 266109, Peoples R China.

通讯机构： [Lei, Ming] H;Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.

关键词： agricultural soil;bacterium;biochar;cadmium;enzyme activity;lime;soil amendment;soil pollution;soil quality;soil remediation;species diversity;stoichiometry

摘要： Purpose: Microbial exoenzyme activity (EEA) and stoichiometry (EES) are of great significance to soil health through their influence on carbon (C), nitrogen (N), and phosphorus (P) cycling. However, when agricultural soil is contaminated by cadmium (Cd), the underlying mechanisms and effects on EEA and EES are still poorly understood. Materials and methods: Here, we examine the effect of different remediation treatments (no amendment, 0.3% lime application, and 1.0% biochar application) on EEA and EES and the driving factors in a Cd-contaminated Brassica napus soil. Results and discussion: The activities of a C-acquiring enzyme (β-1,4-glucosidase), N-acquiring enzymes (β-N-acetyl-glucosaminidase, leucine aminopeptidase, urease, and protease), and a P-acquiring enzyme (acid phosphatase), together with related environmental factors (soil pH and different Cd fractions), substrate factors (soil organic C, total N, and P content), and biotic factors (bacterial diversity and community composition) were analyzed. We found that lime and biochar amendments both significantly reduced EEA (normalized by the microbial biomass C), indicating lower microbial investment in exoenzyme production after remediation. Only lime amendment resulted in greater exoenzyme C:P and N:P ratios, and biochar application did not significantly affect EES. Among all the factors, the relative abundance of Acidobacteria and the bacterial Chao index, rather than available Cd content, accounted for the largest variations in soil EEA and EES, respectively. Additionally, the shoot Cd significantly decreased while the N and P content significantly increased after lime and biochar amendments. The higher shoot N content significantly associated with lower EEA and EES, suggesting that the rapeseed might modulate the microbial community and then the function based on nutrient status. Conclusions: Our results suggest that lime and biochar applications in mild Cd-contaminated soil tend to affect extracellular enzymes indirectly by mediating bacterial diversity, which may also be modulated by plant nutrient status. These results will provide useful information for Cd remediation and maintaining the sustainability of soil ecosystem services. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： Lu, Lei;Rao, Wenkai;Song, Yuyan;Lei, Ming;Tie, Boqing;...

期刊： Environmental Research,2022年205(PB):112571 ISSN：0013-9351

通讯作者： Du, Huihui

作者机构： [Rao, Wenkai; Tie, Boqing; Du, Huihui; Song, Yuyan; Lei, Ming; Lu, Lei] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

通讯机构： [Du, Huihui] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

关键词： *Al (hydr)oxide;*DOM;*Polytungstate species;*Surface complexes;*Tungsten

摘要： Tungsten (W) is a contaminant with health implications whose environmental behaviors are not understood well. Sorption to mineral surfaces is one of the primary processes controlling the mobility and fate of W in soils, sediments, and aquifers. However, few papers published hitherto have not yet figured out the influences of dissolved organic matter (DOM) on this process. Here, we examine W(VI) adsorption behaviors onto Al (hydr)oxide (AAH) in the presence or absence of DOM derived from plant rhizosphere, using batch experiments coupled with X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The morphology and functional group analyses results show that DOM can facilitate the aggregation of AAH and block surface Al-OH groups. Coexisting DOM inhibits W(VI) adsorption onto AAH at acidic to neutral pH (4-7), and the presence of either Na(+)or PO(4)(3-) can exert a completely different impact on W(VI) adsorption. XPS and FTIR characterizations further demonstrate surface W complexes with the Al-OH groups of AAH and carboxyl groups of DOM. There is no reduction of W(VI) during the adsorption processes, and poly-tungstate species are formed on the surface of both AAH and AAH-DOM coprecipitates. This study provides the first evidence of the roles of natural DOM on W sequestration at the mineral-water surface, which has an important implication for the prediction of the migration and bioavailability of W in natural environments.

语种： 英文

作者： Zelin Xu;Xin Liu;Jincheng Peng;Chenchen Qu;Yifan Chen;...

期刊： Carbon Research,2022年1(1):1-12 ISSN：2731-6696

通讯作者： Huihui Du

作者机构： [Xin Liu; Jincheng Peng; Ming Lei; Boqing Tie; Huihui Du] College of Resources and Environment, Hunan Agricultural University, Changsha, China;[Yifan Chen] College of Environmental Science and Engineering, Tongji University, Shanghai, China;[Chenchen Qu; Ming Zhang; Ding Liang] College of Resources of Environment, Huazhong Agricultural University, Wuhan, China;[Zelin Xu] College of Resources and Environment, Hunan Agricultural University, Changsha, China<&wdkj&>College of Environmental Science and Engineering, Tongji University, Shanghai, China

通讯机构： [Huihui Du] C;College of Resources and Environment, Hunan Agricultural University, Changsha, China

关键词： Tungsten;Dissolved organic matter;Biogeochemical cycling;Complexation;Redox;Binding thermodynamics

摘要： Tungsten (W) is an emerging contaminant whose environmental behaviors remain rather sketchy, narrow, and fragmentary. The mobility and fate of W in the aquatic environments may be influenced by naturally dissolved organic matter (DOM), nevertheless, no studies have addressed how W is bound to DOM. In this study, complexation behaviors and mechanisms of W(VI) with representative DOM, humic acid (HA) and fulvic acid (FA), were examined by batch adsorption, spectrometry, and isothermal titration calorimetry (ITC) under environmentally-relevant conditions. A higher W(VI) binding was observed at a lower pH. Compared to HA, FA showed a higher W(VI) complexing capability owing to the presence of more carboxylic groups. As shown in ITC, the carboxylic–W interaction was an endothermic process and driven by entropy, whereas the phenolic–W association was exothermic and driven by both entropy and enthalpy. The redox-active moieties within HA/FA molecules could reduce W(VI) to lower valence states species, predominantly W(V). The presence of Ca2+ not only promoted W–HA/FA complexation but also hindered W(VI) reduction. All in all, the role of dissolved organic matter in the complexation of W(VI) in the aquatic environments merits close attention. • W–humic substances complexation involved ligand exchange on carboxylic/phenolic sites. • Humic/fulvic acid could reduce W(VI) to W(V), while Ca2+ hindered W(VI) reduction. • W–humic substances interaction may greatly affect W’s mobility in aquifers.

语种： 英文

作者： Wang, Xinqi;Lu, Xia;Yi, Xingyun;Li, Zhuoqing;Zhou, Yimin;...

期刊： Journal of Soils and Sediments,2021年21(3):1408-1419 ISSN：1439-0108

通讯作者： Lei, Ming

作者机构： [Wang, Xinqi; Li, Zhuoqing; Lei, Ming; Zhou, Yimin; Lu, Xia] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Duan, Guilan; Yi, Xingyun] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China.;[Duan, Guilan; Yi, Xingyun] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.

通讯机构： [Lei, Ming] H;Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.

关键词： agricultural land;cadmium;contaminated land;fallow;fungus;microbial activity;microbial community;nutrient availability;paddy farming;paddy field;soil microorganism;soil nutrient;soil pollution;species diversity;Acidobacteria;Alphaproteobacteria;Archaea;Bacteria (microorganisms);Betaproteobacteria;Chloroflexi

摘要： Purpose: Fallowing is an improvement process aimed at promoting the soil health and the sustainability of cultivated land. How it affects the soil health-related abiotic properties and microbial community composition under different levels of cadmium (Cd) contamination is not well known. Materials and methods: This study involved applying consistent fallowing practices to paddy soils of low and high Cd content, in order to examine changes in the soil Cd, nutrient, and microbial community using a high-throughput sequencing method. Results and discussion: Fallowing significantly decreased available Cd and phosphorus (P) content, but increased ammonium nitrogen (N) on lightly contaminated plots, whereas only P variables changed significantly for heavily contaminated plots. Furthermore, fallowing significantly decreased bacterial Shannon diversity on lightly contaminated plots and altered bacterial community composition on heavily contaminated plots, but it had no impact on archaeal or fungal communities, indicating that bacteria are more sensitive to fallowing than archaea and fungi. Specifically, fallowing significantly promoted some copiotrophic bacteria (Alphaproteobacteria and Betaproteobacteria) but suppressed some oligotrophic taxa (Chloroflexi phylum and OTU5837 belonging to the phylum Acidobacteria) on highly contaminated plots. Interestingly, the soil microbial community in the lightly contaminated plots was mainly affected by soil pH, C, and N properties, whereas on heavily contaminated plots, it was largely influenced by soil Cd and P variables. Conclusions: Overall, these findings showed that fallowing significantly improved soil N availability but decreased Cd availability in lightly contaminated conditions, while shifts in microbial community composition under heavily contaminated conditions may indirectly enhance soil nutrient availability and reduce available Cd. These findings highlight the significance of fallowing to promote the health and the sustainability of Cd-contaminated cultivated land. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.

语种： 英文

作者： Jiang, Jinfeng;Ayaz, Tehreem;Jiang, Zhanru;Lei, Ming*

期刊： IOP Conference Series: Earth and Environmental Science,2021年632(5):052079 ISSN：1755-1307

通讯作者： Lei, Ming

作者机构： [Ayaz, Tehreem; Jiang, Jinfeng; Lei, Ming; Jiang, Zhanru] Hunan Agr Univ, Coll Resource & Environm, Changsha, Peoples R China.

通讯机构： [Lei, Ming] H;Hunan Agr Univ, Coll Resource & Environm, Changsha, Peoples R China.

会议名称： Asia Conference on Geological Research and Environmental Technology (GRET)

会议时间： OCT 10-11, 2020

会议地点： ELECTR NETWORK

会议主办单位： [Jiang, Jinfeng;Ayaz, Tehreem;Jiang, Zhanru;Lei, Ming] Hunan Agr Univ, Coll Resource & Environm, Changsha, Peoples R China.

会议论文集名称： IOP Conference Series-Earth and Environmental Science

关键词： Chemicals removal (water treatment);Environmental technology;Geology;Heavy metals;Soil pollution;Soils;Water pollution;Contaminated water;Environmental pollutions;Existing problems;Modified clays;Natural clay minerals;Natural minerals;Polluted water;Clay minerals

摘要： Among all natural minerals, the natural clay mineral has been widely used for environmental pollution treatment both in water and soil, especially heavy metal (HM) pollution in recent years. In this review, modified methods for clay minerals and their application for the remediation of HM contaminated water and soil are summarized. The remediation mechanisms of HMs in water and in soil by modified clay minerals were discussed. Moreover, the existing problems and development of clay minerals are also discussed. © 2021 Institute of Physics Publishing. All rights reserved.

语种： 英文

作者： Nasir, Muhammad Jamal;Khan, Sajjad;Ayaz, Tehreem;Khan, Amir Zeb;Ahmad, Waqas;...

期刊： Environmental Earth Sciences,2021年80(13):1-13 ISSN：1866-6280

通讯作者： Ayaz, Tehreem(tehreemayaz17301@yahoo.com)

作者机构： [Nasir, Muhammad Jamal; Khan, Sajjad] Univ Peshawar, Dept Geog, Peshawar 25120, Pakistan.;[Ayaz, Tehreem; Lei, Ming] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Khan, Amir Zeb] Pak Austria Fachhochhule, Inst Appl Sci & Technol, Mang 22620, Haripur, Pakistan.;[Ahmad, Waqas] Natl Univ Sci & Technol NUST, Inst Geog Informat Syst IGIS, Islamabad 44000, Pakistan.

通讯机构： [Tehreem Ayaz] C;College of Resource and Environment, Hunan Agricultural University, Changsha, People’s Republic of China

关键词： Groundwater potentiality;Remote Sensing (RS);Geographical Information Systems (GIS);Weighted overlay;Multi-influencing Factor (MIF) approach

摘要： This study evaluated the spatial distribution of groundwater potential zones in Kabul Province, Afghanistan using the geospatial multi-influencing factor approach. The influencing parameters employed for the assessment of groundwater potential zones were land slope, geology, soil type, land use/land cover, lineament density, rainfall, and drainage density. The subclasses within each influencing parameter were subdivided based on their influence on groundwater potential as major, minor, and no effect, and were subsequently assigned a score value. The combined score value of these parameters was used for calculating their relative weights. The delineated groundwater potential zones were classified in four groups, i.e., poor, moderate, good, and very good. The study results revealed that zones with a very good groundwater potential covered an area of 355 km2 (2% of the total area), good 1524 km2 (20%), moderate 2251 km2 (73%), and poor 477 km2 (5%). The study concluded that the geospatial-assisted multi-influencing factor approach was very useful and efficient technique for the assessment of groundwater potential zones and can be effectively employed to enhance the conceptual understanding of groundwater resources of Kabul Basin, Afghanistan. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： 杜辉辉;陶洁;聂宁;雷鸣;杨蕊嘉;...

期刊： 土壤学报,2021年58(3):704-711 ISSN：0564-3929

作者机构： 湖南农业大学资源环境学院,湖南省灌溉水源水质污染净化工程技术研究中心,长沙 410128;[雷鸣; 杜辉辉; 聂宁; 陶洁; 杨蕊嘉; 铁柏清] 湖南农业大学

关键词： 锑;土壤胶体;矿物–微生物互作;吸附;氧化还原

摘要： 锑(Sb)在土壤胶体微界面的吸附解吸深刻影响其迁移、转化和归趋。土壤矿物、有机物、微生物等胶体组分多结合在一起,形成复杂的矿物–有机复合体。目前,锑在单一土壤组分上的吸附研究颇多,但较少有学者关注锑在土壤矿物–有机复合胶体界面的吸附过程和机制。通过宏观吸附以及光谱学技术探究锑在典型铝氧化物–细菌复合胶体上的吸附行为,结果表明:α-Al_(2)O_(3)纳米级颗粒覆盖在蜡状芽孢杆菌表面,形成一层不完整的\"矿物膜\"。朗格缪尔(Langmuir)模型可以很好地拟合Sb(Ⅴ,Ⅲ)的等温吸附数据(R^(2)>0.98);α-Al_(2)O_(3)对Sb的吸附量远大于细菌;Sb在Al_(2)O_(3)–细菌复合胶体上的吸附不符合\"组分相加\"原则,存在显著的促进效应。扫描电镜-能谱分析显示Sb主要结合在复合胶体的矿物组分上。X-射线光电子能谱结果表明铝羟基、羧基和氨基参与了Sb的吸附,且细菌会抑制Sb(Ⅲ)在α-Al_(2)O_(3)表面的氧化。本研究证实,细菌不仅影响锑在矿物界面的吸附量,还影响其氧化还原反应,因此,在预测锑在土壤中的形态转化、迁移和归趋时必须考虑矿物–微生物相互作用。

语种： 中文

作者： Gong, Liang;Wang, Jie;Jiang, Chenhao;Xiao, Teng;Shen, Kang;...

期刊： ChemistrySelect,2021年6(13):3174-3182 ISSN：2365-6549

通讯作者： Lei, M.;Tang, Y.

作者机构： [Gong, Liang] Zhejiang Univ Technol, Lab & Assets Management Dept, Hangzhou 310014, Peoples R China.;[Tang, Yiping; Jiang, Chenhao; Xiao, Teng; Shen, Kang; Wang, Jie] Zhejiang Univ Technol, Coll Mat Sci & Engn, Hangzhou 310014, Peoples R China.;[Lei, Ming] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.

通讯机构： [Prof. Ming Lei; Prof. Yiping Tang] C;College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, 310014 China<&wdkj&>College of Resource and Environment, Hunan Agricultural University, Changsha, 410128 China

关键词： Adsorption;desorption;magnetic;malachite green;mesoporous

摘要： <jats:title>Abstract</jats:title><jats:p>In this paper, a novel adsorbent of magnetic mesoporous carbon microspheres (MCS) are prepared by template methods and using nano‐Fe<jats:sub>3</jats:sub>O<jats:sub>4</jats:sub> particles as magnetic cores, and the adsorption capacity and mechanism are studied in detail. The results show that MCS exhibits high performance for removing malachite green (MG), the highest adsorption capacity can reach about 468.5 mg g<jats:sup>−1</jats:sup>. Furthermore, the Langmuir adsorption isotherm model and the quasi‐second‐order kinetic model can explain the experimental phenomena very well. And the high adsorption capacity of MCS is mainly attributed to its unique mesoporous structure by increasing the specific surface area and providing sufficient active sites. In addition, after magnetic separation and recovery, MCS can be regenerated with ethanol. And MCS maintains a high adsorption rate of 84.5 % after 5 cycles of MG adsorption and desorption. This composite material with high adsorption efficiency and rapid magnetic separation is a promising recyclable adsorbent for the actual wastewater treatment and purification process.</jats:p>

语种： 英文

作者： Wang, Xinqi;Deng, Sihan;Zhou, Yimin;Long, Jiumei;Ding, Dan;...

期刊： Environmental Science and Pollution Research,2021年28(7):7828-7839 ISSN：0944-1344

通讯作者： Lei, Ming

作者机构： [Long, Jiumei; Du, HuiHui; Tie, Bai Qing; Wang, Xinqi; Ding, Dan; Chen, Congying; Deng, Sihan; Lei, Ming; Zhou, Yimin] Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.;[Long, Jiumei] Hengyang Normal Univ, Coll Environm & Life Sci, Hengyang 421001, Peoples R China.

通讯机构： [Lei, Ming] H;Hunan Agr Univ, Coll Resource & Environm, Changsha 410128, Peoples R China.

关键词： Foliar application;Iron fertilization;Chelated iron;Photosynthesis;Antioxidant enzyme;Cadmium accumulation

摘要： Iron (Fe) fertilizer can reduce cadmium (Cd) uptake and toxicity in rice, but the underlying mechanisms of Cd mitigation by different fertilizers are poorly understood. Here, pot experiments in rice were conducted to characterize the effects of four types of foliar-applied Fe fertilizer (chelated ferrous Fe, ferric Fe, ionic ferrous Fe, and ferric Fe) at three doses (20, 50, and 100mgL−1) on photosynthetic capacity, antioxidant ability, yield, and Cd accumulation in Cd-contaminated soil. The results showed that foliar Fe application increased the net photosynthesis rate by 19.3%, peroxidase (POD) by 18.2%, superoxide dismutase (SOD) by 26.9%, and catalase (CAT) by 19.6%, and led to a 7.2% increase in grain yield compared with the control. Moreover, foliar Fe application significantly reduced Cd accumulation by 15.9% in brown rice and decreased the translocation of Cd from roots to other plant tissues. Overall, application of moderate doses (50mgL−1) of chelated ferrous Fe was the most effective method for reducing Cd uptake (decreasing the Cd concentration in brown rice by 29.0%) and toxicity in rice (decreasing malondialdehyde by 23.2% and increasing POD, SOD, and CAT by 54.4%, 51.6%, and 45.7%, respectively), which may stem from the fact that chelated ferrous Fe was a more stable and bioavailable source of Fe for rice. The Cd concentration in rice had negative relationship with Fe concentration, and the translocation of Cd from root to the other tissues was reduced by the higher Fe nutrition status in leaf, suggesting that a high Fe supply may decrease Cd content by inhibiting the expression of the Fe transport system. These results indicate that foliar application of chelated ferrous Fe provides a promising alternative approach for enhancing growth and controlling Cd accumulation in rice plants. Furthermore, these results advance our understanding of the associations between plant Fe nutrition status and Cd accumulation. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： 江晨浩;王杰;龚亮;沈康;雷鸣;...

期刊： 中南大学学报(自然科学版),2021年52(5):1446-1455 ISSN：1672-7207

通讯作者： Tang, Yiping(tangyiping@zjut.edu.cn)

作者机构： [江晨浩; 王杰; 沈康; 唐谊平] College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou;310014, China;[龚亮] Laboratory and Assets Management Department, Zhejiang University of Technology, Hangzhou;[雷鸣] College of Resource and Environment, Hunan Agricultural University, Changsha;410128, China

关键词： 磁性;蟹壳;孔雀石绿(MG);循环再生

摘要： 对废弃蟹壳进行活化和碳化处理,采用共沉淀的方法将Fe3O4附载到蟹壳炭上,制备磁性蟹壳活性炭（MAC）,并探究其对染料孔雀石绿（MG）的吸附性能和机理。研究结果表明:MAC去除水溶液中的MG时具有1 876.58 mg/g的最大吸附容量,实验结果与Langmuir吸附等温模型和准二级动力学模型拟合结果高度吻合。MAC的高吸附容量主要归因于活化过程创造的大量微米级孔洞以及蟹壳本身去除碳酸盐后的生物结构,提供了充足的活性位点。磁性分离回收后,MAC可以用无水乙醇脱附再生。经过5次MG吸附脱附循环,MAC保持84.6%的高吸附率。对于废弃物的二次利用和实际的废水处理而言,MAC具有高吸附效率和快速磁分离性能,是一种极具前景的生物质可回收吸附剂。

语种： 中文

作者： 周一敏;黄雅媛;刘晓月;李冰玉;刘羽翼;...

期刊： 环境科学,2021年42(2):932-940 ISSN：0250-3301

通讯作者： Lei, Ming(leiming8297@163.com)

作者机构： [周一敏; 黄雅媛; 李冰玉; 李卓晴; 王薪琪; 雷鸣] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;[刘晓月] Aerospace Kaitian Environmental Technology Co., Ltd., Changsha;410100, China;[刘羽翼] Hunan Breath Environment Technology Co., Ltd., Changsha

关键词： 水稻;镉;富集;叶面喷施;纳米MnO2

摘要： 镉( Cd)容易被水稻富集,从而造成稻米中Cd含量超标,严重威胁人类健康.锰( Mn)是植物必需元素,为了探究叶面喷施纳米MnO_2对水稻富集Cd的影响机制,本研究在酸性Cd污染土壤上进行田间小区试验,在水稻抽穗早期叶面喷施0.1%、 0.3%和0.5%的纳米MnO_2溶液.结果表明与对照组相比,叶面喷施不同浓度的纳米MnO_2可以有效降低水稻叶、壳和糙米中的Cd含量,增加所有部位的Mn含量,但对水稻的产量影响不大.叶面喷施纳米MnO_2后,提高了叶片光合作用效果,抑制了叶片脂质过氧化,增加了氧化应激酶的含量,从而缓解Cd对水稻的胁迫.此外,叶面喷施纳米MnO_2增加了水稻根表铁锰胶膜的含量,强化了铁锰胶膜对Cd的吸附/共沉淀作用,从而限制水稻根系吸收Cd.因此,在水稻抽穗早期叶面喷施纳米MnO_2是一种增加糙米中Mn含量和减少Cd含量的有效措施.

语种： 中文

作者： Du, Huihui;Nie, Ning;Rao, Wenkai;Lu, Lei;Lei, Ming;...

期刊： Environmental Pollution,2021年290:118040 ISSN：0269-7491

通讯作者： Huihui Du

作者机构： [Rao, Wenkai; Nie, Ning; Du, Huihui; Tie, Boqing; Lei, Ming; Lu, Lei] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.

通讯机构： [Huihui Du] C;College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, People's Republic of China

关键词： Arsenic;Bacteria;Cadmium;Coadsorption;Ferrihydrite;Humic acid

摘要： Organomineral assemblages are building units of soil micro-aggregates and exert their essential roles in immobilizing toxic elements. Currently, our knowledge of the adsorption and partitioning behaviors of coexisting Cd–As onto organomineral composites is limited. Herein, we carefully studied Cd–As cosorption onto ferrihydrite organomineral composites made with either living or non-living organics, i.e., bacteria (Delftia sp.) or humic acid (HA), using batch adsorption and various spectroscopies. Batch results show that As(V) only enhances Cd(II) sorption on pure Fh at pH &lt; 6 but cannot promote Cd(II) sorption to Fh–organo composites. However, Cd(II) noticeably promotes As(V) sorption at pH&gt;~5–6. Synchrotron micro X-ray fluorescence indicates that Cd(II) adsorbs predominately to the bacterial fraction (Cd versus P, r = 0.924), whereas As(V) binds mainly to the Fh fraction (As versus Fe, r = 0.844) of the Fh–bacteria composite. On Fh–HA composite, however, Cd(II) and As(V) are both primarily sorbed by the Fh fraction (Cd/As versus P, r &gt; 0.8), based on the scanning transmission electron microscopy-energy disperse spectroscopy analyses. Elemental distribution characterization also manifests the co-localization of Cd(II) and As(V) within the organomineral composite, particular in Fh–HA composite (Cd versus As, r = 0.8), which is further identified as the Fh–As–Cd ternary complex based on the observations (higher frequencies at ~753–761 cm−1) of attenuated total reflection Fourier-transform infrared spectroscopy. Moreover, this ternary interaction is more pronounced in Fh–HA than in Fh–bacteria. In summary, our results suggest that Cd–As coadsorption behaviors on Fh–organo composites are different from those on pure minerals, and the presence of bacteria/HA can significantly affect metal (loid)s speciation, distribution, and ternary interaction. Therefore organomineral composites are a more suitable analog than pure mineral phases to predict the mobility and fate of Cd–As in natural environments. © 2021 Elsevier Ltd

语种： 英文

作者： 雷鸣;丁丹;蒋金凤;李冰玉;谭迪;...

期刊： 湖南农业大学学报(自然科学版),2021年47(4):482-486 ISSN：1007-1032

作者机构： 湖南农业大学资源环境学院,湖南 长沙 410128;[雷鸣; 李冰玉; 丁丹; 谭迪; 邓思涵; 蒋金凤] 湖南农业大学

关键词： 水稻;洛克沙胂;固相萃取;高效液相色谱;提取剂;淋洗液;洗脱剂;流动相

摘要： 通过对超声提取法中提取剂、固相萃取中淋洗液和洗脱剂、高效液相色谱中流动相的筛选,建立固相萃取–高效液相色谱定量检测水稻中洛克沙胂的方法。所建方法为:样品先经0.05 mol/L NaOH+20 g/L K_2HPO_4超声提取;再利用活化后的固相萃取小柱,依次采用1.5 mL 0.05 mol/L乙酸钠–甲醇溶液(pH=7)和1.5 mL甲醇淋洗及体积分数为13%的甲酸–甲醇溶液洗脱;最后利用以含0.3%甲酸的0.05 mol/L磷酸二氢钾溶液和甲醇(体积比80∶ 20)为流动相的高效液相色谱进行定量分析;该方法在洛克沙胂质量浓度为0.01~10.00 mg/mL时线性关系良好,相关系数大于0.999,检测限和定量限分别为20、67 ng/kg;洛克沙胂在水稻根、茎、叶、壳、米中的加标回收率分别为80.0%~87.2%、74.0%~80.6%、80.0%~83.7%、81.0%~90.0%和83.2%~92.7%,相对标准偏差分别为2.2%~5.9%、2.4%~4.6%、2.0%~2.6%、3.6%~5.7%和3.2%~5.5%。

语种： 中文

作者： Du, Huihui;Tao, Jie;Yang, Ruijia;Lei, Ming*;Tie, Boqing;...

期刊： Journal of Soils and Sediments,2020年20(5):2418-2425 ISSN：1439-0108

通讯作者： Lei, Ming

作者机构： [Tao, Jie; Nie, Ning; Xu, Zelin; Du, Huihui; Tie, Boqing; Hu, Meng; Lei, Ming; Liu, Xin; Yang, Ruijia] Hunan Agr Univ, Coll Resources & Environm, Hunan Engn & Technol Res Ctr Irrigat Water Purifi, Changsha 410128, Peoples R China.;[Tao, Jie; Nie, Ning; Xu, Zelin; Du, Huihui; Tie, Boqing; Hu, Meng; Lei, Ming; Liu, Xin; Yang, Ruijia] Minist Agr, Key Lab Southern Farmland Pollut Prevent & Contro, Changsha 410128, Peoples R China.

通讯机构： [Lei, Ming] H;[Lei, Ming] M;Hunan Agr Univ, Coll Resources & Environm, Hunan Engn & Technol Res Ctr Irrigat Water Purifi, Changsha 410128, Peoples R China.;Minist Agr, Key Lab Southern Farmland Pollut Prevent & Contro, Changsha 410128, Peoples R China.

关键词： adsorption;antimony;bacterium;birnessite;detection method;manganese oxide;oxidation;toxicity;Bacillus cereus;Bacteria (microorganisms)

摘要： Purpose: The adsorption-oxidation of Sb on manganese oxide plays an important role in controlling Sb mobility and fate in soils and sediments. Widespread organic substances such as microbes may greatly affect this process, and deserve a careful investigation. This study examines the adsorption and oxidation of Sb(III, V) on birnessite, a typical manganese oxide, with and without Bacillus cereus cells. Materials and methods: Adsorption isotherms were conducted to explore the adsorption capacity of Sb to the birnessite–bacteria composite. X-ray photoelectron spectroscopy (XPS) was applied to determine the valence state of Mn and the adsorbed Sb species. Results and discussion: The SEM results show that birnessite adheres to the outer surface of bacterial cells, and the aggregation of minerals occurs to a lesser extent in the presence of cells. Batch adsorption results show a much larger Sb adsorption on individual birnessite than on bacteria, and the measured Sb adsorption to the birnessite–bacteria composite is larger than that predicted assuming additive, i.e., the sum of the end-member metal adsorptivities. On birnessite, Sb(III) is predominately oxidized to Sb(V) according to the XPS analysis, and the presence of bacteria hinders this oxidation reaction. Conclusions: We propose that microbe−birnessite association favors the immobilization of Sb on solid phases, but can inhibit the oxidation of Sb(III) to Sb(V), which is of great significance for evaluating the toxicity, bio-availability, and mobility of Sb in both natural and contaminated environments. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文