作者机构：
[Yang, Guang; Duan, Guilan; Cao, Jinman] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China.;[Lin, Aijun; Cao, Jinman] Beijing Univ Chem Technol, Coll Chem Engn, Beijing 100029, Peoples R China.;[Duan, Guilan] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[You, Siming] Univ Glasgow, James Watt Sch Engn, Glasgow G128QQ, Scotland.
通讯机构：
[Guang Yang] S;State Key Lab of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
关键词：
Cu;Fermentative hydrogen production;Inhibition;Metagenomic analysis;Microbial community structure
摘要：
Cu is widely present in the feedstocks of dark fermentation, which can inhibit H2 production efficiency of the process. However, current understanding on the inhibitory mechanisms of Cu, especially the microbiological mechanism, is still lacking. This study investigated the inhibitory mechanisms of Cu2+ on fermentative hydrogen production by metagenomics sequencing. Results showed that the exposure to Cu2+ reduced the abundances of high-yielding hydrogen-producing genera (e.g. Clostridium sensu stricto), and remarkably down-regulated the genes involved in substrate membrane transport (e.g., gtsA, gtsB and gtsC), glycolysis (e.g. PK, ppgK and pgi-pmi), and hydrogen formation (e.g. pflA, fdoG, por and E1.12.7.2), leading to significant inhibition on the process performances. The H2 yield was reduced from 1.49 mol H2/mol-glucose to 0.59 and 0.05 mol H2/mol-glucose upon exposure to 500 and 1000 mg/L of Cu2+, respectively. High concentrations of Cu2+ also reduced the rate of H2 production and prolonged the H2-producing lag phase.
通讯机构：
[Yan-Hong Wang; Ji-Hui Wen] E;Ecology Department, College of Resources and Environment, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha, 410128, China<&wdkj&>School of Forestry and Bio-technology, Zhejiang Agriculture & Forestry University, Hangzhou, 311300, China<&wdkj&>Ecology Department, College of Resources and Environment, Hunan Provincial Key Laboratory of Rural Ecosystem Health in Dongting Lake Area, Hunan Agricultural University, Changsha, 410128, China<&wdkj&>Institute of Plant Protection, Hunan Academy of Agricultural Sciences, Changsha, 410125, China
关键词：
Autotoxicity;Bacterium;Detoxification;Invasion;Advantage;Release;Decline;Over time
摘要：
Plant invasive success is attributed to invaders' ecological advantages over their native neighbors. However, increasing evidence suggests that these advantages are expected to attenuate over time because of natural enemy accumulation, ecological evolution of native species and autotoxicity. We determined how an invasive Ageratina adenophora could remain its competitive advantages over time by avoiding its autotoxicity. Our results highlighted that the autotoxicity of A. adenophora in its invaded soil was reduced by some microbes. Moreover, an autotoxic alle-lochemical, 2-coumaric acid glucoside, detected in the invaded soil, demonstrated distinctly autotoxic effects on its seed germination and seedling growth. However, the autotoxic effects were greatly alleviated by a bacterium Bacillus cereus, accumulated by A. adenophora. Further-more, the allelochemical could be almost completely degraded by B. cereus within 96 h. Accordingly, we speculate that A. adenophora could aggregate B. cereus to release its autotoxicity maintaining its competitive advantages over time.
期刊：
Science of The Total Environment,2023年859(Pt 1):160215 ISSN：0048-9697
通讯作者：
Lifeng Zhu
作者机构：
[Hu, Ting; Jiang, Shuyu; Zhu, Lifeng; Zhao, Wenqian] Nanjing Normal Univ, Coll Life Sci, Nanjing 210046, Peoples R China.;[Hu, Ting; Wang, Jianjun; Jiang, Shuyu; Hu, Ang; Zhao, Wenqian] Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, Nanjing 210008, Peoples R China.;[Wang, Jianjun] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Hu, Ang] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.
通讯机构：
[Lifeng Zhu] C;College of Life Sciences, Nanjing Normal University, Nanjing 210046, China
关键词：
Acidification;Alpha and beta diversity;Biotic homogenization;Environmental recovery;Plankton communities;Spatiotemporal variations
摘要：
Determining biodiversity responses to environmental change, such as acidification, is critical for ecosystem projections under future global change scenarios. Here, we analyzed three plankton communities of phytoplankton, crustaceans and rotifers in 28 lakes in the Adirondack Park, USA, during 1994-2012, and examined the spatiotemporal trends in their alpha and beta diversity during recovery from acidification. For all plankton assemblages, Shannon diversity increased towards recent years and high lake pH, and there was an increasing community dissimilarity with pH changes. The spatial mean Bray-Curtis dissimilarities across all lakes decreased over time for phytoplankton and rotifers leading to an increase in spatial homogenization. Such a homogenization cooccurred however with the overall increasing diversity in this region, which contrasts with the previous classic view that homogenization is mainly driven by loss of species and results in biodiversity loss. We further observed lower temporal mean beta diversity in low-pH lakes for crustaceans and rotifers, but not for phytoplankton. Generally, spatial and temporal mean beta diversity of the three taxonomic groups were primarily driven by lake-water ion variables, and rotifers were also constrained by nutrients and climate. Collectively, our results show how and why plankton community compositions vary over space along with acidification recovery, and further highlight the importance of spatiotemporal studies combined with long-term monitoring programs in assessing biodiversity change during the recovery of disturbed ecosystems.
期刊：
Science of The Total Environment,2023年905:167289 ISSN：0048-9697
通讯作者：
Zhang, X
作者机构：
[Zhang, Xin; Yang, Guang; Li, Jinglong; Chen, Baodong; Xing, Shuping; Fu, Gengxue] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China.;[Zhang, Xin] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Wu, Songlin] Univ Queensland, Sustainable Minerals Inst, Ctr Mined Land Rehabil, Brisbane, Qld 4072, Australia.;[Feng, Haiyan] China Univ Geosci Beijing, Sch Earth Sci & Resources, Beijing 100083, Peoples R China.;[Zhou, Yaoyu] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.
通讯机构：
[Zhang, X ] C;Chinese Acad Sci, Res Ctr Ecoenvironm Sci, 18 Shuangqing Rd, Beijing 100085, Peoples R China.
关键词：
AM fungi;Biochar;Cr tolerance;Plant metabolism;Soil properties
摘要：
Soil chromium (Cr) contamination has become an environmental problem of global concern. However, the joint effects of combined utilization of biochar and arbuscular mycorrhizal (AM) fungal inoculum, which are considered as two promising remediation strategies of soil heavy metal pollutions, on plant Cr resistance are still poorly understood. In this study, a two-factor pot experiment was conducted to investigate how biochar and AM fungus Rhizophagus irregularis regulate Medicago sativa growth, physiological trait, nutrient and Cr uptake, relevant gene expressions, soil properties, and Cr speciation, independently or synergistically. The results showed that biochar notably decreased AM colonization, while biochar and AM fungus could simultaneously increase plant dry biomass. The greatest growth promotion was observed in mycorrhizal shoots at the highest biochar level (50gkg(-1) soil) by 91 times. Both biochar application and AM fungal inoculation enhanced plant photosynthesis and P nutrition, but the promoting effects of AM fungus on them were significantly greater than that of biochar. In addition, the combined application of biochar and AM fungus dramatically reduced shoot and root Cr concentrations by up to 92% and 78%, respectively, compared to the non-amended treatment. Meanwhile, down-regulated expressions were observed for metal chelating-related genes. Furthermore, Cr translocation from roots to shoots was reduced by both two soil amendments. Transcriptional levels of genes involved in reactive oxygen species and proline metabolisms were also regulated by biochar application and AM fungal colonization, leading to alleviation of Cr phytotoxicity. Furthermore, AM fungal inoculation slightly elevated soil pH but decreased plant-available soil P, which was, by contrast, lifted by biochar addition. The combined application reduced soil acid-extractable Cr concentration by 40%. This study provides new insights into comprehensively understanding of the mechanisms of biochar and AM fungi combination on improving plant Cr tolerance.
作者机构：
[Li, Junchun] Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China;[Li, Junchun] Guangdong Key Laboratory of Contaminated Environmental Management and Remediation, Guangdong Provincial Academy of Environmental Science, Guangdong, 510045, China;[Yang, Xiao] Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China. Electronic address: yanxl@igsnrr.ac.cn;[Tong, Xuejiao] Yuhuan Enviromental Technology Co.Ltd, Shijiazhuang, Hebei, 050000, China;[Peng, Yutao] School of Agriculture, Sun Yat-sen University, Shenzhen, Guangdong, 518107, China
通讯机构：
[Xiao Yang; Xiulan Yan] K;Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China
关键词：
Cd accumulation;Intercropping;Potentially toxic elements;Safe production;Sustainable agriculture
摘要：
The utilization of Cd-contaminated soil in vegetable crop production can lighten the food crisis and improve the soil environmental resilience. Intercropping is a reliable technology in safety production from contaminated soil. A field-scale experiment was carried out to unravel how plant species and pattern affect the growth and Cd uptake of Chinese cabbage from Cd contaminated land. Among all the intercropping systems designed in this study, one row of Chinese cabbage intercropping with one row of Solanum nigrum L. is the best planting mode (high yields (2.78kg/m(2)) and low Cd accumulation (0.02mg/kg) of Chinese cabbage). Combined with the in-depth joint analysis of diverse soil physicochemical features (soil nutrient characteristics and microbial community structure), biomass yield and quality, and soil microbiological properties, we elaborated that two measures (screening hyperaccumulation types and controlling planting strip width) were the major factors in determining the growth of the aboveground and underground parts of Chinese cabbage respectively, thus directly regulating the application effectiveness of intercropping technology. The intertwined mechanisms (interspecific and intraspecific relationship) of different intercropping systems are summarized, which include better utilization of space, light and other resources in the aboveground part, bioavailability of nutrient, drive of soil bacteria and alleviated soil Cd stress in the underground part, etc. Our research outputs indicate the effectiveness and feasibility of intercropping can be improved by optimizing the streamline configuration and plant mode, which provide theory of reference and practical evidence for warranting the food safety and agricultural soil remediation simultaneously.
摘要：
Although increasing attention has been paid to agronomic measures for reducing the heavy metal load in rice grain, the effects of duckweed-paddy co-cropping technology on the accumulation of cadmium (Cd) in rice grains remain unclear. To investigate its specific effects on Cd accumulation in paddy fields, three types of duckweed-like hydrophyte (DH), Azolla imbricata, Spirodela polyrrhiza, and Lemna minor were chosen for study. Their use resulted in a reduction of Cd content in rice grains from 0.40mg/kg to <0.20mg/kg, with A. imbricata yielding the best results (0.15mg/kg). The three types of DH reduced the available Cd content in the soil by 10% to 35% after the paddy tillering stage. The reduction of available Cd content was attributed to the absorption, high pH, and increase of relative abundance of special bacteria of immobilizing Cd. In addition, DH could regulate soil nitrogen leading to ammonium nitrogen increased from 75mg/kg to 100mg/kg, while nitrate nitrogen decreased from 0.55 to 0.1-0.3mg/kg. The increase of ammonium nitrogen content might induce the low Cd transfer ability in rice plant and then low Cd content in rice grain. This study demonstrated that DH has a good effect on the reduction of the Cd concentration in rice grains. Consequently, duckweed-paddy co-cropping technology offers a potential solution to heavy metal pollution and agricultural non-point source pollution, as it not only reduces Cd levels in rice plants, but also fixes nitrogen, reducing the need for nitrogen application.
通讯机构：
[Luo, HL ] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;State Environm Protect Key Lab Monitoring Heavy Me, Changsha 410014, Peoples R China.
摘要：
Anodic stripping voltammetry (ASV) is a widely used electrochemical analysis method in rapid detection of heavy metals. But the interference in complex samples will influence the accuracy and sensitivity of electrochemical detection, which further limits ASV on-site application. In this article, main ion interferences, interference mechanisms and available elimination measures in ASV detection of heavy metals are analyzed and summarized. Metal ions, the main disturbances, generally interfere with detection by competing active sites, forming intermetallic compounds or coating on electrode surface. Elimination methods include adding masking agents, adjusting electrolyte composition, changing deposition potentials and using modified electrode. More researches about ion interference appear in electrochemical detection method, the effect verification of electrode materials and adding test rather than actual detection. Furthermore, reliable solution of the interferences in simultaneous detection of multiple components will be the direction of future in-depth research.
通讯机构：
[Li, F ] C;[Li, YZ ] H;Hunan Agr Univ, Coll Resources & Environm, Hunan Prov Key Lab Rural Ecosyst Hlth Dongting Lak, Changsha 410128, Hunan, Peoples R China.;Chinese Acad Sci, Inst Subtrop Agr, 644 Second St Yuanda Rd, Changsha 410125, Peoples R China.
关键词：
Hydrodynamic -water quality model;Water level;Water quality;Lake sluice;Dongting Lake
摘要：
River-connected lakes with floodplain characteristics have substantial effects on terrestrial hydrologic cycles and are highly sensitive to external disturbances; thus, large-scale hydraulic projects are often constructed in such lakes to mitigate problems in the water environment. However, the spatiotemporal dynamics of the water environment in river-connected lakes and the differences in the water environment before and after the hydraulic project operation have received little attention. Here, a well-established coupled hydrodynamic-water quality model was applied to estimate the effects of the Chenglingji Sluice (CS) operation on the hydrodynamic features and water quality of Dongting Lake, a typical river-connected lake in China. The model successfully reproduced the water level and water quality dynamics of Dongting Lake, with a Root Mean Square Error (RMSE) of 0.29-1.24 m for water level and a Mean Relative Error (MRE) of 5.76-10.28% and 6.25-8.14% for total nitrogen (TN) and permanganate index (CODMn), respectively. The spatiotemporal fluctuation of lake water levels was observed over different hydrological periods. Water quality varied considerably spatially, with considerable pollution in East Dongting Lake and the Xiang River inlet. Concentrations of NH3-N (ammonia nitrogen), TN, and total phosphorus (TP) first decreased and then increased during the study period, whereas CODMn concentrations displayed the opposite trend. After the CS operation, the water level increased to 27.11 m and the water surface area increased by 19.29% in the dry period; furthermore, the water quality in the CS operation scenario had low concentrations compared to that of the baseline scenario in the dry period, with concentrations ranging from 0.03 to 0.24 mg/L for TN, 0.001 to 0.015 mg/L for TP, 0.006 to 0.09 mg/L for NH3-N, and 0.02 to 0.22 mg/L for CODM, effectively improving the water environment of Dongting Lake. However, the subsequent reaction of the lake environment to changes in hydrological conditions after the CS operation requires further attention.
通讯机构：
[Pufeng Qin; Zhibin Wu] C;[Hui Wang] D;Department of Chemical Engineering, University College London, London WC1E 7JE, UK<&wdkj&>College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China<&wdkj&>Key Laboratory for Rural Ecosystem Health in the Dongting Lake Area of Hunan Province, Changsha 410128, PR China
摘要：
As a metal-free polymer, graphitic carbon nitride (g-C3N4) has spurred extensive consideration over their inor-ganic counterparts due to the unique physical and chemical properties. However, the low specific surface area, high charge recombination rate and insufficient light absorption limit its application in the field of photo -catalysis. Sulfur doping has been demonstrated as an efficient strategy for to promote light absorption and radiative carrier separation. On the basis of sulfur-doped carbon nitride, many of its modified composites have been synthesized and applied in photocatalysis, and have achieved dazzling results. Here, we introduce the basic properties of sulfur doped carbon nitride and its preparation method, and then discuss the effective method of controlling the introduction of sulfur doped g-C3N4. In addition, the achievement of sulfur doped g-C3N4 for several applications, including water splitting, carbon dioxide reduction, organic compounds degradation, inorganic matter transformation, nitrogen fixation and bacteria disinfection, were comprehensively reviewed. Finally, outstanding challenges and prospective perspectives are discussed, which might provide a new idea for the photocatalysts design for photocatalytic activity improvement.
通讯机构：
[Manyun Zhang] K;Key Laboratory for Rural Ecosystem Health in Dongting Lake Area, College of Resources and Environment, Hunan Agricultural University, Changsha, Hunan 410128, PR China<&wdkj&>Centre for Planetary Health and Food Security, School of Environment and Science, Griffith University, Brisbane, Queensland 4111, Australia
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.
通讯机构：
[Yaocheng Deng; Ying Huang] C;[Chengyang Feng] K;KAUST Catalysis Center, Physical Sciences and Engineering Division, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia<&wdkj&>College of Resources & Environment, Hunan Agricultural University, Changsha 410128, China
