摘要：
In the current work, the effects of biochar, vermicompost, as well as their combined application on ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) in soils contaminated with potentially toxic elements (PTEs) were investigated. In this regard, four treatments were performed; among them, treatment A served as a control without additive, treatment B with vermicompost (2%), treatment C with biochar (2%), and treatment D with biochar (2%) plus vermicompost (2%). In addition, the abundance and structure of the AOA and AOB amoA gene were measured using quantitative PCR and high-throughput sequencing. The relationships between the microbial community, physicochemical parameters, and CaCl2-extractable PTEs were analyzed using the Pearson correlation method. We found that adding biochar and vermicompost promoted the immobilization of PTEs and nitrogen biotransformation. The rational use of biochar and vermicompost is beneficial for the growth of bacterial and fungal communities in soils polluted by PTEs. AOA and AOB amoA genes were stimulated by biochar, vermicompost, and their combination, but their structure was hardly affected.
摘要：
To improve the hydrophilicity and long-lasting bacterial inhibition of poly(vinylidene fluoride) (PVDF) ultrafiltration membranes, DA/Ag-GO/PSF/PVDF hybrid ultrafiltration membranes were prepared with PVDF and polysulfone (PSF) as substrates, graphene oxide (GO) as additives, and dopamine (DA) and silver as surface modifications. The structure and performance of PSF/PVDF hybrid membranes were investigated by SEM, FTIR, contact angle, filtration flux, and bacterial inhibition tests. The results showed that with the addition of GO, the hydrophilicity of the PSF/PVDF hybrid membranes were enhanced, the water flux tended to be increased, the retention rate of bovine serum albumin were maintained above 94%, and the bacterial inhibition against Gram-negative and positive bacteria were obvious. When GO was added at 0.2 wt%, the contact angle of the hybrid membrane decreased from 87 degrees to 69 degrees, the water flux increased from 406.05 to 650.52 L m(-2) h(-1), the flux recovery increased from 49.18% to 84.40%, and the resistance to organic contamination was significantly improved.
期刊：
Science of The Total Environment,2023年858(Pt 1):159470 ISSN：0048-9697
通讯作者：
Wei Zhang
作者机构：
[Hu, Peilei; Xiao, Jun; Xiao, Lumei; Zhang, Wei; Xu, Lin; Ye, Yingying; Wang, Kelin; Xiao, Dan; Zhao, Jie] Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China;[Hu, Peilei; Xiao, Jun; Xiao, Lumei; Zhang, Wei; Xu, Lin; Ye, Yingying; Wang, Kelin; Xiao, Dan; Zhao, Jie] Huanjiang Observation and Research Station for Karst Ecosystems, Huanjiang, China;[Xu, Lin] College of Resources and Environment, Qingdao Agricultural University, Qingdao, China;[Zhang, Jiguang] Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao, China;[Hu, Peilei; Xiao, Jun; Wang, Kelin; Xiao, Dan; Zhao, Jie] Guangxi Industrial Technology Research Institute for Karst Rocky Desertification Control, Nanning, China
通讯机构：
[Wei Zhang] K;Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China<&wdkj&>Huanjiang Observation and Research Station for Karst Ecosystems, Huanjiang, China<&wdkj&>Guangxi Industrial Technology Research Institute for Karst Rocky Desertification Control, Nanning, China
关键词：
Bedrock exposure;Calcium;Initial pool size;Karst ecosystem;Soil carbon sequestration
摘要：
Vegetation restoration can increase soil carbon (C) content in karst regions characterized by highly exposed carbonate rocks; however, it remains unclear whether and how bedrock outcrops contribute to soil C-accumulation after vegetation restoration. We aimed to investigate the magnitude and mechanisms of bedrock outcrops on soil C-accumulation after vegetation restoration. Here, we selected 362 fixed locations to investigate changes in soil organic carbon (SOC) content and density before and after cropland restoration in a karst catchment with varying bedrock exposure ratios and initial soil C pools prior to restoration. Active vegetation restoration (i.e., cropland converted to forage grass, plantation forest, and a combination of grass and forest) and natural regeneration (cropland abandoned) were compared, with croplands maintained with no change as the control. Compared to croplands maintained with no change, SOC density significantly increased in the four vegetation restoration types. The SOC accumulation rate was higher for natural regeneration (39 g C m(-2) yr(-1)) than for the three active restoration strategies (18-27 g C m(-2) yr(-1)). SOC accumulation decreased with a higher initial pool size of soil C but increased with nitrogen accumulation and soil exchangeable calcium (Ca(2+)) concentration. Higher bedrock outcrops reduced soil volume but increased SOC content through their indirect effects on the initial pool size of soil C, external nitrogen inputs, and soil Ca(2+) concentration. This weakly promoted rather than inhibited SOC sequestration. Our findings highlight the effectiveness of various restoration strategies in promoting SOC accumulation in karst areas, as well as the need to take bedrock outcrops and initial soil C pools into consideration when modeling SOC dynamics and maximizing C sinks for vegetation restoration.
作者机构：
[滕伦; 张飞云; 马丽娜; Zhang F.] School of Public Management, Xinjiang Agricultural University, Xinjiang, Urumqi, 830052, China;[康建国] School of Resources and Environment, Hunan Agricultural University, Hunan, Changsha, 410128, China
通讯机构：
[Zhang, F.] S;School of Public Management, Xinjiang, China
关键词：
生态系统服务价值;时空演变;土地利用变化;新疆
摘要：
随着社会经济的发展,探究土地利用变化下生态系统服务价值(Ecosystem service value,ESV)时空演变对优化土地利用结构和区域持续发展有着重要意义。基于1980—2020年新疆土地利用数据,在ArcGI...展开更多 随着社会经济的发展,探究土地利用变化下生态系统服务价值(Ecosystem service value,ESV)时空演变对优化土地利用结构和区域持续发展有着重要意义。基于1980—2020年新疆土地利用数据,在ArcGIS和GeoDa支撑下,使用单位面积当量因子法、空间自相关等方法,分析新疆土地利用变化下ESV时空演变特征。结果表明:(1)1980—2020年新疆主要的土地利用类型是草地和未利用地,两者共占新疆总面积的91.00%。耕地和建设用地面积呈增加趋势,分别增长58.89%和166.79%;水域和林地面积减少量最多,分别减少29.95%和26.62%。(2)1980—2020年新疆ESV总体呈现“先增后减”的变化趋势,净减少1114.51×108元(6.68%)。从空间分布来看,新疆ESV高值区和较高值区主要分布在阿尔泰山、昆仑山、天山(简称“三山”)和伊犁河谷地区,中等价值区和较低价值区分布在绿洲地区,低价值区主要分布在盆地和沙漠地区。(3)1980—2015年新疆ESV变化很小,但2015—2020年北、中天山地区EVS变化显著。2015—2020年北、中天山地区高价值区减少75.29%,被中等价值区和较低值区取代;中等价值区和较低价值区分别增长13.64%和10.78%;低价值区有向中等价值区扩散趋势。(4)从ESV的空间自相关来看,局部相关性、热点分析呈现“西高东低”的空间分布特点。高-高集聚区、热点区分布在“三山”地区,低-低集聚区、冷点区分布在盆地和沙漠地区。水域和林地面积的下降是引起2015—2020年新疆生态系统服务总价值下降的主要原因之一。收起
作者机构：
[尹雪斐; 刘玉玲; 伍德; 黄薪铭; 张朴心; 铁柏清] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha;Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha;[尹雪斐; 刘玉玲; 伍德; 黄薪铭; 张朴心; 铁柏清] 410128, China<&wdkj&>Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha
作者机构：
[杨宇; 郭婷婷; 刘孝利; 铁柏清] College of Resources and Environment, Hunan Agricultural University, Changsha;410128, China;Technology and Research Center for Irrigation Water Resource and uality Purification, Hunan Province, Changsha;[杨宇; 刘孝利; 铁柏清] 410128, China<&wdkj&>Technology and Research Center for Irrigation Water Resource and uality Purification, Hunan Province, Changsha;[杨宇; 郭婷婷; 刘孝利; 铁柏清] 410128, China
作者机构：
[Long, Jiumei; Liu, Zui; Zhang, Guocheng; Zhou, Dongsheng; Wang, Jing; Luo, Yuanlai; Huang, Binyan] Hengyang Normal Univ, Coll Life Sci, Hunan Key Lab Conservat & Utilizat Biol Resources, Hengyang 421008, Peoples R China.;[Lei, Ming] Hunan Agr Univ, Coll Resource & Environm, Hunan Engn Res Ctr Safe & High Efficient Utilizat, Changsha 410128, Peoples R China.
通讯机构：
[Ming Lei] H;Hunan Engineering Research Center for Safe & High-Efficient Utilization of Heavy Metal Pollution Farmland, College of Resource & Environment, Hunan Agricultural University, Changsha, 410128, PR China
作者机构：
[铁柏清; 张威宇; 尹雪斐; 刘玉玲; 张朴心; 姚俊帆] College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China;[铁柏清; 张威宇; 尹雪斐; 刘玉玲; 张朴心; 姚俊帆] Hunan Engineering & Technology Research Center for Irrigation Water Purification, Changsha 410128, China;[铁柏清; 张威宇; 尹雪斐; 刘玉玲; 张朴心; 姚俊帆] Key Laboratory of Southern Farmland Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs, Changsha 410128, China
关键词：
Electron transfer;Hydroxyl radicals;Reaction sites;Reduced nontronite;Sulfamethoxazole degradation
摘要：
It has been documented that organic contaminants can be degraded by hydroxyl radicals (center dot OH) produced by the activation of H2O2 by Fe(II)-bearing clay. However, the interfacial electron transfer reactions between structural Fe(II) and H2O2 for center dot OH generation and its effects on contaminant remediation are unclear. In this study, we first investigated the relation between center dot OH generation sites and sulfamethoxazole (SMX) degradation by activating H2O2 using nontronite with different reduction extents. SMX (5.2-16.9 }mu mol/L) degradation first increased and then decreased with an increase in the reduction extent of nontronite from 22 to 62%, while the center dot OH production increased continually. Passivization treatment of edge sites and structural variation results revealed that interfacial electron transfer reactions between Fe(II) and H(2)O(2 )occur at both the edge and basal plane. The enhancement on basal plane interfacial electron transfer reactions in a high reduction extent rNAu-2 leads to the enhancement on utilization efficiencies of structural Fe(II) and H2O2 for center dot OH generation. However, the center dot OH produced at the basal planes is less efficient in oxidizing SMX than that of at edge sites. Oxidation of SMX could be sustainable in the H2O2/rNAu-2 system through chemically reduction. The results of this study show the importance role of center dot OH generation sites on antibiotic degradation and provide guidance and potential strategies for antibiotic degradation by Fe(II)-bearing clay minerals in H2O2-based treatments. (C) 2022 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
摘要：
Stenotrophomonas maltophilia J2, a highly efficient pyridine-degrading bacterium, was isolated from the aerobic tank of a pesticide-contaminated wastewater treatment plant. The strain J2 demonstrated an impressive pyridine degradation rate of 98.34% & PLUSMN; 0.49% within 72 h, at a pyridine concentration of 1100 mg & BULL;L-1, a temperature of 30 degrees C, a pH of 8.0, and a NaCl concentration of 0.5%. Notably, two new pyridine metabolic intermediates, 1,3dihydroxyacetone and butyric acid, were discovered, indicating that J2 may degrade pyridine through two distinct metabolic pathways. Furthermore, the immobilized strain J2 was obtained by immobilizing J2 with biochar derived from the stem of Solidago canadensis L. In the pyridine-contaminated wastewater bioremediation experiment, the immobilized strain J2 was able to remove 2000 mg & BULL;L-1 pyridine with a 98.66% & PLUSMN; 0.47% degradation rate in 24 h, which was significantly higher than that of the control group (3.17% & PLUSMN; 1.24%), and remained above 90% in subsequent cycles until the 27th cycle. High-throughput sequencing analysis indicated that the J2 +B group had an elevated relative abundance of bacteria and functional genes that could be associated with the degradation of pyridine. The results offer a foundation for the effective use of immobilized strain in the treatment of recalcitrant pyridine-contaminated wastewater.
通讯机构：
[Jiachao Zhang; Zhiyong Yan] H;Hunan International Scientific and Technological Cooperation Base of Agricultural Typical Pollution Remediation and Wetland Protection, Hunan Agricultural University, Changsha 410028, China
摘要：
This study screened a Trichoderma strain (Trichoderma pubescens DAOM 166162) from activated sludge to solve the limitation of traditional biological processes in the treatment of amoxicillin (AMO) containing wastewater. The mechanism of the removal of AMO wastewater by T. pubescens DAOM 166162 (TPC) was studied. AMO resulted in a higher protein percentage in the extracellular polymeric substances (EPS) secreted by TPC, which facilitated the removal of AMO from the wastewater. Fourier transform infrared spectroscopy and excitation-emission matrix were used to characterize EPS produced by metabolizing different carbon sources. It was found that the hydroxyl group was the primary functional group in EPS. The life activity of TPC was the cause of the pH rise. The main pathway of degradation of AMO by TPC was the hydroxyl group uncoupling the lactam ring and the hydrolysis of AMO in an alkaline environment. The removal efficiency of AMO in wastewater by TPC was >98 % (24 h), of which the biodegradation efficiency was 70.01 ± 1.48 %, and the biosorption efficiency was 28.44 ± 2.97 %. In general, TPC is an effective strain for treating wastewater containing AMO. This research provides a new idea for AMO wastewater treatment.
通讯机构：
[Lin Tang] C;College of Environmental Science and Engineering, Hunan University, Changsha 410082, China<&wdkj&>Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China
摘要：
The abuse of pesticides and antibiotics and their harm to the environment are the disadvantages of modern agriculture and breeding industry. g-C3N4 has shown great potential in photocatalytic water pollution purifi-cation under visible light irradiation, however, the conventional g-C3N4 suffers from the disadvantage of limited optical absorption and serious charge recombination, resulting in inefficient light energy conversion and pollutant degradation. This study provides a strategy of combining defect engineering with a built-in electric field to prepare homojunction a photocatalyst with high optical absorption rate and charge separation efficiency. Experiments and DFT simulation revealed the mechanism of significant improvement in the photocatalytic performance of the prepared catalyst, and proposed the pollutant degradation pathway. In addition, the pho-tocatalytic effects of the prepared catalysts on different natural water bodies, natural light, and various water conditions were investigated, revealing the applicability of the catalysts in the purification of pollutants in various water environments. <comment>Superscript/Subscript Available</comment
