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Effect of biochar on the bioavailability of difenoconazole and microbial community composition in a pesticide-contaminated soil
Jianzhong Cheng;  Xinqing Lee;  Weichang Gao;  Yi Chen;  Wenjie Pan;  Yuan Tang
2017
Source PublicationApplied Soil Ecology
Volume121Pages:185-192
Abstract

Biochar is a soil amendment for carbon sequestration and contaminant remediation. However, there is relatively little information on the impact of biochar on soil microorganisms that play key roles in pollutant degradation. We investigated the interrelations between soil chemical properties, microbial community, and difenoconazole bioavailability after biochar amendments. Biochar was prepared by pyrolysis of flue-cured tobacco stalks. It was applied at four levels, 0%, 1.0%, 2.5%, and 5.0% (w/w), respectively, to soils in the presence and absence of tobacco plants (K326). Biochar increased soil pH, organic matter, total carbon, total nitrogen, C/N ratio and plant biomass. After 90 d incubation, 99% of the difenoconazole was degraded in planted and unplanted soils (control), whereas only 88% and 83% of difenoconazole was degraded in the 5.0% biochar-amended soil with and without plant, respectively. Difenoconazole had greater persistence in soil amended with biochar but plant uptake of difenoconazole was significantly decreased with increasing biochar application level. Compared to the control, the total plant residue of difenoconazole decreased by 24%, 41% and 45% in the 1.0%, 2.5% and 5.0% biochar treatments, respectively. Reduced plant uptake was related to increased sorption and microbial degradation of difenoconazole in biochar treated soils. High-throughput sequencing revealed that biochar altered soil bacterial community composition. Biochar amendment in planted soils increased the average relative abundance of Sphingomonadaceae and Pseudomonadaceae by 18% and 63%, respectively. When plants were absent, Sphingomonadaceae and Pseudomonadaceae increased by 46% and 110%, respectively. Therefore, biochar amendment enhances difenoconazole-degrading bacteria by modifying soil chemical properties, and eventually reduces difenoconazole bioavailability in contaminated soils.

KeywordBiochar Bacteria Pyrosequencing Bioavailability Degradation Difenoconazole
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7718
Collection环境地球化学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Guizhou, Peoples R China
2.Guizhou Acad Tobacco Sci, Guiyang 550081, Guizhou, Peoples R China
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Jianzhong Cheng;Xinqing Lee;Weichang Gao;Yi Chen;Wenjie Pan;Yuan Tang. Effect of biochar on the bioavailability of difenoconazole and microbial community composition in a pesticide-contaminated soil[J]. Applied Soil Ecology,2017,121:185-192.
APA Jianzhong Cheng;Xinqing Lee;Weichang Gao;Yi Chen;Wenjie Pan;Yuan Tang.(2017).Effect of biochar on the bioavailability of difenoconazole and microbial community composition in a pesticide-contaminated soil.Applied Soil Ecology,121,185-192.
MLA Jianzhong Cheng;Xinqing Lee;Weichang Gao;Yi Chen;Wenjie Pan;Yuan Tang."Effect of biochar on the bioavailability of difenoconazole and microbial community composition in a pesticide-contaminated soil".Applied Soil Ecology 121(2017):185-192.
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