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| Dissolved Organic Matter from Chinese Milk Vetch（Astragalus sinicus L.） Enhances Pentachlorophenol Reductive Transformation and Iron Reduction in a Flooded Paddy Soil |
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| KeyWord:Chinese milk vetch; dissolved organic matter; Gleyi-Stagnic Anthrosol; pentachlorophenol; active iron species; sequential extraction; stepwise regression model |
| Author Name | Affiliation | | LIU Yong | Guangdong Key Laboratory of Agro-Environment Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China | | YU Xiong-sheng | Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zijingang Campus, Zhejiang University, Hangzhou 310058, China | | LI Fang-bai | Guangdong Key Laboratory of Agro-Environment Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China | | XU Jian-ming | Institute of Soil and Water Resources and Environmental Science, College of Environmental and Resource Sciences, Zijingang Campus, Zhejiang University, Hangzhou 310058, China | | LOU Jun | College of Resource and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, China | | LIU Chuan-ping | Guangdong Key Laboratory of Agro-Environment Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China |
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| Abstract: |
| This study investigated the effects of dissolved organic matter（DOM） from green manure on pentachlorophenol（PCP） reductive transformation and Fe（Ⅲ） reduction under flooded soil conditions. Batch experiments were conducted to explore the kinetics of PCP reductive transformation and its relationship with Fe（Ⅱ） accumulation in a flooded paddy soil（Gleyi-Stagnic Anthrosol） amended with fresh or decomposed（continuously-flooded, CF or non-flooded, NF; 7 and 14 d） DOM from Chinese milk vetch（Astragalus sinicus L., CMV; 800 mg C·L-1）. The 5 treatments of CMV-derived DOM（CMV-DOM） significantly enhanced the reductive transformation of PCP and the accumulation of NaOAc-extractable or sequential NaOAc- and HCl-extractable Fe（Ⅱ） [Fe（Ⅱ）NaOAc+HCl] after 6.5 and 2 d of flooding, respectively（P<0.05）. In most cases, the addition of CMV-DOM greatly increased NaOAc-extractable Fe（Ⅲ） owing to non-reductive dissolution. The relationship between reduction kinetics and selected environmental variables was examined by correlation analysis and regression analysis. Sequential NaOAc-and HCl-extractable Fe（Ⅱ） was found playing a vital role in PCP reductive transformation, and a stepwise regression model was established as follows: PCP(mg·kg-1）=22.95-0.047Fe（Ⅱ）NaOAc+HCl（mg·kg-1）（R2=0.615, P<0.01）. The results demonstrated that addition of CMV-DOM accelerated PCP reductive transformation and Fe（Ⅲ） reduction in the flooded paddy soil. In terms of soil chemistry, enhanced PCP reductive transformation in flooded paddy soil is attributable to generation of adsorbed Fe（Ⅱ） with high redox activity. |
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