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| Impacts of vermicompost application on phosphorus species and microbial activity in paddy soils |
| Received:July 20, 2018 |
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| KeyWord:paddy soils;phosphorus species;transformation;vermicompost |
| Author Name | Affiliation | E-mail | | ZHANG Feng | Guangdong Institute of Eco-Environmental Science & Technology, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangzhou 510650, China
Resource and Environmental Engineering College, Guizhou University, Guiyang 550025, China | | | WANG Rong-ping | Guangdong Institute of Eco-Environmental Science & Technology, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangzhou 510650, China | rpwang@soil.gd.cn | | LIANG Jia-wei | Guangdong Institute of Eco-Environmental Science & Technology, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangzhou 510650, China | | | LIAO Xin-rong | Guangdong Institute of Eco-Environmental Science & Technology, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangzhou 510650, China | | | LI Sen | Guangdong Institute of Eco-Environmental Science & Technology, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangzhou 510650, China | | | SHI Yong-feng | Guangdong Institute of Eco-Environmental Science & Technology, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangzhou 510650, China | | | WU Yong-gui | Resource and Environmental Engineering College, Guizhou University, Guiyang 550025, China | ygwu72@126.com |
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| Abstract: |
| In this study, a pot experiment was conducted to investigate the effects of vermicompost application on phosphorus (P) transformation and microbial activity in a paddy soil cropped with pakchoi. The results showed that:(1) vermicompost application significantly affected the pH, Eh, water soluble Fe (Ⅱ), hydrochloric acid extractable Fe (Ⅱ), microbial biomass carbon (C), microbial biomass P, microbial biomass C/P ratio, and acid phosphatase activity of paddy soils (P<0.05) and (2) with the exception of C.HCl-Pi, vermicompost application greatly increased the contents of various P species in soil; specifically, labile Pi (ncluding Resin-P, NaHCO3-Pi and NaHCO3-Po) and moderately stable Pi (ncluding NaOH-Pi and NaOH-Po) were significantly increased (P<0.01). Correlation analyses indicated the following:acid phosphatase activity had a significant positive correlation with microbial biomass C, but a significant negative correlation with NaHCO3-Po (P<0.05), Resin-P (P<0.01), and NaOH-Po (P<0.01); microbial biomass C had a significant negative correlation with both Resin-P and NaHCO3-Po (P<0.01), but a significant positive correlation with hydrochloric acid extractable Fe (Ⅱ) (P<0.01); hydrochloric acid extractable Fe (Ⅱ) had a significant negative correlation with both NaHCO3-Po and NaOH-Pi (P<0.05); NaHCO3-Pi had a significant positive correlation with NaOH-Pi (P<0.01); and Resin-P had a significant positive correlation with both NaHCO3-Po and NaOH-Po (P<0.01). These results indicated that earthworm cast application could effectively promote the dissolution and reduction of Fe (Ⅲ) and the consequent release of NaOH-Pi. In addition, earthworm cast application could effectively improve soil quality, promote P activation and fixation by soil microorganisms, and enhance acid phosphatase activity, which has a significant impact on NaOH-Po. The Resin-P increase was mainly due to the decomposition of NaHCO3-Po and NaOH-Po, and NaOH-Pi was the main source of NaHCO3-Pi. These results are expected to provide a scientific basis for improving the utilization rate of P fertilizers and promote the better use of vermicompost. |
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