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《Ecology and Environmental Sciences》 2019-03
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Vermicompost Application Accelerates Organic Phosphorus Mineralization in A Paddy Soil:A Mechanism Study

ZHANG Feng;WANG Rongping;LIANG Jiawei;WU Yonggui;WANG Xianjie;LIAO Xinrong;Resource and Environmental Engineering College, Guizhou University;Guangdong Institute of Eco-Environmental Science & Technology/Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management;  
Organic phosphorus(P) is an important part of soil P pool, and the mineralization of soil organic P plays a significant role in P nutrition of plant growth. Being very different from common compost products in physical, chemical, and biological properties,vermicompost is a kind of ecological organic fertilizer and soil ameliorant produced by fermentation of organic waste and enzymatic action of earthworm's digestive system. In this study, a pot experiment was conducted to investigate the effects of vermicompost application on organic P transformation and microbial activity in a paddy soil cropped with Brassica chinensis L. Vermicompost was applied at 4 levels of CK: 0 g·kg~(-1), A1: 40 g·kg~(-1), A2: 80 g·kg~(-1), and A3: 120 g·kg~(-1). The treatments were carried out in 4 replicates.Soil samples were collected at day 0, 7, 14, 21, and 35 after Brassica chinensis L. transplanting. Soil sample analysis results showed that:(1) vermicompost application significantly affected the microbial biomass carbon(C) and microbial biomass P in both the bulk and rhizosphere soil(P0.05), and the microbial biomass C/P ratio in rhizosphere soil was 1.9 to 2.0 times higher than that in bulk soil in all the treatments.(2) Compared with CK, vermicompost application significantly increased acid phosphatase activity and the contents of Olsen-P and various P species in soil. And(3) correlation analyses indicated the following: moderately stable organic P(Na OH-P_o) had a significantly negative correlation with both microbial biomass P and acid phosphatase activity in all the treatments.In A2 and A3, microbial biomass P had a significantly negative correlation with labile organic P(NaHCO_3-P_o). Na HCO_3-P_o had a significantly positive correlation with NaOH-P_o, and stable organic P(C.HCl-P_o) had a significantly negative correlation with both Na OH-P_o and NaHCO_3-P_o. These results indicated that: vermicompost application significantly increased acid phosphatase activity and Na OH-P_o content, and drove forward the P fixation by soil microorganisms while effectively promoted the activation of Na OH-P_o. Microbial biomass P or P fixation by microorganisms was higher in bulk soil than in rhizosphere soil. While promoting the mineralization of NaOH-P_o and NaHCO_3-P_o, vermicompost promoted the formation of C.HCl-P_o as well. Microbial biomass P promoted the formation of C.HCl-P_o. These results are expected to provide a scientific basis for improving the utilization rate of P fertilizers and promote the better use of vermicompost.
【Fund】: 广东省科学院实施创新驱动发展能力建设专项(2018GDASCX-0106);; 广东省科技计划项目(2018LM2151);; 广州市科技计划项目(201607010082);; 国家科技支撑项目(2014BAD14B05)
【CateGory Index】: S153.6
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