14 year applications of chemical fertilizers and crop straw effects on soil labile organic carbon fractions, enzyme activities and microbial community in rice-wheat rotation of middle China
文献类型： 外文期刊
作者： Liu, Bo 1 ; Xia, Hao 2 ; Jiang, Cuncang 2 ; Riaz, Muhammad 4 ; Yang, Li 1 ; Chen, Yunfeng 1 ; Fan, Xianpeng 1 ; Xia, Xiange 1 ;
作者机构： 1.Hubei Acad Agr Sci, Inst Plant Protect & Soil Fertilizer, Key Lab Fertilizat Agr Wastes, Minist Agr & Rural Affairs, Wuhan 430064, Hubei, Peoples R China
2.Huazhong Agr Univ, Coll Resources & Environm, Microelement Res Ctr, Wuhan 430070, Hubei, Peoples R China
3.Shihezi Univ, Key Lab Oasis Ecoagr, Xinjiang Prod & Construct Corps, Shihezi 832000, Xinjiang, Peoples R China
4.Zhongkai Univ Agr & Engn, Coll Resources & Environm, Guangzhou 510225, Peoples R China
关键词： Straw; Labile organic carbon; Soil enzyme activity; Soil microorganisms; Long-term fertilization
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：10.753； 五年影响因子：10.237 ）
ISSN： 0048-9697
年卷期： 2022 年 841 卷
页码：
收录情况： SCI
摘要： Traditional fertilization management can damage soil structure and lead to severe soil erosion. The practice of crop straw returning to the field reduces the negative impact of straw burning and improves soil quality. We investigated the effects of these agricultural practices on soil organic carbon components, enzyme activities, and soil microorganisms over 14 years of field experiments. Specifically, we studied four management strategies: no fertilizer or crop straw returning (CK), traditional chemical fertilization (NPK), crop straw returning (S), and crop straw returning with chemical fertilizer (NPKS). We found NPKS treatments significantly (P < 0.05) increased the dissolved organic carbon (DOC), microbial biomass carbon (MBC), particulate organic carbon (POC) and readily oxidized organic carbon (ROC) concentrations by 79.32 %, 82.16%, 92.46%, and 104.32 % relative to CK. Furthermore, under NPKS, the activities of soil enzymes related C, N, and P (a-glucosidase (aG), f3-glucosidase (f3G), cellulase (CBH), xylanase (f3X), acetyl f3-glucosaminidase (NAG), leucine aminopeptidase (LAP), and acid phosphate (AP)) were increased by 54.66 %, 113.26 %, 76.73 %, 52.41 %, 45.74 %, 56.69 %, and 68.92 % relative to CK, respectively. Redundancy analysis and structural equation modelling showed that straw returning had positive effects on soil microbial community diversity and richness, and also improved microbial activity which is favorable in the degradation of soil carbon. Furthermore, we found that soil fungi were more sensitive than bacteria to changes in soil carbon composition and enzyme activities following straw returning. These results suggest that straw returning combined with chemical fertilizer can be an effective strategy to improve soil labile organic carbon components, enzyme activities, and ecological function of microorganisms.
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