Effects of Short-Term Rice Straw Return on the Soil Microbial Community

Enze Wang, Xiaolong Lin, Lei Tian, Xinguang Wang, Li Ji, Feng Jin and Chunjie Tian
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Enze Wang: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
Xiaolong Lin: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
Lei Tian: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
Xinguang Wang: College of Biotechnology, Tianjin University of Science and Technology, Tianjin 300457, China
Li Ji: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
Feng Jin: Faculty of Agriculture, Jilin Agricultural University, Changchun 130102, China
Chunjie Tian: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China

Agriculture, 2021, vol. 11, issue 6, 1-15

Abstract: Rice straw is a byproduct of agricultural production and an important agricultural resource. However, rice straw has not yet been effectively used, and incorrect treatment methods (such as burning in the field) can cause serious damage to the environment. Studies have shown that straw returning is beneficial to soil, but there have been few studies focused on the effect of the amount of short-term straw returned on the soil microbial community. This study evaluates 0%, 50%, 75%, and 100% rice straw returned to the field on whether returning different amounts of straw in the short term would affect the diversity and composition of the soil microbial community and the correlation between bacteria and fungi. The results show that the amount of straw returned to the field is the main factor that triggers the changes in the abundance and composition of the microbial community in the paddy soil. A small amount of added straw (≤50% straw added) mainly affects the composition of the bacterial community, while a larger amount of added straw (>50% straw added) mainly affects the composition of the fungal community. Returning a large amount of straw increases the microbial abundance related to carbon and iron cycles in the paddy soil, thus promoting the carbon and iron cycle processes to a certain extent. In addition, network analysis shows that returning a large amount of straw also increases the complexity of the microbial network, which may encourage more microbes to be niche-sharing and comprehensively improve the ecological environment of paddy soil. This study may provide some useful guidance for rice straw returning in northeast China.

Keywords: straw returning; microbial community; network analysis; Northeast of China (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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