Effects of different returning method combined with decomposer on decomposition of organic components of straw and soil fertility

作者：Xiao Wang, Xuexin Wang, Peng Geng, Qian Yang, Kun Chen, Ning Liu, Yueling Fan, Xiumei Zhan, Xiaori Han · 发表于：Scientific Reports · 年份：2021 · DOI：10.1038/s41598-021-95015-5 · 被引用次数：46 · 研究领域：Soil Carbon and Nitrogen Dynamics、Pesticide and Herbicide Environmental Studies、Polymer-Based Agricultural Enhancements

Abstract In view of the problems of low straw decomposition rates and reduced soil fertility in southern Liaoning, China, we investigated the effects of no-tillage mode (NT), deep loosening + deep rotary tillage mode (PT), rotary tillage mode (RT) and the addition of decomposing agent (the next is called a decomposer) (NT + S, PT + S, RT + S) on the decomposition proportion of straw, respectively, by using the nylon net bag method in combination with 365-day field plot experiments. The decomposition rules of cellulose, hemicellulose and lignin as well as the dynamics of soil organic carbon (SOC), soil microbial biomass carbon (MBC) and soil dissolved organic carbon (DOC) in straw returned to the field for 15, 35, 55, 75, 95, 145 and 365 days were analyzed. The results showed that in the short term, the decomposition of straw was better in both the rotray tillage and deep loosening + deep rotary modes than in the no-tillage mode, and the addition of decomposer significantly promoted the decomposition of straw and the release of carbon from straw, among them, the RT + S treatment had the highest straw decomposition proportion and carbon release proportion in all sampling periods. After a one year experimental cycle, the RT + S treatment showed the highest proportion of cellulose, hemicellulose and lignin decomposition with 35.49%, 84.23% and 85.50%, respectively, and soil SOC, MBC and DOC contents were also higher than the other treatments with an increase of 2.30 g kg −1 , 14....