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Land use and mineral fertilization influence soil microbial biomass and residues: A case study of a Chinese Mollisol
European Journal of Soil Biology ( IF 3.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.ejsobi.2020.103216 Xu Chen , Xiaozeng Han , Jun Yan , Xinchun Lu , Xiangxiang Hao , Wei Wang , Asim Biswas , Xia Zhu-Barker , Wenxiu Zou
European Journal of Soil Biology ( IF 3.7 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.ejsobi.2020.103216 Xu Chen , Xiaozeng Han , Jun Yan , Xinchun Lu , Xiangxiang Hao , Wei Wang , Asim Biswas , Xia Zhu-Barker , Wenxiu Zou
Abstract The biology of soil is critical to its health; the available carbon and nitrogen from plant litter and mineral fertilizers in the soil determines the structure of microbial communities and thus the functioning of soil. We used amino sugars (ASs) and phospholipid fatty acids (PLFAs) as microbial biomarkers to assist in identifying the effect of practices of agricultural management on the microbial community. We determined the contents and compositions of ASs and PLFAs in the soils of five long-term (12 years) practices of land management: bare land (BL), grassland (GL), and land with continuous wheat (WC), soybean (SC), and maize (MC) cropping systems. BL and GL were not fertilized, but WC, SC, and MC were supplied with either mineral fertilizer (WCF, SCF, and MCF, respectively) or no fertilizer as controls (WC, SC, and MC, respectively). The contents of ASs and PLFAs in WC, SC, and MC were somewhere in the middle of those between GL and BL. Soils amended with maize material accumulated more ASs than soils amended with soybean or wheat material. The AS contents were 7.2 and 10.3% lower in WCF and SCF than WC and SC, respectively, but were 6.4% higher in MCF than MC. The contribution of fungi to the pools of soil organic carbon were significantly lower when mineral fertilizer was added, indicated by structural equation modeling under a continuous supply of N. The new carbon accumulated by microbes was positively contributed more by residues derived bacteria than from fungi. These results indicated that long-term practices of land management significantly altered the soil microbial communities and their contribution to SOC accumulation.
更新日期：2020-09-01
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