ABSTRACT

Returning organic materials is recognized as an effective practice to alter soil organic carbon (SOC) content, in which microorganisms play a critical role. The objective of this study was to evaluate the effects of different kinds of animal manure combined with stover (AM-S treatments) on labile organic C fractions and soil microbial community. The two-year experiment involved four treatments: maize stover only (S), maize stover plus ox manure (SO), maize stover plus chicken manure (SC), and maize stover plus pig manure (SP). In 2018 and 2019, AM-S treatments increased the levels of SOC, dissolved organic carbon (DOC), easily oxidized carbon (EOC), microbial biomass carbon (MBC), and maize yields. Maize stover plus ox manure treatment could provide better accumulation of MBC, and enhance bacterial and fungal richness and diversity. Maize stover plus pig manure treatment enhanced the contents of DOC and maize yield and also recorded the highest percentage of Proteobacteria (57.6%). Also, the EOC contents were 13.0% and 21.5% higher than SO and SC respectively. In all, our findings suggested that the application of maize stover plus pig manure was the most effective treatment for enhancing labile SOC fractions and improving the microbial community.

摘要

返回有机材料被认为是改变土壤有机碳 (SOC) 含量的有效做法，其中微生物起着关键作用。本研究的目的是评估不同种类的动物粪便结合秸秆（AM-S 处理）对不稳定有机碳组分和土壤微生物群落的影响。为期两年的实验涉及四种处理：仅玉米秸秆（S）、玉米秸秆加牛粪（SO）、玉米秸秆加鸡粪（SC）和玉米秸秆加猪粪（SP）。在 2018 年和 2019 年，AM-S 处理提高了 SOC、溶解有机碳 (DOC)、易氧化碳 (EOC)、微生物生物量碳 (MBC) 和玉米产量的水平。玉米秸秆加牛粪处理可以提供更好的 MBC 积累，并提高细菌和真菌的丰富度和多样性。变形菌(57.6%)。此外，EOC 含量分别比 SO 和 SC 高 13.0% 和 21.5%。总而言之，我们的研究结果表明，玉米秸秆加猪粪的应用是提高不稳定 SOC 分数和改善微生物群落的最有效处理方法。