College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China.
Sci Total Environ. 2021 Jan 1;750:141719. doi: 10.1016/j.scitotenv.2020.141719. Epub 2020 Aug 15.
Organic amendments (OAs) application is a practical strategy to improve soil organic carbon (SOC) in agriculture. The present study evaluated the impact of different OAs on the transformation of carbon and the dynamics of microorganisms in a 77-day incubation experiment. The OA treatments applied included wheat straw (U + WS), pig manure (U + PM), compost (U + CP), and improved compost (U + IC), and the no amendment group was the CK. After incubation, the SOC increased significantly in the U + WS group, but the other OA treatments had no significant effect relative to the CK. Among the OA treatments, U + CP and U + IC had lower CO-C cumulative mineralization and the highest humification of dissolved organic carbon (DOC). U + PM had the lowest SOC content and the lowest aromatization of DOC. Redundancy analyses (RDA) showed that the CO-C cumulative mineralization directly influenced the DOC, extracted organic carbon (EOC) and microbial biomass carbon (MBC) in all treatments. Proteobacteria positively correlated with SOC and MBC, Bacteroidetes were significantly related to DOC, and Gemmatimonadetes had a significant negative relationship with CO-C cumulative mineralization. These results showed that U + CP and U + IC were more conducive to carbon sequestration, and U + PM was the most unfavourable during the incubation. Wheat straw played an important role in the steady improvement of the SOC.
有机肥料（OAs）的应用是提高农业土壤有机碳（SOC）的一种实用策略。本研究通过 77 天的培养实验，评估了不同 OAs 对碳转化和微生物动态的影响。OA 处理包括小麦秸秆（U+WS）、猪粪（U+PM）、堆肥（U+CP）和改良堆肥（U+IC），不添加 OA 的处理为 CK。培养后，U+WS 组的 SOC 显著增加，而其他 OA 处理与 CK 相比无显著影响。在 OA 处理中，U+CP 和 U+IC 的 CO-C 累积矿化率较低，DOC 的腐殖化程度较高。U+PM 的 SOC 含量最低，DOC 的芳构化程度最低。冗余分析（RDA）表明，CO-C 累积矿化直接影响所有处理中的 DOC、提取有机碳（EOC）和微生物生物量碳（MBC）。变形菌与 SOC 和 MBC 呈正相关，拟杆菌与 DOC 显著相关，芽单胞菌与 CO-C 累积矿化呈显著负相关。这些结果表明，U+CP 和 U+IC 更有利于碳固定，而 U+PM 在培养过程中最不利于碳固定。小麦秸秆对 SOC 的稳定提高起着重要作用。
