Cultivating crop reduces microbial necromass carbon accumulation but contributes fungal derived- soil organic carbon formation in fertilized soils with straw addition

文献类型： 外文期刊

第一作者： Mei, Xiuwen

作者： Mei, Xiuwen;Zhu, Tengxiao;Li, Yuping;Li, Shuangyi;Sun, Liangjie;An, Tingting;Wang, Jingkuan;Mei, Xiuwen;Li, Yuping

作者机构：

关键词： Soil organic carbon; Microbial necromass carbon; Straw returning; Cultivating crop; Fertilization

期刊名称：PLANT AND SOIL （ 影响因子：4.1； 五年影响因子：4.7 ）

ISSN： 0032-079X

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Background and Aims Microbial necromass carbon (C) largely contributes to soil organic carbon (SOC) sequestration. Soil microorganisms drive the transformation process of straw C. Crop growth creates an intricate microenvironment for soil microorganisms. However, whether and how cultivating crop affects microbial derived- SOC sequestration in soil profile remains unclear. This research aimed to clarify the effects of cultivating crop on total microbial necromass C (C-M) accumulation, and its contribution to SOC formation, and to explore the factors driving C-M sequestration in soils with straw addition. Methods We conducted an in-situ field experiments with only C-13-labeled straw addition (S) and its combined with cultivating crop (SR) in soils with long-term chemical fertilizers application (NP) or without fertilization (CK). Results On the 510th day, straw-derived C-M averagely was 32.1% higher (P < 0.05) in SR versus S treatments and its contribution to newly formed SOC averagely was 13.6% higher (P < 0.05) in NP versus CK treatments. The fungal necromass C (C-F) content at varied soil depths were 15.3%-35.1% lower in NP + SR versus NP + S treatments (P < 0.05) on the 50th day. SR increased the C-F content at 20-40 and 40-50 cm soil depths by 23.9% and 49.2%, respectively, relative to S under CK treatments (P < 0.05), while the contrast result was found under NP treatments on the 510th day. Cultivating crop directly and negatively affected the C-M accumulation by regulating microbial biomass and soil properties, which induced the microbial contribution to SOC increased with soil depths during the whole stage. Conclusion The co-existence of cultivating crop with straw addition promoted SOC renewal via newly formed fungal necromass in fertilized soils.

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