Crop straw incorporation increases the soil carbon stock by improving the soil aggregate structure without stimulating soil heterotrophic respiration

作者：Hongyu Lin, Jing Zheng, Minghua Zhou, Peng Xu, Ting Lan, Fuhong Kuang, Ziyang Li, Zhisheng Yao, Bo Zhu · 发表于：Journal of Integrative Agriculture · 年份：2024 · DOI：10.1016/j.jia.2024.09.026 · 被引用次数：17 · 研究领域：Soil Carbon and Nitrogen Dynamics、Bioenergy crop production and management、Rice Cultivation and Yield Improvement

• SOC stocks are significantly increased after 11-year crop straw incorporation. • Crop straw incorporation significantly enhances soil aggregate structure. • 50% chopped straw incorporation delivers the largest benefits for the SOC stock in calcareous soils. Crop straw incorporation is widely recommended to maintain crop yields and improve soil organic carbon (SOC) stocks as well as soil quality. However, the long-term effects of different straw incorporation practices on the SOC stock remain uncertain. In this study, a long-term experiment (2007 to 2018) with four treatments (MW 0 : maize–wheat rotation with no straw incorporation, MW 50 : maize–wheat rotation with 50% chopped straw incorporation, MW b50 : maize–wheat rotation with 50% in situ burned harvested straw, and MF 50 : maize–fallow rotation with 50% harvested maize straw incorporation) was set up to evaluate the response of the SOC stock to different straw incorporation methods. The results showed that the SOC stock significantly increased by 32.4, 12.2 and 17.4% under the MW 50 , MW b50 and MF 50 treatments, respectively, after continuous straw incorporation over a decade, while the SOC stock under MW 0 was significantly reduced by 22.9% after the 11 year long-term experiment. Compared to MW 0 , straw incorporation significantly increased organic carbon input, and improved the soil aggregate structure and the ratio of dissolved organic carbon (DOC) to particulate organic carbon (POC), but it did not significantly...