Comparing carbon sequestration efficiency in chemically separated soil organic carbon fractions under long-term fertilization in three major Chinese croplands

作者：Hu Xu, Adnan Mustafa, Lu Zhang, Shaomin Huang, Hong‐Jun Gao, Mohammad Tahsin Karimi Nezhad, Nan Sun, Minggang Xu · 发表于：Journal of Integrative Agriculture · 年份：2024 · DOI：10.1016/j.jia.2024.12.013 · 被引用次数：6 · 研究领域：Soil Carbon and Nitrogen Dynamics、Agriculture, Soil, Plant Science、Bioenergy crop production and management

• Manure with chemical fertilizers boosted SOC stocks and enhanced CSE across SOC pools. • Non-labile OC was the main driver of SOC stabilization, especially in the passive pool. • The CSE of SOC fractions and pools declined with greater OC input, temperature, and precipitation. The combined application of organic manure and chemical fertilizers is an effective way to enhance soil organic carbon (SOC) sequestration through its influences on organic carbon (OC) input and the stability of SOC fractions. However, there is limited information on the carbon sequestration efficiency (CSE) of chemically separated SOC fractions and its response to OC input under long-term fertilization regimes, especially at different sites. This study used three long-term fertilization experiments in Gongzhuling, Zhengzhou and Qiyang spanning 20 years to compare the stocks and CSE in four different OC fractions (very labile OC, labile OC, less labile OC, and non-labile OC) and their relationships with annual OC input. Three treatments of no fertilization (CK), chemical nitrogen, phosphorous, and potassium fertilizers (NPK), and chemical NPK combined with manure (NPKM) were employed. The results showed that compared with CK, NPKM resulted in enhanced SOC stocks and sequestration rates as well as CSE levels of all fractions irrespective of experimental site. Specifically for the very labile and non-labile OC fractions, NPKM significantly increased the SOC stocks by 43 and 83%, 77 and 86%, and 73 and 8...