Soil organic carbon trade-offs under conservation tillage: Carbon stock versus stability mediated by particulate and mineral-associated fractions

文献类型： 外文期刊

第一作者： Jiang, Rui

作者： Jiang, Rui;Peng, Xinhua;Jiang, Rui;Liu, Shuai;Guo, Zichun;Adingo, Samuel;Chen, Zengming;Gao, Lei;Jiang, Fahui;Chen, Zengming;Gao, Lei;Peng, Xinhua

作者机构：

关键词： Conservation tillage; Soil organic carbon stocks; Particulate organic carbon; Mineral-associated organic carbon; Soil organic carbon stability; Meta-analysis

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.8； 五年影响因子：7.8 ）

ISSN： 0167-1987

年卷期： 2025 年 254 卷

页码：

收录情况： SCI

摘要： Conservation tillage (CS) has been widely applied to maintain the sustainability of agricultural systems. Soil organic carbon (SOC) fractions, including particulate organic carbon (POC) and mineral-associated organic carbon (MAOC), facilitate the comprehension and prediction of further dynamics of SOC. However, there is a limited understanding of how CS affects the interplay of SOC fractions stocks and SOC stability (POC:MAOC ratio, briefly noted as P/M ratio) across soil layers. Herein, we conducted a meta-analysis to quantitatively examine CS-induced changes in the SOC fractions stocks and their stability in the two depth soil layers (0-10 cm for upper topsoil and 10-20 cm for lower topsoil) under varying climatic factors, initial soil conditions, and agronomic practices. Our findings indicate that relative to conventional tillage (CT), CS notably increased SOC stock (14.7 %) in the upper topsoil by increasing POC stock (27.4 %), while decreasing SOC stability (P < 0.01). Adverse changes were observed in the lower topsoil layer. Experiment duration, straw-C input rate, and cropping system were the key factors moderating POC and MAOC stocks and SOC stability under CS (P-M < 0.05). The positive effects of CS on SOC stock and its stability diminished with duration time in the upper topsoil layer. Conversely, CS significantly decreased POC stock (- 9.2 %) and enhanced SOC stability in the lower topsoil layer (P < 0.01). Compared to CT, the highest SOC stocks and the lowest SOC stability were observed under CS in the C input range of 4-6 Mg C ha(-1) yr(-1). Our results highlight the importance of soil depth- and duration-induced differences in the accurate estimation of SOC stocks and stability dynamics under CS. The balance between SOC stock and its stability is calling for more attention.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序