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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

作者： Jiang, Rui 1 ; Liu, Shuai 2 ; Jiang, Fahui 3 ; Guo, Zichun 2 ; Adingo, Samuel 2 ; Chen, Zengming 2 ; Gao, Lei 2 ; Peng, Xinhua 1 ;

作者机构： 1.Jiangxi Agr Univ, Key Lab Agr Resources & Ecol Poyang Lake Watershed, Minist Agr & Rural Affairs China, Nanchang 330045, Peoples R China

2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

3.Anhui Acad Agr Sci, Soil & Fertilizer Res Inst, Key Lab Nutrient Cycling & Resource Environm Anhui, Hefei 230031, Peoples R China

4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

5.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, State Key Lab Efficient Utilizat Arable Land China, Beijing 100081, Peoples R China

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.

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