数字农科院2.0

Microbial-mediated shifts regulate the trade-off between soil organic carbon content and stability after cropland afforestation in Eastern China

文献类型： 外文期刊

作者： Jie Liu;Lin Yang;Jie Wang;Lei Zhang;Yongqi Qian;Ren Wei;Wenkai Cui;Chenghu Zhou

作者机构：

关键词： Croplands;Microbial-derived carbon;Mineral-associated organic carbon;Particulate organic carbon;Planted forests;Soil organic carbon

期刊名称： Applied Soil Ecology

ISSN： 0929-1393

年卷期： 2026 年 219 卷

页码：

收录情况： SCIE（2025版）

摘要： Cropland soil organic carbon (SOC) is a vital component of the global carbon cycle. At the same time, the expansion of adjacent planted forests, driven by their ecological benefits, further shapes regional carbon dynamics. This offers a pivotal research opportunity to investigate divergences in SOC and its fractions, as well as carbon formation and stabilization mechanisms in croplands and planted forests converted from croplands. Elucidating divergent influencing mechanisms of SOC and its fractions between croplands and planted forests is critical to deciphering different land-use impacts on carbon storage and optimizing land-use-specific carbon sequestration management under global warming. We collected 39 paired cropland-planted forest soil samples in a major grain-producing region of Eastern China, and used piecewise structural equation modeling and random forest modeling to quantify and compare the effects of physical carbon parameters, microbial-derived carbon (MDC), and biotic-abiotic drivers on SOC and its fractions between croplands and adjacent planted forests. Croplands exhibited significantly higher SOC, particulate organic carbon (POC), and mineral-associated organic carbon (MAOC) contents than planted forests, exceeding forest levels by 34%, 68%, and 25%, respectively. Compared to planted forests, croplands had a higher POC proportion but a lower MAOC proportion. Furthermore, the dominant drivers of SOC, POC, and MAOC shifted from biotic factors in croplands to abiotic factors in planted forests. Dissolved organic carbon (DOC) exhibited a stronger positive contribution to SOC accumulation in croplands than in planted forests. Fungal necromass carbon (FNC) contributed more to SOC, POC, and MAOC than bacterial necromass carbon (BNC) in croplands, but the opposite was true in planted forests. Collectively, planted forests exhibited lower but more stable SOC compared to croplands, demonstrating greater sensitivity to abiotic drivers and stronger MAOC dominance (constituting 78.85% of total SOC). Conversely, cropland SOC was primarily regulated by biotic drivers and MDC inputs. Therefore, land-use-specific management is essential to maximize the complementary carbon sequestration potentials of croplands and planted forests, thereby enhancing global SOC accumulation and stabilization.

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