数字农科院2.0

.Competitive equilibrium between carbon loss and sequestration driven by erosion: Stratified responses of microbial metabolism and mineral protection.

文献类型： 外文期刊

作者： Mengni Li; Yulong Shi; Runyu Xue; Jeroen Meersmans; Qingwen Zhang

关键词： Soil erosion;Carbon fractionation;Microbial carbon use efficiency;Carbon mineralization;Sediment selectivity

期刊名称： CATENA

ISSN： 0341-8162

年卷期： 2026 年

页码：

收录情况： SCIE（2025版）

摘要： Soil erosion drives the redistribution of soil organic carbon (SOC) through transportation and deposition processes, yet its underlying mechanisms in shaping the carbon source/sink patterns on slopes remain inadequately understood. Prevailing studies have predominantly focused on the physical translocation effects of erosion, overlooking the biologically-driven priming mineralization. The differential transport and burial of particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) induced by erosion may form a physical carbon sink; however, the synergistic mechanisms between physical protection and biological metabolic processes are still unclear. To address this critical knowledge gap, this study investigated a gentle slope in the Black Soil Region of Northeast China. We measured the contents of SOC fractions (SOC, POC, and MAOC), soil extracellular enzyme activities (BG, and NAG+LAP), and microbial carbon use efficiency (CUE) in topsoil (0–20 cm) and subsoil (20–40 cm) layers along typical upper and lower slope positions. Partial least squares path modeling (PLS-PM) analysis results indicated that the upper zones suffered from a loss of labile POC due to selective erosion, leading to microbial substrate scarcity and a decline in CUE, thereby exacerbating carbon loss. In contrast, lower zones facilitated the enrichment of stable MAOC through mineral protection mechanisms, concomitant with an increase in CUE, creating a local carbon sink. Simultaneously, the vertical migration of carbon contributed to the formation of a relatively stable MAOC pool in the subsoil, partially offsetting erosioninduced carbon release. This study reveals that the redistribution of particulate organic carbon (POC) and mineral-associated organic carbon (MAOC) across eroded landscapes, coupled with microbial metabolic adaptation, governs the carbon source/sink dynamics along the slope. Future assessments of the carbon budget under soil erosion must concurrently quantify the losses from physical translocation and the sequestration driven by mineral-biological synergy to systematically decipher the response pathways of the carbon cycle to erosion.

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