数字农科院2.0

Long-term nitrogen and phosphorus addition enhances soil organic carbon stabilization by strengthening mineral-organic interactions in a temperate grassland

文献类型： 外文期刊

作者： 张昊;;姜娜;;张思宇;;王慧;;刘红梅;;赵建宁;;红梅;;张海芳;;杨殿林

关键词： microbial necromass carbon; polyvalent cations; mineral-associated organic carbon; fine soil particles; nutrient fertilization; temperate grasslands

期刊名称： Soil Ecology Letters

ISSN： 2662-2289

年卷期： 2025 年

页码：

收录情况： CSCD（2025-2026年度） ; ; 农林核心（2024版） ; ; ESCI（2025版）

摘要： Temperate grasslands represent a major component of the global carbon cycle, serving as significant carbon sinks. Much of this carbon storage occurs in the form of soil organic carbon (SOC). Microbial necromass carbon (MNC) is considered to be a major contributor to SOC in temperate grasslands. However, it remains unclear how nitrogen (N) and/or phosphorus (P) enrichment influence the formation and stabilization of mineral-associated organic carbon (MAOC) via MNC turnover and mineral-organic interactions. Here, based on a 12-year in situ nutrient addition experiment, we found that the simultaneous addition of N and P significantly increased MAOC. Although N and P addition reduced MNC, the retained high proportion of MNC within SOC and the decreased C/N ratio of mineral-associated organic matter (MAOM) directly demonstrate MNC dominance in MAOC formation. Our findings reveal that MNC is more readily enriched in finesized minerals (0–20 μm, fine silt and clay), facilitating the formation of stable MAOC. As finer fractions approach their capacity to associate with organic matter, coarser silt (20–50 μm) may represent a potential secondary sink for MNC accumulation, as indicated by their positive correlation with the proportion of MNC in SOC. This process is likely facilitated by nutrient-driven increases in ion concentrations and enhanced mineralorganic binding through metal oxide and cation complexation. Altogether, these results contribute to understanding how nutrient enrichment alters the dynamics of polyvalent cations and subsequently influences MAOC formation, highlighting the importance of mineral-organic interactions in promoting carbon sequestration and stabilization within temperate grassland ecosystems.

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