数字农科院2.0

Divergent responses of soil particulate and mineral-associated organic carbon to climate gradients in managed croplands of Northeast China

文献类型： 外文期刊

作者： Wenhao Feng;Antonio Rafael Sánchez-Rodríguez;Jie Zhou;Liang Gong;Chunrong Qian;Jia Wang;Xiaolong Bai;Pengzhi Deng;Jing Wang;Yuzhou Jiang;Hongyuan Zhang;Yuyi Li

作者机构：

关键词： Agroecosystem;Latitudinal pattern;Soil C sequestration;Soil organic carbon fractions

期刊名称： Environmental Research

ISSN： 0013-9351

年卷期： 2026 年 293 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Northeast China's croplands harbor critical soil organic carbon (SOC) reserves essential for soil fertility and food security. Partitioning SOC into particulate (POC) and mineral-associated organic carbon (MAOC) fractions advances mechanistic understanding of C cycling and enables targeted sequestration strategies. To resolve the unresolved latitudinal patterns and controls of these fractions, we analyzed 96 cropland soils spanning 40.03°–48.02° N at 0–20 cm and 20–40 cm depths. SOC and MAOC stocks increased markedly with latitude across both soil layers, whereas POC stock exhibited no visible spatial trend. Though both fractions correlated significantly with total SOC, POC stock demonstrated greater sensitivity to SOC stock changes than MAOC stock. Multivariate analyses revealed divergent drivers: 35–38 % of SOC and MAOC stocks variation in topsoil (and 27–31 % in subsoil) stemmed from interactions among climate, soil properties, and enzyme activity, whereas POC stock variation was dominated by soil properties (46 %) in topsoil and enzyme activity (28 %) in deeper strata. Random forest modeling identified mean annual temperature as the primary driver for topsoil SOC and MAOC stocks and total N for subsoil dynamics. Our findings establish temperature sensitivity and nitrogen availability as pivotal controls over SOC fraction distribution, providing actionable strategies for C management in temperate croplands under changing climates.

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