地质通报2026，Vol.45Issue(8)：1550-1562,13.DOI:10.12097/gbc.2025.01.004
内蒙古雅鲁河流域土壤有机碳空间分布特征及主控因素研究
Spatial distribution and influencing factors of soil organic carbon in the Yalu River Basin,Inner Mongolia
摘要
Abstract
[Objective]Soil organic carbon(SOC)serves as a vital component in ecosystem carbon storage,sequestration,and cycling,substantially affecting regional ecosystem functions.This study investigated the spatial distribution patterns of SOC and its influencing factors in the Yalu River Basin,eastern Inner Mongolia,by analyzing 676 topsoil samples(0~20 cm).[Methods]We employed geostatistical methods to examine the spatial distribution of SOC content and used correlation analysis,variance analysis,and regression analysis to explore how topography,land use patterns,pH,and soil nutrients(N,P,K)affect SOC spatial heterogeneity.The optimal theoretical model and spatial variation characteristics were determined through semi-variance analysis.[Results]The results showed that topsoil SOC content ranged from 1.10 g/kg to 61.20 g/kg,with a mean value of 25.54 g/kg,which was notably higher than the national average.The coefficient of variation was 0.48,indicating moderate spatial variability.Semi-variance analysis revealed that the spatial distribution of SOC was best described by an exponential model,with a nugget effect of 49.97%and a range of 63.64 km,suggesting that both structural and random factors influenced its spatial distribution with a considerable autocorrelation range.Regression analysis identified elevation and mean annual temperature as the primary environmental factors controlling SOC spatial distribution,while soil water content emerged as the most influential soil factor,followed by total nitrogen and bulk density.Path analysis further revealed that elevation exerted the strongest direct effect,total nitrogen showed the most significant direct influence among soil factors,and bulk density primarily exhibited indirect effects.[Conclusions]Through comprehensive statistical analysis,this study comprehensively elucidated the mechanisms by which environmental and soil factors influence SOC spatial distribution,offering new perspectives for understanding SOC spatial variation patterns.关键词
土壤有机碳/空间分布/统计分析/主控因素/雅鲁河流域/内蒙古Key words
soil organic carbon/spatial analysis/statistical characteristics/major factors/Yalu River Basin/Inner Mongolia分类
天文与地球科学引用本文复制引用
汪春鹏,陈彭,黄江银,马骏驰,王子彬,荆元,孙浩,孟海龙..内蒙古雅鲁河流域土壤有机碳空间分布特征及主控因素研究[J].地质通报,2026,45(8):1550-1562,13.基金项目
中国地质调查局项目《松嫩平原西北缘扎兰屯—扎赉特地区黑土地地表基质调查》(编号:DD20220856)、《海河平原 1∶25 万地表基质调查》(编号:DD20242042) Supported by China Geological Survey projects(Nos.DD20220856,DD20242042) （编号:DD20220856）
