地质通报2026，Vol.45Issue(5)：818-836,19.DOI:10.12097/gbc.2024.10.051
松嫩平原北部地表基质表层土壤有机碳密度空间分布及影响因素
Spatial distribution of topsoil organic carbon density and its affecting factors in the ground substrate of the Northern Songnen Plain
摘要
Abstract
[Objective]The Northern Songnen Plain,recognized as China's primary black soil resource distribution area and a crucial commercial grain production base,was systematically investigated to characterize the spatial distribution patterns and driving factors of topsoil soil organic carbon density(SOCD,0～20 cm depth).This study provides critical datasets to advance regional soil carbon cycling research,with direct implications for achieving China's"Dual Carbon Goals"and promoting the region's agricultural economic sustainability.[Methods]This study focuses on Wudalianchi City and Nenjiang City as representative study areas.Utilizing 1174 soil samples collected through field surveys(2022-2023),the density,stock,and spatial distribution characteristics of topsoil organic carbon were systematically quantified using geostatistics and ArcGIS analysis techniques.Advanced statistical approaches,integrating Pearson's correlation analysis with random forest regression modeling were implemented to elucidate the correlation and relative importance of driving factors.[Results](1)The 2023 SOCD in the study area ranged from 6.00 kg/m2 to 9.00 kg/m2(mean=6.32 kg/m2),yielding a total soil organic carbon stock(SOCR)of 145.02 Tg;(2)Spatial analysis revealed a west-to-east increasing gradient with moderate positive autocorrelation(Moran's I=0.228).The optimal interpolation was achieved using an exponential semi variogram model,with structural factors dominating spatial heterogeneity;(3)Significant positive correlations were observed between SOCD and mean annual precipitation(r=0.38),altitude(r=0.19),soil C/N ratio(r=0.56)and N/P ratio(r=0.38),whereas effective accumulated temperature(≥10℃,r=-0.19)exhibited negative association(all P<0.001).(4)Random forest modeling identified mean annual precipitation(38.40%relative importance)and effective accumulated temperature(22.04%)as primary drivers,followed by altitude(17.22%),pH(9.26%),ground substrate configuration(7.23%),and slope(1.32%).[Conclusions]The spatial distribution of topsoil organic carbon density in the Northern Songnen Plain demonstrates positive spatial clustering.Terrain attributes,climatic conditions,and soil physicochemical properties are closely linked to SOCD variations.Climatic factors(mean annual precipitation and effective accumulated temperature)emerge as the dominant controlling factors,followed by altitude,whereas pH,ground substrate configuration and slope exert relatively weaker effects.关键词
松嫩平原/地表基质/土壤有机碳密度/土壤有机碳储量/空间分布/影响因子/地质调查工程Key words
Songnen Plain ground substrate/ground substrate/soil organic carbon density/soil organic carbon stock/spatial distribution/influencing factors/geological survey engineering分类
天文与地球科学引用本文复制引用
吴怡慧,张明,王鑫磊,任广智,梁中恺,周传芳,李双异,张旭东,李少文,宋昊南,孙玉雪,赵国强..松嫩平原北部地表基质表层土壤有机碳密度空间分布及影响因素[J].地质通报,2026,45(5):818-836,19.基金项目
中国地质调查局项目《东北多年冻土区1∶25万地表基质调查》(编号:DD20242507) Supported by China Geological Survey Project(No.DD20242507) （编号:DD20242507）
