生态环境学报2025，Vol.34Issue(11)：1715-1727,13.DOI:10.16258/j.cnki.1674-5906.2025.11.005
湟水河流域耕地土壤团聚体有机碳空间变异特征及其驱动因素分析
Characteristics of Spatial Variation of Organic Carbon in Cultivated Soil Aggregates in Huangshui River Basin and Analysis of Its Driving Factors
摘要
Abstract
As the basic unit of soil,the formation and stability of soil aggregates are closely related to soil organic carbon(SOC)content.Previous studies have mainly focused on the spatial variation characteristics and driving factors of a single soil aggregate or organic carbon.Few studies have investigated the spatial variation characteristics of all soil aggregate components and their associated organic carbon and analyzed the main driving factors.Therefore,in this study,the Huangshui River Basin in the northeastern part of the Tibetan Plateau was selected as the study area,and 84 arable land sample sites were established.Soil samples were collected from the 0‒20 cm and 20‒40 cm soil horizons to determine arable land soil organic carbon,soil aggregate fractions,and their related organic carbon.The half-variance function,kriging interpolation,and bias-variance function were used to integrate the soil physicochemical and geographic environmental factors.The spatial variation characteristics were analyzed using the half-variance function,Kriging interpolation,and partial least squares structural equation model,and the main controlling factors affecting the spatial distribution characteristics were identified and evaluated.The results of the study showed that 1)soil aggregates in the watershed showed moderate variability,whereas soil organic carbon showed high variability.2)Geostatistical analyses showed that as the particle size of aggregates decreased(from macro-aggregates and micro-aggregates to powdery and sticky grains),the abutment values of soil aggregate fractions and the organic carbon within them decreased,and spatial autocorrelation weakened.3)The kriging interpolation results indicated that the spatial distribution patterns of soil aggregate fractions and organic carbon were similar,generally decreasing from the northwest to the southeast region.4)Combined with Spearman's correlation analysis and partial least squares structural equation model,we found that soil and topographic factors are the most important direct and indirect driving factors for the spatial variability of soil aggregate fractions and organic carbon in cultivated land in the Huangshui Basin.Among them,soil texture was the most important control factor affecting the spatial variability of soil aggregates and their organic carbon,and topographic factors had the most important indirect effect on the organic carbon of aggregates through soil factors,which weakened with the increasing soil depth.Therefore,the study of Huangshui River Basin cultivated land in the soil agglomerates and their organic carbon interaction mechanism on the basis of the analysis of their spatial heterogeneity and its driving factors,alpine agriculture,and animal husbandry areas to prevent soil degradation,optimize the land management and maintenance of arable land productivity,regional ecological and environmental effects of the assessment and management to provide a certain theoretical basis.关键词
湟水河/土壤团聚体/有机碳/空间变异/影响因素Key words
Huangshui River/soil aggregates/organic carbon/spatial variability/influencing factor分类
农业科技引用本文复制引用
孔小云,赵家艺,冯玲正,周燕,张永坤,李润杰,李颖,林成清,马占明,辛继林,杨晓璇,党怡乐..湟水河流域耕地土壤团聚体有机碳空间变异特征及其驱动因素分析[J].生态环境学报,2025,34(11):1715-1727,13.基金项目
国家自然科学基金项目(42207375 （）
2024-SF-148) （）
