洞庭湖流域土壤溶解性有机碳的空间分布及影响因素

doi:10.13287/j.1001-9332.202504.012

摘要/Abstract

摘要： 土壤溶解性有机碳(DOC)是陆地碳库的重要组成部分,其空间分布特征对调控区域固碳增汇具有重要意义。本研究以洞庭湖流域为研究区域,结合地统计学、相关性分析和GIS技术,分析了表层土壤(0～10 cm)DOC空间分布特征及其与土地利用类型、土壤理化特性和地形等环境变量的相关性。结果表明: 1)洞庭湖流域土壤DOC含量为4.31～271.29 mg·kg^-1,均值为78.46 mg·kg^-1,变异系数为52.1%,属中等变异水平。2)土壤DOC整体上呈斑块状分布和自南向北递减特征,具中等强度的空间自相关性,受结构性因子和随机性因子的共同作用,在45°、90°和135°方向上变异程度较高。3)土地利用方式、降雨量、坡度、土壤有机碳、总氮、阳离子交换量与DOC具有显著相关性,土壤理化特性和土地利用方式是影响土壤DOC空间分异的主控因子,解释率分别为23.7%和22.8%。研究结果可为洞庭湖流域土壤碳汇管理、碳循环平衡提供科学依据。

关键词: 洞庭湖流域, 土壤溶解性有机碳, 空间分布, 土地利用方式, 影响因素

Abstract: Soil dissolved organic carbon (DOC) is a crucial component of terrestrial carbon pool, and its spatial distribution characteristics are of significant importance for the regulation of regional carbon sequestration and the enhancement of carbon sink. Taking the Dongting Lake Basin as the research area, by utilizing geostatistics, correlation analysis, and GIS technology, we analyzed the spatial distribution of topsoil (0-10 cm) DOC and its correlation with environmental variables, including land use types, soil physicochemical properties, and topography. The results showed that: 1) Soil DOC content in the Dongting Lake Basin ranged from 4.31 to 271.29 mg·kg^-1, with an average value of 78.46 mg·kg^-1 and a coefficient of variation of 52.1%, indicating a moderate level of variability. 2) Soil DOC generally exhibited a patchy distribution with a decreasing trend from south to north, showing a moderate spatial autocorrelation with higher variability in the 45°, 90°, and 135° directions due to the joint influences of structural and random factors. 3) Land use patterns, rainfall, slope, soil organic carbon, total nitrogen, and cation exchange capacity were significantly correlated with DOC. Soil physicochemical properties and land use patterns were the main controlling factors affecting the spatial differentiation of soil DOC, with explanation rates of 23.7% and 22.8%, respectively. Our findings would provide a scientific basis for soil carbon sink management and carbon cycle balance in the Dongting Lake Basin.

Key words: Dongting Lake Basin, soil dissolved organic carbon, spatial distribution, land use pattern, influencing factor

段康宁, 黄金权, 刘纪根, 孔赟, 刘小岚, 李威闻, 张露. 洞庭湖流域土壤溶解性有机碳的空间分布及影响因素[J]. 应用生态学报, 2025, 36(4): 1171-1178.

DUAN Kangning, HUANG Jinquan, LIU Jigen, KONG Yun, LIU Xiaolan, LI Weiwen, ZHANG Lu. Spatial distribution and influencing factors of soil dissolved organic carbon in Dongting Lake Basin[J]. Chinese Journal of Applied Ecology, 2025, 36(4): 1171-1178.

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