基于地理探测器的中国陆地生态系统土壤有机碳空间异质性影响因子分析

中国陆地生态系统土壤有机碳库对全球生态系统碳平衡具有显著影响.为揭示土壤碳库空间分布的潜在主控因子并为今后建立碳库空间分布模型提供依据,利用地理探测器对中国陆地生态系统表层土壤(0—20 cm)有机碳密度的影响因子(气温、降水量、DEM、NDVI、陆地生态系统类型、人口密度)进行空间分异性探测和定量归因.结果表明:自然...

Influential Factors Analysis for Spatial Heterogeneity of Soil Organic Carbon in Chinese Terrestrial Ecosystem with Geographical Detector

Soil organic carbon pool in terrestrial ecosystem in China has a significant impact on the global ecosystem carbon balance.In order to explore potential dominant factors of the spatial distribution of soil carbon pool and provide the basis for establishing the spatial distribution model of soil carbon pool in the future,the influential factors(temperature,precipitation,DEM,NDVI,terrestrial ecosystem types,population density)of spatial heterogeneity of soil organic carbon density on the surface(0?20 cm)in terrestrial ecosystem in China were detected and quantitatively attributed by the geographic detector.The results show that natural factors are dominant factors of soil organic carbon density in large scale or medium scale terrestrial ecosystems,but human factors have little influence.The explanatory power of each influential factor in large scale is as follows:temperature(0.22),NDVI(0.16),DEM(0.12),terrestrial ecosystem types(0.09),precipitation(0.06),population density(0.04).Climate is the primary factor influencing the spatial heterogeneity of organic carbon density in topsoil of terrestrial ecosystems in China,especially temperature.The explanatory power of the interaction between temperature and precipitation is 0.37.The temperature factor is negatively correlated with soil organic carbon in relatively cold regions(mean temperature<15℃),but positively correlated with soil organic carbon in hotter regions,indicating that the carbon balance of the ecosystem may show heterogeneous response characteristics to future climate warming.The spatial heterogeneity of soil organic carbon density in terrestrial ecosystems in China is influenced by multiple factors rather than a single factor.The interpretation degree of the influencing factors of soil organic carbon density in terrestrial ecosystems surface in the six regions(Northeast,North,East,Northwest,Central-South and Southwest)is different,which indicates that the main controlling factors of soil organic carbon density have spatial heterogeneity.