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为深入探讨土壤碳库的空间变异特征、准确评价区域碳库的影响机制,选择内蒙古自治区赤峰市敖汉旗黄花甸子流域为研究对象,基于研究区的实地采样数据,结合遥感与地理信息系统技术,采用地理加权回归模型对土壤有机碳密度及其影响因子进行拟合,探求不同环境因子对土壤有机碳密度影响的空间变异特性。结果表明,研究区土壤有机碳密度在1.91~16.63 kg/m2范围内变化,其平均密度为7.42 kg/m2;各影响因子对土壤有机碳密度的影响程度由高到低依次为海拔>坡度>归一化植被指数(NDVI)>与道路或村庄最短距离(DIST);各因子对土壤有机碳的影响随空间位置的变化存在明显的差异,其中海拔、坡度与土壤有机碳密度呈现负相关,而NDVI、DIST与土壤有机碳密度呈现正相关。
In order to further explore the spatial variability of soil carbon pool and accurately evaluate the impact mechanism of regional carbon pools, the Huanghuadian Subbasin of Aohan Banner, Chifeng City, Inner Mongolia Autonomous Region was chosen as the research object. Based on the field sampling data of the study area and the combination of remote sensing and geographic information system The spatial variability of soil organic carbon density by different environmental factors was explored by using the geographical weighted regression model to fit the soil organic carbon density and its influencing factors. The results showed that the density of soil organic carbon in the study area varied from 1.91 to 16.63 kg / m2 with an average density of 7.42 kg / m2. The impact of various influencing factors on soil organic carbon density from high to low was in the order of elevation> slope> (NDVI) and shortest distance between roads and villages (DIST). The effects of different factors on soil organic carbon (SOC) were significantly different with the changes of spatial locations. Altitude and slope were negatively correlated with soil organic carbon (SOC) NDVI and DIST have a positive correlation with soil organic carbon density.