内蒙古自治区土壤有机碳、氮蓄积量的空间特征

采用全国策二次土壤普查中内蒙古自治区的典型土种剖面资料，在剖面深度的基础上，用地统计学和地理信息系统(GIS)方法，分别按土壤类型和土地覆被类型计算了土壤有机碳、氮密度，分析了内蒙古自治区土壤有机碳、氮蓄积量的空间分布特征，探讨了土壤有机碳、氮蓄积量与主要气候要素的关系．结果表明，内蒙古自治区土壤有机碳密度处于3．24—43．24kg·m^-3之间，土壤有机氮密度处于269．56—3085．60g·m^-3之间，土壤碳、氮比(C／N)大致在4．46—17．13之间．土壤有机碳、氮密度与温度呈负相关，相关系数分别为0．557和0．460(n＝245)；与年均降水量呈正相关，但相关性不是很强，相关系数分别为0．285和0．203．从内蒙古自治区东北地区到西南地区，土壤有机碳、氮蓄积量随着温度递升和降水量递减呈现降低的趋势。

Spatial characteristics of soil organic carbon and nitrogen in Inner Mongolia

Studies on the amount and spatial distribution of soil organic carbon/nitrogen in Inner Mongolia and their relationship to main climate factors showed that the content of soil organic carbon and nitrogen was 3.24-43.24 kg.m-3 and 269.56-3085.60 g.m-3, respectively, and the C/N ratio was about 4.46-17.13. The correlation between soil organic carbon/nitrogen and temperature was negative, and R was 0.557 and 0.460, respectively. Soil organic carbon/nitrogen had a weak positive correlation to precipitation, and R was 0.285 and 0.203. Soil organic carbon and nitrogen appeared a reducing trend with increasing temperature and decreasing precipitation from northeast to southwest.