东北地区土壤活性有机碳对水热梯度变化的反映S152.4+2S153.6

基于样区20年气象资料统计结果和2006年土壤有机碳实测值,分析了东北样区内土壤活性有机碳各组分的空间分布格局及其与年均温(t)、降雨量(p)、有效积温和p/t(降雨量/年均温)之间的关系。结果表明:样区内土壤活性有机碳各组分沿纬度呈现出南低北高的分布趋势;活性有机碳各组分与土壤有机之间具有显著的正相关性;活性有机碳组分之间具有较强的相关性;活性有机碳各组分与气候因素之间存在良好的相关性。活性有机碳各组分与年均温之间的相关性大于活性有机碳各组分与降雨量之间的相关性。

Response of Active Soil Organic Carbon to Gradients of Precipitation and Temperature in the Northeastern Area of China

The spatial distribution patterns of the fractions of the active organic carbon, and the relationships between the fractions of the active organic carbon and mean annual temperature（MAT）,and precipitation（P）, effective accumulation temperature （EAT） and P/t （the ratio of precipitation to mean annual temperature）were studied in Soils in Northeastern China. The results showed that the contents of the fractions of active organic carbon enhanced with the increase of latitude and the significant active relationships were found among the contents of the fractions of the active organic carbon and SOM. So it was among the fractions of active organic carbon and temperature and precipitation. The significance relationship between the fractions of active organic carbon and MAT was stronger than that between the fractions of active organic carbon and P coefficient of correlation.