广东土壤有机碳储量及空间分布特征

Reserves and spatial distribution characteristics of soil organic carbon in Guangdong Province.

根据广东省第2次土壤普查资料,采用GIS技术估算广东省土壤有机碳储量及空间分布规律,结果表明,广东省陆地土壤有机碳储量约为17.52×10~8t。砖红壤、红壤和赤红壤的土壤有机碳密度分别为8.83、10.31和9.15kg·m^(-2),略低于全国的平均水平,三者占广东省土壤面积的67.91％;广东省黄壤和水稻土的有机碳密度分别为12.08和12.17 kg·m^(-2),高于全国平均水平;广东省平均土壤碳密度为10.44kg·m^(-2)土壤有机碳密度总的分布规律是东南沿海地区高于粤北山区,其中粤北和粤中土壤有机碳密度为5～10 kg·m^(-2),粤东的沿海地区土壤有机碳密度为10～15 kg·m^(-2),二者合计占全省土壤面积的89.24％;土壤有机碳密度主要在5～15 km·m^(-2)范围内变动。

Soil organic carbon is the main part of terrestrial carbon reservoir and important part of soil fertility. The spatial distribution and reserves of soil organic carbon are very important for studying soil carbon cycle. According to the data from the second soil survey, soil organic carbon reserves was estimated and its spatial distribution was analysed by using GIS technique. The results showed that the total amount of soil organic carbon is about 17. 52×108 t. The carbon density of laterite, lateritic red soil and red soil in Guangdong Province is 8. 83, 10.31, 9.15 kg.m-2, respectively;lower than the mean carbon density of China. The carbon density of yellow soil and rice soil is 12.08, 12.17 kg.m-2, respectively; higher than the mean carbon density of china. Soil carbon density is about 10. 44 kg . m-2 in Guangdong. The spatial distribution characteristic of soil organic carbon density in Guangdong is that the carbon density in south Guangdong Province is higher than that in north Guangdong Province, in that soil organic carbon density in north and middle Guangdong Province is 5 ~10 kg.m-2 and in east Guangdong Province is 10-15 kg.m-2. Soil organic carbon density mostly vary among 5~15 kg.m-2.