雷州半岛土壤碳储量及其有机碳时空变化规律

区域土壤有机碳调查在全球土壤碳循环的研究中具有重要作用。通过开展土地质量地球化学调查,获得了雷州半岛土壤全碳和有机碳数据。土壤碳储量计算结果显示雷州半岛土壤有机碳总体分布特征如下:表层(0~0.2m)土壤有机碳储量为4.41×10^7t,碳密度为3.39kg/m^2;中层(0~1.0m)土壤有机碳储量为1.57×10^8t,碳密度为12.08kg/m^2;深层(0~1.8m)土壤有机碳储量为2.31×10^8t,碳密度为17.74kg/m^2。雷州半岛土壤碳密度略高于全国平均水平,与第二次土壤普查比较,33年间雷州半岛表层土壤有机碳密度和有机碳储量有所增加,增加幅度为26.81%,其增加趋势及强度在空间上具有较大差异,其中农用地和林地这两种利用类型土壤有机碳的改变是影响区域土壤有机碳储量的主要因素。

Spatial and Temporal Variation of Soil Carbon Storage and Organic Carbon Content in Leizhou Peninsula,Guangdong Province

Regional soil organic carbon survey plays an important role in the study of global soil carbon cycle. The total carbon and organic carbon content of soil in Leizhou Peninsula were obtained by geochemical survey of land quality. The results of soil carbon storage calculation show that the total distribution of soil organic carbon in Leizhou Peninsula is as follows: surface (0-0.2 m) soil organic carbon storage is 4.41×10^7 ton, carbon density is 3.39 kg/m^2;middle (0-1.0 m) soil organic carbon storage is 1.57 ×10^8 ton, carbon density is 12.08 kg/m^2;deep (0-1.8 m) soil organic carbon storage is 2.31×10^8 ton, carbon density is 17.74 kg/m^2. The soil carbon density in Leizhou Peninsula is slightly higher than the national average level. Compared with the second National Soil Survey, the organic carbon density and storage in the surface soil of Leizhou Peninsula increased by 26.81% in 33 years, and their increasing trend and intensity are quite different in space. The change of soil organic carbon in agricultural land and forest land is the main factor affecting the soil organic carbon storage.