海南吊罗山自然保护区土壤有机碳贮量研究

Soil Organic Carbon Storage of Diaoluoshan Natural Reserve in Hainan

以海南吊罗山自然保护区15个样地土壤剖面为对象，分析其土壤有机碳含量、有机碳密度及其碳贮量．以期揭示吊罗山自然保护区土壤有机碳分布特征．初步估算吊罗山自然保护区土壤有机碳贮量。结果显示：（1）吊罗山各样地土壤有机碳含量及碳密度随土壤深度增加而减少，平均有机碳含量为16．86g／kg，平均有机碳密度为15．31kg／m2。（2）同一土层不同样地问的土壤有机碳含量存在着较大的差异．主要表现在土壤表层，并随土层深度的增加差异逐渐变小。（3）吊罗山土壤有机碳含量与土壤深度呈极显著负相关．最佳拟合曲线模型是幂函数．回归方程为v=113．796x-0．6，相关系数为0．836。（4）吊罗山自然保护区在0～100cm土层的土壤总有机碳贮量约为281．64万t．土壤表层所贮存的有机碳量的比重与全球平均水平差异较小。

Soil organic carbon（SOC）, organic carbon density and organic carbon storage were analyzed in 15 plots soil profiles in Diaoluoshan Natural Reserve （DNR） of Hainan Island, to discover its soil organic carbon distribution characteristic, as well to preliminarily estimate soil organic carbon storage in DNR. Results showed that： （1）The vertical distribution of soil organic carbon concentration and density generally decreased with soil depth. The average organic carbon concentration and density were 16.86 g/kg and 15.31 kg/m2. （2） The organic carbon concentration in different places of same layer had significant difference, which mainly appeared in soil surface and gradually getting smaller with soil depth. （3）There was significantly negative correlation between soil organic carbon concentration and soil depth, the best fitting curve model was a power function, the regression equation was y=113.796x-0.6, and the correlation coefficient was 0.836. （4）The total organic carbon storage in the soil layer 0-100 cm of DNR was around 2.816 4 million ton, and the proportion of soil organic carbon storage in soil surface was minor difference to global average level.