江西省典型森林类型土壤碳贮量及碳汇能力研究

Study on soil organic carbon storage and carbon sequestration of main forest type in Jiangxi province

基于全国林业碳汇监测与计量体系的建立,采用野外调查、取样和室内实验分析相结合的方法,研究了江西省4种森林类型土壤碳贮量及碳汇能力分布特征,结果表明：4种森林类型土壤有机碳含量与有机碳密度表现出相似的规律,从大到小依次为阔叶林＞杉木林＞针阔混交林＞松木林,森林土壤平均有机碳密度15.69（±10.28）kg/m2,低于我国森林土壤有机碳密度19.36 kg/m2的平均水平,其中阔叶林的土壤有机碳密度最大,其平均碳密度分别是另外3种森林类型的1.2～1.8倍;4种森林类型土壤有机碳密度、土壤有机碳含量及其差异程度均随土壤深度的增加而减少,0～30 cm土层土壤有机碳密度分别占整个剖面的50％左右,0～10 cm土层土壤有机碳含量为10～30 cm土层的1.7～2.3倍,为30～100 cm土层的3～4倍;森林土壤碳贮量占整个森林生态系统总碳贮量的73.72％～79.08％,在森林生态系统碳循环中具有重要的地位和作用.

Based on the establishment of a national forest carbon monitoring and measuring system, the combined methods of field investigation, sampling and laboratory analysis were used to analyze the soil organic carbon storage and carbon sequestration of 4 main forest types in Jiangxi province. The results showed that, soil organic carbon contents and densities of 4 main forest types showed a similar pattern, and the order was broad-leaved forest〉 fir forest〉 mixed forest〉 pine forest. The average forest soil organic carbon density, 15.69 （±10.28） kg/m2, was lower than that of our country＇s average level which was 19.36 kg/m2. And the broad-leaved forest had the biggest soil organic carbon density, being 1.2- 1.8 times of the other 3 forest types. The soil organic carbon densities, contents and the variations f 4 main forest types decreased with the soil depth, showing soil organic carbon density in 0-30 cm accounting for about 50% of the whole section, 0~10 cm soil layer depth of soil organic carbon content being 1.7-2.3 times of 10-30 cm soil layer and 3-4 times of 30-100 cm soil layer. Forest soil carbon storage accounted 73.72%-79.08% of the forest ecological system, and had an important status and role.