马鬃岭自然保护区土壤碳蓄积的研究

以金寨马鬃岭自然保护区为研究对象,布置56个采样点,分析该区森林土壤有机碳质量分数时空分布特征和碳储量。结果表明：研究区有机碳含量丰富,随着土壤深度、植被类型、海拔高度的变化而变化。0~20cm土层有机碳质量分数最高为90.88 g·kg-1,平均为32.47 g·kg-1,土壤有机碳质量分数随着深度的增加而递减,表层有机碳变化幅度高于深层土壤,不同测点递减的程度不同;有机碳质量分数随海拔高度的增加呈递增趋势;土壤有机碳质量分数存在明显的季节变化,表层土壤秋季有机碳质量分数最高,冬春季次之,夏季最低,越往表层季节变化越明显。0~20 cm土层有机碳密度平均为6.52 kg.m-2,0~100 cm土层有机碳平均密度为23.26 kg.m-2,有机碳密度分布与有机碳质量分数分布基本一致。0~20 cm土层土壤碳储量为2.258×105~2.265×105 t,0~100 cm土层土壤碳储量为6.91×105~8.76×105 t,碳储量丰富。最后提出该自然保护区封山育林,对温室气体减排意义重大。

Studies on soil organic carbon storage in Mazongling natural conservation zone

56 samplical points were selected in Mazongling Natural Conservation Zone in order to analyse the foresty soil organic carbon content and its spatial-temporal distribution of there.The results showed that the distribution of soil organic carbon content in forest varies with soil depth,different vegetation types,and altitude.The highest soil organic carbon content was 90.88 g·kg-1 in 0-20 cm soil layers,the average was 32.47 g·kg-1,Organic carbon content was decreased with increasing depth,changes in organic carbon was higher in topsoil than deep,it was different for different points.Organic carbon content increased with altitude.The change of higher altitude organic carbon content was slow,the lower was big for human impact.The seasonal variation was obviously.Forest soil organic content of topsoil was highest in autumn,the spring and winter were next best,in summer was lowest.The organic carbon density of 0-20 cm of forest soil was 6.52 kg·m-2,and the organic carbon density of 100 cm of forest soil was from 25.26 kg·m-2.The organic carbon density in the natural conservation zone was higher than the surrounding zone.The carbon storage was from 2.26×105-2.65×105 t in 0-20 cm soil layers,it was 6.94×105-8.65×105 t in 0-100 cm.Carbon storage potential of the natural conservation zone is full,so closed forest is significance.