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为了解长白山区次生林土壤有机碳空间分布特征,采用样线法对长白山区次生林土壤有机碳及其组分在土壤剖面层次、坡位和坡向的空间分布状况进行了调查。结果表明:除“东-西样线”中的东坡中层A1-2外,长白山区次生林土壤总有机碳均表现出随土壤剖面深度的增加而降低趋势。0~5cm腐殖质层土壤总有机碳含量均显著高于淀积层土壤。长白山区次生林腐殖质层土壤总有机碳含量在山体不同高度的分布受坡向影响,“东-西样线”土壤有机碳含量有随着海拔上升呈递增的趋势,“东-南样线”获得的结果与“东-西样线”的并不一致。次生林中不同山体有机碳密度之间存在明显的差异,且有机密度垂直空间的分布也因山体不同而异。综合2条样线各坡位有机碳密度来看,长白山东南部地区次生林土壤有机碳密度介于(0.6±0.1)×105~(1.6±0.2)×105 kg/hm2。
In order to understand the spatial distribution characteristics of soil organic carbon in secondary forest of Changbai Mountain, the spatial distribution of soil organic carbon and its components in the soil profile, slope position and aspect of secondary forest in Changbai Mountains was investigated by using the sample line method. The results showed that all the soil organic carbon in the secondary forest of Changbai Mountain showed a trend of decreasing with the depth of the soil profile except for the middle A1-2 in the east slope of the east-west line. Soil total organic carbon in 0-5 cm humus layer was significantly higher than that in sedimentary layer soil. The distribution of soil total organic carbon in the humus-bearing layer of secondary forest in Changbai Mountains is affected by the aspect at different altitudes. The content of soil organic carbon in the “east-west line” shows an increasing trend with elevation, The results obtained by the line "are not in accordance with the East-West line. There is a clear difference between organic carbon density in different hills in secondary forest, and the distribution of vertical density of organic density varies with different hills. According to the organic carbon density of each slope in the two sample plots, the SOC density of secondary forest in southeast Changbai Mountains ranged from (0.6 ± 0.1) × 105 to (1.6 ± 0.2) × 105 kg / hm2.