杉木林采伐迹地的土壤有机碳分配特征

Distribution characteristics of soil organic carbon in cutover land of a Cunninghamia lanceolata stand

以杉木林采伐迹地为对象，比较上坡、中坡和下坡的土壤碳分配以及0—20cm、20～40cm和40～60cm土层的土壤碳垂直分布，研究了不同坡位和土层对固碳功能的影响。结果表明，采伐迹地各土层的有机碳含量均为下坡〉中坡〉上坡，各坡位的土壤有机碳含量均随土层深度的增加而减少。土壤有机碳密度为下坡〉中坡〉上坡，随土层加深而减少，0—20cm土层有机碳密度分别为20～40cm和40～60cm土层的1．37倍和1．78倍。

Taken cutover land of a Cunninghamia Lanceolata stand as the research object, soil organic carbon in upper, middle and lower slope positions, 0-20 cm, 20-40 cm and 40-60 cm soil layers was studied. The resuits showed that soil organic carbon content in all soil layers was in the order of lower slope 〉 middle slope 〉 upper slope, and it decreased with increasing soil depth at each slope. The order of the soil organic carbon density was lower slope 〉 middle slope〉 upper slope, and it decreased with increasing soil depth at each slope. The soil organic carbon density of 0-20 cm soil layer was 1.37 times and 1.78 times of 20-40 cm and 40-60 cm soil layers, respectively.