退耕还林不同树种土壤有机碳积累特征对比研究

Comparative Study on Soil Organic Carbon Accumulation Characteristics of Different Tree Species in Conversion of Farmland to Forest

为探讨退耕还林不同树种林地土壤有机碳积累特征,运用相关性分析研究了云南省宣威市和贵州省兴义市不同退耕还林年限的柳杉林和杉木林地土壤有机碳含量特征及其主要影响机制。结果表明:退耕还林不同树种林地0~60 cm土层平均土壤有机碳含量均随林龄的增大先减后增,退耕还林杉木林地5a龄时最低,5a后随着林龄的增大又逐渐增加。

In order to explore the characteristics of soil organic carbon accumulation in diff erent tree species of forest land converted from farmland to forest,correlation analysis was used to study the characteristics of soil organic carbon content in Cryptomeria lanceolata and Cunninghamia lanceolata forest land with diff erent years of conversion from farmland to forest in Xuanwei City,Yunnan Province and Xingyi City,Guizhou Province,and its main impact mechanism.The results showed that the average soil organic carbon content in 0~60cm soil layer of diff erent tree species forest land converted from farmland to forest decreased at fi rst and then increased with the increase of forest age,and the soil organic carbon content in Chinese fi r forest land converted from farmland to forest was the lowest at the age of 5 years,and then increased gradually with the increase of forest age after 5 years.