退耕还林杉木林地土壤有机碳储量变化特征——以贵州兴义市三江口镇为例  

Variation of Soil Organic Carbon Storage in Fir Forests under the Grain for Green Program—Take Sanjiangkou,Xingyi of Guizhou Province as an Example

作　　者：和学智 陈先刚[1] 张瑞[1] 李鑫[1] 王艳霞[1] 姜磊[1] 

机构地区：[1]西南林业大学环境科学与工程学院,昆明650224

出　　处：《林业资源管理》2015年第2期95-99,共5页Forest Resources Management

基　　金：国家自然科学基金(41263008)

摘　　要：为了解我国西南喀斯特地貌区退耕还林工程主要林分土壤碳储量变化，选取贵州省兴义市三江1：2镇退耕还林工程杉木林为研究对象，并以耕地为对照，对不同林龄及耕地的土壤有机碳储量进行了测定及分析。结果表明：各土层（0～20cm，20～40cm，40～60cm）土壤容重的年际变化除表层略有波动外均随林龄的增长而减少，0～60cm深度整层土壤容重随林龄增长年均减少4．27％，各层间土壤容重随土层加深而增加，不同林龄间增量各异；0～60cm深度内土壤有机碳储量在造林后5年内随林龄增长而减少，平均每年下降9．27％；5年后随林龄增长而增加，平均每年增加8．44％，但在退耕还林后11年土壤有机碳储量未能恢复到耕地水平；土壤有机碳含量及储量在垂直方向上均呈现随土层加深而减少，不同林龄间差异明显，其年际变幅也随土层加深而减少。To get more information about the impact of the Grain for Green Program on soil organic carbon pool,soil samples were collected,and analyzed from the fir forest in Sanjiangkou township,Xingyi of Guizhou Province,including cropland and six stands with the different ages.The result shows that the soil bulk density decreases with stand age by annual rate of 4.27% in 0 ~60cm layer.The soil bulk density increases with the soil layer deeper.The soil organic carbon storage in fir forests decreases with stand age by annual rate of 9.27% in the first 5 years after afforestation,and increases by annual rate of 8.44%from 6 to 11 years.But the soil organic carbon storage in the fir forest has not reached that level in farm-land at the 11 year after afforestation.The soil organic carbon storage in fir forests decreases with the soil layer deeper.

关 键 词：退耕还林 杉木 土壤 有机碳储量 

分 类 号：S714[农业科学—林学] S791.27