陇中黄土高原土地利用变化对土壤有机碳、无机碳的影响  

The Impact of Land Use Change on Soil Organic Carbon and Soil Inorganic Carbon Contents at Loess Plateau in Longzhong

作　　者：张丽华[1] 谢忠奎[1] 王亚军[1] 郭志鸿[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,皋兰生态与农业综合试验站,甘肃兰州730000

出　　处：《土壤通报》2013年第2期369-375,共7页Chinese Journal of Soil Science

基　　金：中国科学院寒区旱区环境与工程研究所青年人才成长基金(No.Y084941);中国科学院知识创新工程重要方向项目(KSCX2-EW-B-1-4)资助

摘　　要：通过对陇中黄土高原5种典型土地利用方式土壤理化性状、土壤有机、无机碳含量和碳酸盐的6C值的分析表明，（1）荒漠草原开垦、栽植人工林后，土壤砂粒含量减少、粉粒增加，以荒漠草原开垦变化显著；pH值降低，以荒漠草原栽植人工林变化显著；电导率均显著降低。退耕还草、弃耕后砂粒含量增加、粉粒减少，pH值升高，均以耕地弃耕后变化显著；退耕还草后电导率显著降低。（2）荒漠草原开垦、退耕还草、弃耕后0—100cm土壤有机碳含量增加，天然植被栽植人工林后土壤有机碳降低，其中，退耕还草引起土壤有机碳显著变化。（3）荒漠草原转变为人工林、耕地后1m深土壤无机碳含量显著下降，而耕地弃耕或退耕还草后土壤无机碳的下降未达到显著水平。土地利用类型之间土壤无机碳含量的垂直分布、碳稳定同位素也存在一定差异。The （AL）, artificial soil organic carbon, soil inorganic grassland （AG）, artificial woodland analyzed in the Longzhong part of Loess Plateau carbon contents and the 813C values of carbonates at the arable land （AW）, abandoned arable land （AAL） and desert grassland （DG） were in Northwest China. The results showed that from DG to AL or AW, the sand contents decreased and silt increased, and the variations were significant in the former conversion; soil pH decreased, being significantly different in the latter; land use conversion and electrical conductivity （EC） were both decreased significantly. From AL to AG or AAL, the sand content increased, silt decreased and pH increased. These changes were significant from AL to AG. The EC also decreased significantly from AL to AG. The conversions from DG to AL, AL to AG and AL to AAL increased soil organic carbon contents at 0 - 100 cm depth, and the soil organic carbon contents decreased after the conversion of DG to AW. These differences were significant between DG and AL and between AL and AG. The soil inorganic carbon contents at 0 - 100 cm depth decreased significantly from DG to AW and AL, while the decline was not significant from AL to AAL and AG. Profile distribution and the $13C values of soil carbonate contents differed among different types of land use to some extent.

关 键 词：土地利用 覆被 土壤有机碳 无机碳 碳稳定同位素 黄土高原 

分 类 号：S153.6[农业科学—土壤学]