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Change of Soil Organic Carbon after Cropland Afforestation in ′Beijing-Tianjin Sandstorm Source Control′ Program Area in China

查看全文 作　　者：ZENG [1,2]Xinhua;ZHANG [1]Wanjun;LIU [1]Xiuping;CAO [1]Jiansheng;SHEN [1]Huitao;ZHAO [1,2]Xin;ZHANG Nan-[1,2]nan;BAI [3]Yuru;Yi [3]Mei 高影响力作者 机构地区：[1]Key Laboratory of Agricultural Water Resources, Hebei Key Laboratory of Agricultural Water-Saving, Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology,Chinese Academy of Sciences;[2]University of Chinese Academy of Sciences;[3]Forestry Research Institute of Chifeng City高影响力机构 出　　处：《Chinese Geographical Science》索引2014年第24卷第4期,共10页高影响力期刊 基　　金：Under the auspices of Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA05060600);Knowledge Innovation Programs of Chinese Academy of Sciences(No.KSCX2-EW-J-5);National Key Technology Research and Development Program of China(No.2011BAD31B02) 摘　　要：Land use change is one of the major factors that affect soil organic carbon(SOC) variation and global carbon balance. However, the effects of land use change on SOC are always variable. In this study, using a series of paired-field experiments, we estimated the effects of revegetation types and environmental conditions on SOC stock and vertical distribution after replacement of cropland with poplar(Populus tomentosa) and korshinsk peashrub(Caragana korshinskii) in three climate regions(Chifeng City, Fengning City and Datong City of the ′Beijing-Tianjin Sandstorm Source Control′(BTSSC) program area. The results show that SOC sequestration rate ranges from 0.15 Mg/(ha·yr) to 3.76 Mg/(ha·yr) in the soil layer of 0–100 cm in early stage after cropland afforestation in the BTSSC program area. The SOC accumulation rates are the highest in Fengning for both the two vegetation types. Compared to C. korshinskii, P. tomentosa has greater effects on SOC accumulation in the three climate regions, but significantly greater effect only appears in Datong. The SOC density increases by 20%–111% and 15%–59% for P. tomentosa and 9%–63% and 0–73% for C. korshinskii in the 0–20 cm and 20–100 cm soil layers, respectively. Our results indicate that cropland afforestation not only affects SOC stock in the topsoil, but also has some effects on subsoil carbon. However, the effect of cropland afforestation on SOC accumulation varied with climate regions and revegetation types. Considering the large area of revegetation and relatively high SOC accumulation rate, SOC sequestration in the BTSSC program should contribute significantly to decrease the CO2 concentration in the atmosphere. 关 键 词：土壤有机碳密度 京津风沙源治理 植树造林 项目区 农田 土地利用变化 植被类型 中国
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