农业环境科学学报Issue(6)：1167-1173,7.DOI:10.11654/jaes.2014.06.017
黄土丘陵区不同退耕方式土壤有机碳密度的差异及其空间变化
Spatial Variations in Soil Organic Carbon Density Under Different Restoration Practices in Loess Hilly-gully Region
摘要
Abstract
Studying spatial variation of soil organic carbon density(SOCD)is helpful for exploring the mechanisms of carbon sequestration under different restoration practices in the Loess Plateau. Wufendigou, Zhuanyaogou, and Yangou watersheds were selected across the hilly-gully region of Loess Plateau from North to South. Changes in SOCD in these three watersheds were analyzed during conversion of cropland into grassland and woodland. In the same watershed, SOCD was higher in woodland and grassland than in sloping farmland, and greater in surface(0~10 cm)than in subsurface(10~20 cm)(P<0.05). Under the same land use, SOCD showed significant spatial distribution(P<0.05)among three watersheds. From North to South, SOCD changed from 0.54 kg·m-2 to 0.56 kg·m-2, and to 0.61 kg·m-2 for sloping farm-land, from 0.64 kg·m-2, to 0.90 kg·m-2 and to 1.05 kg·m-2 for woodland, and from 0.71 kg·m-2, to 0.67 kg·m-2 and to 0.73 kg·m-2 for grassland. Compared to the sloping farmland, percent increase in SOCD caused by converting cropland into woodland or grassland had spa-tial variations from North to South. In woodland, the percentage was 18.8%in Wufendigou watershed to 72.7%in Yangou watershed, where-as in grassland it ranged from 32.1%(North)to 20.1%(South). Our results indicate that SOCD is closely related with climate condi-tions , biological factor(the fine- root biomass), soil properties and soil erosion intensity in hilly-gully region of the Loess Plateau.关键词
土壤有机碳密度/小流域/空间变异/退耕还林(草)/黄土丘陵区Key words
soil organic carbon density/small watershed/spatial variation/conversion of cropland into grassland or woodland/loess hilly-gully region分类
农业科技引用本文复制引用
李俊超,郭胜利,党廷辉,张彦军,李娜娜..黄土丘陵区不同退耕方式土壤有机碳密度的差异及其空间变化[J].农业环境科学学报,2014,(6):1167-1173,7.基金项目
国家自然科学基金（41071338）；中国科学院西部行动计划项目 （）
