摘要
通过野外调查和室内分析，采用多元线性逐步回归和地理信息系统（GIS）相结合的方法，研究了黄土丘陵区燕沟流域表层（0-20cm）土壤的有机碳密度、空间分布及其与土地利用类型和地形因子等的关系。结果表明，流域表层土壤有机碳密度平均为1．72kg／m^2，变幅为0．97～2．93kg／m^2；土地利用类型是影响土壤有机碳密度变化的首要因子；流域土壤有机碳密度呈镶嵌的树枝状和条带状空间分布格局，其高值斑块区与乔木林地和灌木林地的分布一致，中值斑块区与草地和川坝地的分布一致，低值斑块区与梯田、果园、坡耕地、疏林地和未成林地的分布一致。流域表层土壤有机碳总储量为76．81×10^3t。
Based on field survey and laboratory analysis, by using multi--linear stepwise regression and geographic information system （GIS）, the paper studied the spatial distribution of surface soil （0--20 cm）, organic C density in the Yangou watershed of loess hilly-gully region and its relationships with land use, landform,and so on. The results showed that the surface soil organic C density ranged from 0.97-2.93 kg/m^2 ,with an average about 1.72 kg/m2 in the watershed;the most important influential factor of soil organic C density was land use lthe spatial distribution map of soil organic C density showed apparent arbori zation and strip. The “hot spots” of high soil organic C density were consistent with the distributions of arbor and bush land,those of low soil organic C density were consistent with the distributions of the terrace, orchard,slope farmland,sparse woodland and new woodland and those of middle soil organic C density were consistent with the distributions of the grassland and plain land. The total soil organic C storage of topsoil in the watershed was about 76.81 - 10^3 t.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2007年第10期98-102,109,共6页
Journal of Northwest A&F University(Natural Science Edition)
基金
中国科学院西部之光项目
中国科学院水土保持研究所领域前沿项目
关键词
黄土丘陵区
土壤有机碳密度
燕沟流域
hilly region of loess plateau
soil organic carbon density
Yangou watershed
