| 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(0～20 cm)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1.72 kg/m2,变幅为0.97～2.93 kg/m2;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76.81×103t。 |
| 关键词: 黄土丘陵区 土壤有机碳密度 燕沟流域 |
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| 基金项目: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 |
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| Organic carbon density of topsoil and its spatial distribution of small watershed in hilly region of loess plateau |
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| Abstract: |
| 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/m2,with an average about 1.72 kg/m2 in the watershed;the most important influential factor of soil organic C density was land use;the spatial distribution map of soil organic C density showed apparent arborization 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 76.81×103 t. |
| Key words: hilly region of loess plateau,soil organic carbon density,Yangou watershed |
