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Effects of land use, climate, topography and soil properties on regional soil organic carbon and total nitrogen in the Upstream Watershed of Miyun Reservoir, North China
Wang, Shufang; Wang, Xiaoke; Ouyang, Zhiyun
2012
Source PublicationEnvironmental Sciences & Ecology
ISSN1001-0742
Volume24Issue:3Pages:387-395
AbstractSoil organic carbon (SOC) and total nitrogen (TN) contents as well as their relationships with site characteristics are of profound importance in assessing current regional, continental and global soil C and N stocks and potentials for C sequestration and N conservation to offset anthropogenic emissions of greenhouse gases. This study investigated contents and distribution of SOC and TN under different land uses, and the quantitative relationships between SOC or TN and site characteristics in the Upstream Watershed of Miyun Reservoir, North China. Overall, both SOC and TN contents in natural secondary forests and grasslands were much higher than in plantations and croplands. Land use alone explained 37.2% and 38.4% of variations in SOC and TN contents, respectively. The optimal models for SOC and TN, achieved by multiple regression analysis combined with principal component analysis (PCA) to remove the multicollinearity among site variables, showed that elevation, slope, soil clay and water contents were the most significant factors controlling SOC and TN contents, jointly explaining 70.3% of SOC and 67.1% of TN contents variability. Only does additional 1.9% and 3% increase in the interpretations of SOC and TN contents variability respectively when land use was added to regressions, probably due to environment factors determine land use. Therefore, environmental variables were more important for SOC and TN variability than land use in the study area, and should be taken into consideration in properly evaluating effects of future land use changes on SOC and TN on a regional scale.
Department城市与区域生态国家重点实验室
KeywordSoil Organic Carbon Soil Total Nitrogen Principal Component Analysis Multiple Regression Analysis
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Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/7970
Collection城市与区域生态国家重点实验室
Recommended Citation
GB/T 7714
Wang, Shufang,Wang, Xiaoke,Ouyang, Zhiyun. Effects of land use, climate, topography and soil properties on regional soil organic carbon and total nitrogen in the Upstream Watershed of Miyun Reservoir, North China[J]. Environmental Sciences & Ecology,2012,24(3):387-395.
APA Wang, Shufang,Wang, Xiaoke,&Ouyang, Zhiyun.(2012).Effects of land use, climate, topography and soil properties on regional soil organic carbon and total nitrogen in the Upstream Watershed of Miyun Reservoir, North China.Environmental Sciences & Ecology,24(3),387-395.
MLA Wang, Shufang,et al."Effects of land use, climate, topography and soil properties on regional soil organic carbon and total nitrogen in the Upstream Watershed of Miyun Reservoir, North China".Environmental Sciences & Ecology 24.3(2012):387-395.
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