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| 城市土壤特征土层的数值分类 | |
| 作者姓名： | YUAN Da-Gang ZHANG Gan-Lin GONG Zi-Tong |
| 作者单位： | [1]State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences,Nanjing 210008 （China） [2]Graduate School of the Chinese Academy of Sciences, Beijing 100049 （China） [3]College of Resource and Environmental Sciences, Sichuan Agricultural University, Ya＇an 625014 （China） |
| 基金项目： | 国家自然科学基金，中国科学院基金 |
| 摘 要： | Pedogenetic soil horizons are one of the fundamental building blocks of modern soil classification; however, in soils of urban areas which are often strongly disturbed by human activities, horizons are difficult to distinguish but substitutive morphological layers may be identified. To identify the characteristic soil layers in an urban environment, 224 soil layers of 36 in-situ pedons were examined and described in urban and suburban Nanjing, and 27 variables were extracted for multivariate analysis. Three groups and six subdivisions were identified by TwoStep cluster analysis combined with hierarchical cluster analysis based on factor scores. Soil forming factors and soil forming processes could be interpreted from the principal component analysis （PCA） of variables, cluster analysis of soil layers, and discriminant analysis of soil layer groups and their subdivisions. Parent materials, moisture regimes, organic matter accumulation, and especially nutrient accumulation were the main causes of characteristic soil layer formations. The numerical approaches used in this study were useful tools for characteristic soil layer identification of urban soils. |
| 关 键 词： | 土壤层 多元分析 城市 实验研究 |
| 收稿时间： | 23 May 2007 |
Numerical Approaches to Identification of Characteristic Soil layers in an urban environment |
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| YUAN Da-Gang,ZHANG Gan-Lin,GONG Zi-Tong.Numerical Approaches to Identification of Characteristic Soil layers in an urban environment[J].Pedosphere,2008,18(3):335-343. | |
| Authors: | YUAN Da-Gang ZHANG Gan-Lin and GONG Zi-Tong |
| Institution: | aState Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China) bGraduate School of the Chinese Academy of Sciences, Beijing 100049 (China) cCollege of Resource and Environmental Sciences, Sichuan Agricultural University, Ya'an 625014 (China) |
| Abstract: | Pedogenetic soil horizons are one of the fundamental building blocks of modern soil classification; however,in soils of urban areas which are often strongly disturbed by human activities,horizons are difficult to distinguish but substitutive morphological layers may be identified.To identify the characteristic soil layers in an urban environment,224 soil layers of 36 in-situ pedons were examined and described in urban and suburban Nanjing,and 27 variables were extracted for multivariate analysis.Three groups and six subdivisions were identified by TwoStep cluster analysis combined with hierarchical cluster analysis based on factor scores.Soil forming factors and soil forming processes could be interpreted from the principal component analysis (PCA) of variables,cluster analysis of soil layers,and discriminant analysis of soil layer groups and their subdivisions.Parent materials,moisture regimes,organic matter accumulation,and especially nutrient accumulation were the main causes of characteristic soil layer formations.The numerical approaches used in this study were useful tools for characteristic soil layer identification of urban soils. |
| Keywords: | characteristic soil layer multivariate analysis numerical soil classification urban soils |
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