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| 流域尺度的岩溶区土壤pH值空间变异研究——以云南小江流域为例 | |
| 引用本文： | 蒋勇军.流域尺度的岩溶区土壤pH值空间变异研究——以云南小江流域为例[J].中国岩溶,2009,28(1):80-86. |
| 作者姓名： | 蒋勇军 |
| 作者单位： | 西南大学地理科学学院,重庆,400715;Department of Geography and Geology,Western Kentucky University,USA,Bowling Green,42101 |
| 基金项目： | 国家重点基础研究发展规划(973计划)，中美合作项目，国家自然科学基金，岩溶动力系统开放实验室与桂科能项目 |
| 摘 要： | 以云南小江流域为例,利用地统计学与GIS相结合研究流域尺度上岩溶区土壤pH的空间变异。结果表明,流域土壤pH平均值为6.74,变异系数为9.9%;半方差函数分析表明,流域土壤pH的空间变异符合指数模型,其变程为12km,反映了流域尺度上岩溶区土壤的连续性较差,纯块金方差与基台值的比值为50%,土壤pH具有中等的空间相关性,由空间自相关部分引起的空间变异性的程度较大;全局趋势分析和Kriging插值分析结果表明,流域土壤pH整体明显地呈条带状分布,但在流域中西部地区为斑块状分布,空间变异明显,土壤pH值在东西、南北方向上呈明显的倒U形;地质背景的异质性和地形起伏以及复杂的土地利用方式是土壤pH空间变异较大的主要因素。 |
| 关 键 词： | 流域尺度 岩溶区 土壤pH 空间变异 地统计学 GIS 云南小江流域 |
Spatial variability of karst soil pH on drainage basin scale——A case in Xiaojiang basin, Yunnan` |
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| JIANG Yong-jun.Spatial variability of karst soil pH on drainage basin scale——A case in Xiaojiang basin, Yunnan`[J].Carsologica Sinica,2009,28(1):80-86. | |
| Authors: | JIANG Yong-jun |
| Institution: | JIANG Yong-jun (1. School of Geographical Sciences, Southwest University, Chongqing 400715, China; 2. Department of Geography and Geology, Western Kenlucky University, USA, Bowling Green, 42101 ) |
| Abstract: | The Xiaojiang basin in Yunnan province, Southwest China, covers an area about 1 034 km^2 and locates in 24°12′ -24°45′N and 103°32′- 104°00′E. The basin is mainly underlain by the Triassic System with carbonate rocks of 617 km^2 about 60% of the total area. In this study, the spatial variation of soil pH in Xiaojiang basin is determined by means of geostatistics and GIS to provide theory foundation for quantitative studying soil properties on drainage basin scale in karst area. Based on different stratum, landform, and land-use type, 177 soil samples （ 0-20 cm ） were collected from the watershed. The soil pH was analyzed using the electric potential method. The geostatistical charac- teristics, spatial trend and azimuth of anisotropic axle of soil pH were analyzed using the Geostatistical Analyst, ArcGIS 9.2. And a contour map of soil pH for the watershed using Kriging interpolation was obtained. The results are as follows： （1） Combination of geostatistics and GIS is the very power tool for quantitative studying soil properties in watershed scale. The global trend and semi-variogram parameters obtained from the explore data and the semi-variogram analysis can show the spatial variation of soil pH in Xiaojiang watershed. （2） The distribution of soil was highly variable in Xiaojiang watershed. Statistical analysis showed differences in soil among different stratum, landform and land-use type. The coefficient of variation （CV） of soil pH was greatest in sandstone （CV=10. 9%） and smallest in Quaternary soil （CV=8. 2%） among stra- tum; and greatest in valley soil （13.3%） and smallest in karst basin （7.1~） among landform, and greatest in cultivated land （CV= 9.7 %） and smallest in forest land soil （CV= 8. 6 %） among land-use types. For all soil samples （n= 177）, the mean, minimum, maximum, standard deviation and coefficient of variation of soil pH were 6.74, 5.18, 7.97, 0. 67 and 9.9%, respectively. （3） The spatial correlation distance （ranges） wa |
| Keywords: | GIS |
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