亚热带红壤丘陵典型区土壤全氮的空间变异特征
Characteristics of spatial variability of total soil nitrogen in the typical subtropical red soil hilly areas
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摘要: 在GIS支持下，运用地统计学方法分析了耕层土壤全氮的空间变异特征，并在此基础上利用Kriging插值方法绘制了土壤全氮的空间分布图。结果表明，在步长间隔60 m下，土壤全氮具有较强的空间相关性，其相关距离为208 m。在NE30°、NE120°两个方向上具有典型的几何异向性结构特点；在NE60°、NE150°两个方向上具有典型的带状异向性结构特点。Kriging插值结果表明，研究区土壤全氮的空间分布表现为条带状和斑块状分布。土壤全氮高值斑块区的分布与地势相对低洼的地形部位相吻合。地形是影响土壤全氮空间变化的主要因素。
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关键词:
- 土壤全氮 /
- 空间变异性 /
- Kriging插值法 /
- GIS /
- 亚热带典型区
Abstract: A geostatistics method combined with GIS was applied to analyze and map the spatial variability of total soil N in topsoil. The results showed that total soil N had strong spatial relativity at 60 m lag interval and its range of autocorrelation extended to 208 m. The variogram of total soil N was characterized by geometric anisotropy in NE30° and NE120° directions and zonal anisotropy in NE60° and NE150° directions. The spatial distribution map of total soil N interpolated by Kriging interpolation showed apparently strip and block. The "hot spots" of high soil N content were consistent with the low locations of the field. The spatial distribution of total soil N was controlled by topology.-
Keywords:
- total soil nitrogen /
- spatial variability /
- Kriging interpolation /
- GIS /
- typical subtropical areas
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