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60m下,土壤全氮具有较强的空间相关性,其相关距离为208m。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。
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.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2005年第8期181-183,共3页
Transactions of the Chinese Society of Agricultural Engineering
基金
中国科学院知识创新工程重要方向项目(KZCX3-SW-426)
国家自然科学基金重点项目(40235057)
国家重点基础研究发展规划(973)项目(2002CB412503)
