摘要
在黄土高原丘陵区,了解土壤水分的空间分布对植被恢复空间布局具有重要意义。以黄土丘陵区纸坊沟小流域为研究区,以DEM为基础,通过采集土壤水分样本,利用薄板光滑样条函数插值方法,对各地形因子对土壤水分空间变异性的影响与趋势进行研究。结果表明:(1)利用薄板光滑样条函数法所生成的具有规则栅格的土壤水分空间数据,使离散而不规则的土壤性质数据功能得到了扩展,而且能更清楚地表现地形因子对土壤水分的影响;(2)与克立格法相比,样条函数法比克立格法插值精度可提高2倍,更能准确和清晰地表现土壤水分随地形的变化特征。
The Loess Plateau,in western China,is a water limited agricultural region, and water is the most important factor limiting agricultural production as well as re-vegetation in this region. Therefore, understanding the spatial distribution of soil water is of great importance to choice of right species for the right sites at watershed or regional scale. This paper aims at exploring the effect of topographic factors on the spatial distribution of soil water in a small catchment on Loess Plateau using the thin plate smoothing spline method,which can be operated in ANUSPLIN. Topographic factors such as elevation,aspect and slope were derived from DEM with a resolution of 25 m. The results showed that （1） the spatial soil water map produced using thin plate smoothing spline method can provide accurate interpolation of soil water samples and a clearer picture on the effect of topographic factors on soil water than that by Kriging interpolation; （2） statistical analysis showed that the thin plate smoothing spline method improved the accuracy of interpolation about 2 times than Kriging method.
出处
《水土保持研究》
CSCD
北大核心
2008年第2期80-83,87,共5页
Research of Soil and Water Conservation
基金
国家自然科学基金项目"干旱黄土丘陵区植被自然恢复与人工调控研究"(40301029)
郑州大学引进人才基金项目
关键词
地形因子
土壤水分
空间变异性
样条函数法
topographic factors
soil moisture
spatial variability
thin plate smoothing spline
