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空间插值方法在各个领域已有了广泛的应用,而不同的研究对象则有适应各自的区域特征的空间插值方法。以延河流域为例,对黄土丘陵区(0~10 cm、10~30 cm和30~60 cm等)三个典型土壤剖面的土壤容重进行空间插值方法比较研究。结果表明:(1)在水平方向,延河流域0~30 cm层面的土壤容重从北到南呈现一个递增的趋势,同南北气候湿润程度以及植被覆盖程度密切相关,而对于30~60 cm的土壤容重在南北方向上则保持相对均衡且与河网分布有关;(2)在垂直方向,土壤容重随着土层加深同样呈现递增的趋势;(3)根据误差分析,薄盘样条函数插值更适宜于该区域关于土壤容重的插值。
Spatial interpolation methods have been widely used in various fields, while different research objects have spatial interpolation methods that adapt to their respective regional characteristics. Taking Yanhe River Basin as an example, the spatial interpolation methods of soil bulk density of three typical soil profiles in loess hilly region (0 ~ 10 cm, 10 ~ 30 cm and 30 ~ 60 cm, etc.) were compared. The results showed as follows: (1) In the horizontal direction, the soil bulk density of 0 ~ 30 cm layer in Yanhe River basin showed an increasing trend from north to south, closely related to the humid degree of the north and south climates and the degree of vegetation coverage. For the 30-60 cm (2) In the vertical direction, the soil bulk density tends to increase with the deepening of the soil layer. (3) According to the error analysis, the interpolation of the thin plate spline function More suitable for the region on soil bulk density interpolation.