华中丘陵红壤物理性质空间变异性的研究

SPATIAL VARIABILITY OF PHYSICAL PROPERTIES OF RED SOIL IN HILLY LAND OF CENTRAL CHINA

本文应用地学统计学方法对丘陵红壤地区50×100m^2面积内30个观察点进行了土壤饱和导水率、粘粒、水稳性团聚体、孔隙性等空间变异性研究。通过半方差函数和自相关函数分析,发现这些性质在一定范围內存在空间相关性?捎肒riging方法对各点进行了估测,并应用Cokriging技术,由一种参数估测另一种参数,取得了较为满意的结果。

Spatial variability of saturated hydraulic conductivity, clay and physical clay particles, water-stable aggregate and porosity of red soil were studied using a geostatistical method. Field experiments were undertaken on a red soil at Yingtan, Jiangxi Province, China. There were thirty sampling locations in the experimental field with an area of 50×100 m. The autocorrelation distances of various physical parameters determined in field were different according to the analysis of semivariogram and autocorrelogram: saturated bydraulic conductivity of soil 42.0 m, clay 43.5 m, physical clay 56.0 m, macroaggregate 47.0 m, total porosity 65.0 m, porosity in diameter of>0.03 mm 37.5 m and clay in layer B (20—30 cm) 45.0 m. The estimation of seven soil parameters by using Kriging interpolation method shows that Kriging method was obviousty better than Jackkniffing technology. Its estimated error was just 67.5—90.5% of 3ackniffings'. The saturated hydraulic conductivity of soil was estimated bv porosity in diameter of>0.01 mm and the clay content in B layer was estiamted by clay content in A layer in terms of Cokringing technology. Its estimated error was only 54.1—65.5% of that of linear regression method and 36.2—86% of Kriging's respectively.