Spatial Variability Analysis of Soil Physical …（土壤空间变异性分析物理u2026）.pdfVIP

Spatial Variability Analysis of Soil Physical Properties of Alluvial Soils Javed Iqbal,* John A. Thomasson, Johnie N. Jenkins, Phillip R. Owens, and Frank D. Whisler . d ABSTRACT ited on sandy or on loamy sediments. Therefore, it is e v r Analysis and interpretation of spatial variability of soils is a key- important to study not only the extent of surface spatial e s stone in site-specific farming. Soil survey maps may have up to 0.41- variability, but also the distribution of subsurface and e r s ha inclusions of dissimilar soils within a mapping unit. The objectives deep soil horizons. t of this study were to determine the degree of spatial variability of soil Among the various soil physical properties, Ks and h g physical properties and variance structure, and to model the sampling i related measures are reported to have the highest statis- r y interval of alluvial floodplain soils. Soil profiles (n 209) from 18 tical variability (Biggar and Nielsen, 1976). Bouma p o parallel transects were sampled with a mean separation distance of (1973) stressed the need for more studies on field vari- c l 79.4 m. Each profile was classified into surface, subsurface, and deep l ability of Ks and soil water retention curves. Stockton A horizons. Structural analysis of soil bulk density ( ), sand, clay, satu- b a. rated hydraulic conductivity (K ), volumetric water content ( ) at and Warrick (1971) indicated that var