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- Title
Spatial Variability of Soil Parameters of the van Genuchten Model at a Regional Scale.
- Authors
Wang, Yunqiang; Shao, Ming'an; Han, Xiangwei; Liu, Zhipeng
- Abstract
Spatial heterogeneity of soil water retention curves (SWRC) plays an important role in modelling the movement of water and solutes in soils. To characterize the spatial variability of SWRC parameters fitted by the van Genuchten (VG) equation, and then identify factors that closely correlated with the VG parameters, we collected undisturbed and disturbed soil samples from the upper 0-5 cm soil layer at 382 sampling sites across the entire Loess Plateau of China (~620 000 km2). We determined the SWRC and six other soil properties as well as nine environmental factors for each site. Results showed that the saturated water content ( θs) and a curve-shape parameter that is related to soil pore size distribution ( n) were weakly spatially variable (coefficient of variation (CV) = 15%), and that the residual soil water content ( θr) and a scaling parameter that is related to the inverse of the air entry pressure ( α) were moderately (CV = 96%) and strongly variable (CV = 136%), respectively. Semivariograms of
- Subjects
LOESS Plateau (China); SOIL moisture; FRACTAL dimensions; SOIL composition; SOIL air
- Publication
CLEAN: Soil, Air, Water, 2015, Vol 43, Issue 2, p271
- ISSN
1863-0650
- Publication type
Article
- DOI
10.1002/clen.201300903