Spatial Variability of Soil Parameters of the van Genuchten Model at a Regional Scale
文献类型：SCI/SSCI论文
| 作者 | Wang Y. Q.; Shao, M. A.; Han, X. W.; Liu, Z. P. |
| 发表日期 | 2015 |
| 关键词 | Fractal dimension Geostatistics Loess Plateau Residual maximum likelihood Soil water retention curve saturated hydraulic conductivity water-retention parameters pedo-transfer functions organic-carbon stocks loess plateau physical-properties pedotransfer functions temporal variability tropical soils bulk-density |
| 英文摘要 | 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 0-5cm soil layer at 382 sampling sites across the entire Loess Plateau of China (similar to 620000km(2)). 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 ((s)) 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 ((r)) and a scaling parameter that is related to the inverse of the air entry pressure () were moderately (CV=96%) and strongly variable (CV=136%), respectively. Semivariograms of and log() were best-fitted by an isotropic exponential model, while those of (s) and log(n) were fitted by an isotropic spherical model. Fractal analysis indicated that log() demonstrated the most short-range variation, while log(n) reflected the importance of long-range variation. Bulk density and the contents of clay, silt, sand and soil organic carbon contributed greatly to the variations in the VG parameters (except ). However, the vegetation, topographic and climatic elements as well as land use also usually explained some of the variation. The VG parameters, at the regional scale, demonstrated different characteristics of spatial variation, which comprehensively reflected the combined effects of processes involving the soil, vegetation, topography and climate as well as effects of land use, which is often determined by human activity. |
| 出处 | Clean-Soil Air Water |
| 卷 | 43 |
| 期 | 2 |
| 页 | 271-278 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1863-0650 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/38933]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Wang Y. Q.,Shao, M. A.,Han, X. W.,et al. Spatial Variability of Soil Parameters of the van Genuchten Model at a Regional Scale. 2015. |
入库方式： OAI收割
来源：地理科学与资源研究所
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