Spatial scaling of saturated hydraulic conductivity of soils in a small watershed on the Loess Plateau, China
文献类型：SCI/SSCI论文
| 作者 | Gao L. ; Shao M. G. ; Wang Y. Q. |
| 发表日期 | 2012 |
| 关键词 | Correlation length Nugget-sill ratio Re-sampling analysis Scaling Variance tropical rain-forest variability moisture scales slope land interpolation erosion fields |
| 英文摘要 | Soil saturated hydraulic conductivity ( (S)) is a key variable in hydrologic processes, the parameters of which have strong scale-dependency. Knowing the scaling dependency of (S) is important when designing an appropriate sampling strategy. Determinations of (S) were made for 4,865 undisturbed soil samples, collected from a grid with cells of 10 x 10 m in the Daye watershed (50 ha) on the Loess Plateau, China. The dataset was "re-sampled" to investigate the effect on (S) of scales that differed by two orders of magnitude in terms of spacing and support, and eight scales of extent. The variance, correlation length, and nugget-sill ratio derived by analysis of the full dataset were taken to be the true values. Apparent values of variance, correlation length, and nugget-sill ratio were those calculated for each re-sampled data sub-set. Comparing the parameter values at different scales showed that apparent variance increased with increasing extent ( < 0.01), decreased with increasing support ( < 0.01), but was not significantly affected by spacing ( = 0.137). Apparent correlation length increased with increasing extent and support ( < 0.01). As spacing increased below 1.1 times the true correlation length (i.e., below 80 m), the apparent correlation length decreased slightly but, as spacing increased above 80 m, it notably increased. Apparent nugget-sill ratio decreased with increasing spacing and support ( < 0.01), and increased with increasing extent ( < 0.01). The scaling dependency for (S) was in the order of extent > support > spacing for all three parameters, with mean coefficient of determination values of 0.96, 0.88, and 0.53, respectively. The statistical properties investigated for (S) were found to be scaling-dependent, which would benefit sampling strategy design. |
| 出处 | Journal of Soils and Sediments |
| 卷 | 12 |
| 期 | 6 |
| 页 | 863-875 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1439-0108 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/26933]  |
| 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 | Gao L.,Shao M. G.,Wang Y. Q.. Spatial scaling of saturated hydraulic conductivity of soils in a small watershed on the Loess Plateau, China. 2012. |
入库方式： OAI收割
来源：地理科学与资源研究所
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