Regional-scale variation and distribution patterns of soil saturated hydraulic conductivities in surface and subsurface layers in the loessial soils of China
文献类型：SCI/SSCI论文
| 作者 | Wang Y. Q. ; Shao M. A. ; Liu Z. P. ; Horton R. |
| 发表日期 | 2013 |
| 关键词 | Land use Soil texture Principal component analysis Minimum data set Geostatistics Soil hydraulic conductivity spatial variability organic-carbon physical-properties field-scale infiltration management moisture plateau quality runoff |
| 英文摘要 | Saturated hydraulic conductivity (K-s) is an important soil property that shows a high degree of spatial heterogeneity. There is a lack of research that investigates and determines Ks at a regional scale, due to the challenges associated with the required intensive sampling. To determine the closely correlated factors affecting K-s at a regional scale and to then generate a regional distribution map of K-s, we selected 382 sampling sites across the Loess Plateau of China (620,000 km(2)) and collected undisturbed and disturbed soil samples from two soil layers (0-5 and 20-25 cm). We found that both surface K-s and subsurface K-s had log(base 10)-normal distributions, and demonstrated strong spatial variability (CV = 206% and 135%, respectively). Surface LogK(s) was most closely correlated with LogSand, LogSilt, LogSG (slope gradient), LogSSWC (saturated soil water content), vegetation coverage and land use; while subsurface Logic was correlated with LogClay, SSWC, LogSG, LogAltitude, LogGY (growth year) and land use. Geostatistical analysis indicated that semivariograms of surface and subsurface Log K-s could be best fitted by an isotropic exponential model, with effective ranges of 204 km and 428 km, respectively. Distribution maps of K-s produced by kriging indicated a pronounced spatial pattern and demonstrated an obvious spatial depth gradient. The spatial distribution patterns of K-s at a regional scale in the loessial soils of China comprehensively reflected soil hydraulic properties and the combined effects of soil texture, vegetation, topography and human activities. (C) 2013 Elsevier B.V. All rights reserved. |
| 出处 | Journal of Hydrology |
| 卷 | 487 |
| 页 | 13-23 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0022-1694 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/30175]  |
| 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.,Liu Z. P.,et al. Regional-scale variation and distribution patterns of soil saturated hydraulic conductivities in surface and subsurface layers in the loessial soils of China. 2013. |
入库方式： OAI收割
来源：地理科学与资源研究所
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