Spatial variability of soil hydraulic properties on a steep slope in the Loess Plateau of China
文献类型：SCI/SSCI论文
| 作者 | Fan J. |
| 发表日期 | 2008 |
| 关键词 | disc infiltrometer steep sloping land pressure head spatial structure disc infiltrometers infiltration rates conductivity field scale |
| 英文摘要 | The understanding of the structure of the spatial variability of soil surface hydraulic properties on steep slopes is important for modeling infiltration and runoff processes. The objective of this study was to investigate the spatial variability of these properties on a steep slope of the Loess Plateau in northwest China. A 9600 m(2) area was systematically sampled in a grid of 106 points spaced 10 m x 10 m. Hydraulic properties were determined with a disc infiltrometer under multiple pressure heads (-15, -9, -6, -3, 0 cm) at each sample point. Classical and geo-statistical methods were used for data analysis. The results indicated that the variation of Gardner's alpha and hydraulic conductivities at all applied pressure heads was moderate and the heterogeneity for hydraulic conductivities increased as the applied pressure head increased. Along the slope, hydraulic conductivities generally decreased downwards, while the Gardner's alpha fluctuated slightly. The Gardner's alpha of the shaded aspect of the slope was greater than that of the sunny aspect. The hydraulic conductivities of the shaded aspect were greater at higher pressure heads as compared to the sunny aspect, but lower than those of the sunny aspect at lower pressure heads. Correlation analysis showed a negative correlation between hydraulic conductivity and soil organic matter and clay (<0.01 mm) contents. Hydraulic conductivities at pressure heads of -3, -6, -9, -15 cm varied across the slope and their spatial dependence increased as the pressure head declined. The heterogeneity and spatial dependence of hydraulic properties were larger for the areas with shaded aspect as compared to the sunny aspect, however, as pressure decreased they showed a progressively increasing spatial structure, and their spatial structure behaved increasingly similar in both the shaded and sunny aspects. |
| 出处 | Scientia Agricola |
| 卷 | 65 |
| 期 | 3 |
| 页 | 268-276 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0103-9016 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23850]  |
| 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 | Fan J.. Spatial variability of soil hydraulic properties on a steep slope in the Loess Plateau of China. 2008. |
入库方式： OAI收割
来源：地理科学与资源研究所
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