2008
DOI: 10.1590/s0103-90162008000300007
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Abstract: 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 × 10 m. Hydraulic properties were determined with a disc infiltrometer under multiple pressure heads (-15, -9, … Show more

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Cited by 49 publications
(25 citation statements)
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References 24 publications
(13 reference statements)
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“…Standard deviations for parameters K c , a and S increased when moving from the severely unsaturated condition toward the near or fully saturated condition, but l shows a contrary variation pattern with the change in water tension. The highest value of CV among all of the measured K c was obtained for K 0 (Table 2), which is in close agreement with the findings of Hu et al (2008) who stated that the highest CV value was obtained for measured K c at the highest applied pressure (0 m). Hu et al (2008) concluded that the distribution of smaller pore sizes would be more uniform than that of larger ones because the dominant pore size governing water flow in soils decreases with decreasing head of pressure.…”
Section: Resultssupporting
confidence: 90%
See 1 more Smart Citation
“…Standard deviations for parameters K c , a and S increased when moving from the severely unsaturated condition toward the near or fully saturated condition, but l shows a contrary variation pattern with the change in water tension. The highest value of CV among all of the measured K c was obtained for K 0 (Table 2), which is in close agreement with the findings of Hu et al (2008) who stated that the highest CV value was obtained for measured K c at the highest applied pressure (0 m). Hu et al (2008) concluded that the distribution of smaller pore sizes would be more uniform than that of larger ones because the dominant pore size governing water flow in soils decreases with decreasing head of pressure.…”
Section: Resultssupporting
confidence: 90%
“…They also concluded that the CV of a was found to be much smaller than the CV of K c and K s , which indicated that a was a more homoscedastic parameter. Hu et al (2008) found that the correlation between length and the spatial dependency of K c was enhanced as the head of pressure decreased, because as the applied head of pressure drops, the corresponding flow is progressively governed by intrinsic soil properties such as particle size distribution. Sobieraj et al (2004) 632…”
Section: Introductionmentioning
confidence: 99%
“…Those results indicated that alfalfa or native grass significantly reduce the runoff amount. Runoff from bareland was less than the runoff from cropland simply because the bareland's infiltration rate was greater because bare plots were plowed yearly (consistent with Hu et al, 2008) which may reduce the soil bulk density. Runoff from the bareland decreased after plowing, but soil loss from the bareland was distinctly greater because of lack of surface protection by plants, residue and roots from raindrop impacts and obstruction to surface flow.…”
Section: )mentioning
confidence: 71%
“…The mean soil erosion modulus is 150 Mg ha −1 year −1 (Tang et al 1993). The soil at the site is classified as Ust-Sandic Entisols with sandy loam textured (Hu et al 2008). …”
Section: Study Areamentioning
confidence: 99%
“…The low contents of CL (Fig. 6e) at the site are primarily because sandy loam soils are dominant (Hu et al 2008) and stability in the soil erosion process (Young 1980). As a consequence, the spatial distributions of D b and SW correspond to the sediment redistribution processes with larger D b values corresponding to higher SA contents and larger SW values corresponding to higher SI contents.…”
Section: Spatial Pattern Analysismentioning
confidence: 99%