黄土高寒区小流域土壤饱和导水率和土壤密度的分布特征

doi:10.16843/j.sswc.2019.04.002

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Abstract [Background] Soil saturated hydraulic conductivity K_s and bulk density ρ_s under different soil depth,slope positions and slope aspects have important effects on soil water distribution and rainfall infiltration in the catchment. However, few reports on this issue in the alpine zone of the Loess Plateau are available.[Methods] In order to clarify the response of two soil physical parameters (ρ_s and K_s) to soil depth, slope aspects, and slope position of small watershed, 72 sample points were selected in typical small watershed of this region by grid sampling method. The undisturbed soil cores of 0-60 cm soil layers were taken at intervals of 20 cm depth. And the data of K_s and ρ_s were determined by the constant water-head method and oven-drying method, and then were analyzed using classical statistics and variance analysis.[Results] 1) In small watershed, the K_s was 1.018 mm/min in moderate variability, and the ρ_s was 1.257 g/cm³ in weak variability, all of them had a normal distribution, and there was a significantly negative correlation between K_s and ρ_s. Meanwhile, K_s and ρ_s both were significantly correlated with soil porosity and soil particle-size distribution. The correlation between K_s and sand content was the highest, but the correlation coefficient was only 0.276. The correlation coefficient between ρ_s and total porosity and capillary porosity were the largest, both of which were greater than 0.890. 2) The series for K_s according to soil depth was:1.20 mm/min(0-20 cm) > 1.09 mm/min (20-40 cm) > 0.84 mm/min (40-60 cm), with a moderate degree of variation and no significant difference (P>0.05). The ρ_s increased with the deepening of soil layer and was the degree of weak variation and no significant difference (P>0.05). 3) The mean value of K_s was as follows:lower position (1.17 mm/min) > middle position (1.21 mm/min) > upper position (0.75 mm/min), and ρ_s mean value was upper position (1.29 g/cm³) > middle position (1.24 g/cm³) > lower position (1.22 g/cm³) in different slope positions. 4) The order of K_s in different slope aspects were as follows:north-facing slope (1.34 mm/min) > south-facing slope (1.26 mm/min) > east-facing slope (0.53 mm/min), while the overall performance of ρ_s was opposite to K_s. And the value of ρ_s was:north-facing slope (1.21 g/cm³) < south-facing slope (1.25 g/cm³) < east-facing slope (1.28 g/cm³). There were significant differences between different slope aspects (P<0.05).[Conclusions] Soil water conductivity enhanced from top to the bottom of the slope, and was the best in the north-facing slope and the worst in the east-facing slope, but there was no significant difference with the deepening of soil layer in the small watershed.

Key words： soil saturated hydraulic conductivity bulk density variance analysis coefficient of variation

Received: 12 November 2018

PACS:

S152

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	LI Ping
	WANG Dongmei
	DING Cong
	REN Yuan

Cite this article:

LI Ping,WANG Dongmei,DING Cong, et al. Distribution characteristics of soil saturated hydraulic conductivity and soil bulk density in a small watershed in the alpine zone of the Loess Plateau[J]. SSWC, 2019, 17(4): 9-17.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.04.002 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I4/9

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