重庆沙溪庙组紫色土土壤基质和优先流入渗的定量测算

doi:10.16843/j.sswc.2019.06.006

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Abstract [Background] Preferential flow is prevalent in field conditions, and quantitative differentiation of matrix and preferential flow can provide basic data for soil infiltration process and hydrologic cycle of Shaximiao purple soil.[Methods] We used a surface ring infiltration meters and selected Shaximiao purple soil area in Chongqing as the research object to measure soil matrix infiltration rate (i_m), total infiltration rate (i_t), and to calculate the preferential infiltration rate (i_p). The success of matrix infiltration measurement was determined by excavating wetted soil via matrix infiltration. The feasibility of replacing the preferential flow process with the matrix infiltration process of adjacent soil was verified by calculating the spatial variability of matrix infiltration. On this basis, the quantitative relationship between matrix infiltration and preferential flow was analyzed, and the experimental results were compared with previous studies to verify the rationality of the method.[Results] 1) For i_m, the initial one is in 480.0-900.0 mm/h, the steady one is in 341.4-403.2 mm/h, the average one is 416.3-513.7 mm/h, and the cumulative infiltration is 657.2-805.9 mm. For i_t, the initial one is 984.0-2 470.8 mm/h, the steady one is 359.4-720.0 mm/h, the average one is 648.2-1 239.3 mm/h, and the cumulative infiltration is 966.2-1 898.1 mm. For i_p, the initial one is 504.0-1 570.8 mm/h, the steady one is 18.0-316.8 mm/h, the average one is 231.3-725.8 mm/h, and the cumulative infiltration is 309.0-1 092.7 mm. 2) Among the infiltration model fitting parameters (S, K, a, b), i_m and cumulative infiltration (CI) characterizing soil matrix infiltration process, the coefficient of variation (CV) for S is maximum 15.6%. The spatial variation coefficient of steady infiltration and cumulative infiltration rate is 8.9% and 10.4%, respectively, indicating that the spatial variation coefficient of i_m is small. 3) In the initial stage (0-10 min), i_p/i_m is 1.1-1.7, the preferential flow infiltration is dominant. As the infiltration continues (10-60 min), i_p/i_m decreases, i_p/i_m is 0.5-1.6. In the steady infiltration stage (60-90 min), i_p/i_m is 0.2-1.0, and the matrix infiltration is dominant. 4) Using the Philip and Kostiakov infiltration models to fit the matrix infiltration process of the experimental sites, R² is 0.88 and 0.93, respectively, P<0.01, these two models fit well for the i_m.[Conclusions] Soil matrix and preferential flow play an equally important role in the hydrological cycle of purple soil. The surface ring infiltration meters can be well used for measuring the infiltration performance of Shaximiao purple soil in Chongqing.

Key words： surface ring infiltration meters purple soils in Shaximiao matrix infiltration preferential flow

Received: 01 July 2019

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S157.1

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	TAO Tingting
	CHEN Xiaoyan
	HUANG Yongchao
	LI Yanhai
	GU Xiaojie

Cite this article:

TAO Tingting,CHEN Xiaoyan,HUANG Yongchao, et al. Quantitative measurement and calculation of soil matrix and preferential infiltration in Shaximiao purple soil, Chongqing[J]. SSWC, 2019, 17(6): 41-51.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2019.06.006 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2019/V17/I6/41

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