LIU Tingting, DAI Quanhou, PENG Xudong, et al. Variation of Soil Infiltration Characteristics at Rock-Soil Interface Driven by Returning Farmland in Rocky Desertification Area[J]. 2022, 36(6): 88-94.
DOI:
LIU Tingting, DAI Quanhou, PENG Xudong, et al. Variation of Soil Infiltration Characteristics at Rock-Soil Interface Driven by Returning Farmland in Rocky Desertification Area[J]. 2022, 36(6): 88-94. DOI: 10.13870/j.cnki.stbcxb.2022.06.012.
Variation of Soil Infiltration Characteristics at Rock-Soil Interface Driven by Returning Farmland in Rocky Desertification Area
In order to reveal the effect of returning farmland on the soil infiltration characteristics of the outcrop rock-soil interface in the rocky desertification area
the arable land was taken as the control
and the fallow field
farmland return to shrubs grassland and orchard were selected as the research objects
and the soil infiltration characteristics of rock-soil interface with different shapes of straight
convex and concave were studied through the ring knife method. The results showed that: (1) The soil infiltration process and characteristics at the rock-soil interface of different types of returning farmland varied greatly. From the initial infiltration rate to the stable infiltration rate
the attenuation range was between 0.350 mm/min and 55.756 mm/min
and the soil infiltration rate varied greatly among different rock-soil interface shapes. (2) The main influencing factors of soil infiltration rate at rock-soil interface of different types of returning farmland were capillary porosity and non-capillary porosity. The initial infiltration rate
average infiltration rate and stable infiltration rate all had extremely significant negative correlation with capillary porosity (p<0.01). The initial infiltration rate was significantly positively correlated with non-capillary porosity (p<0.05). (3) Compared with Kostiakov model and Philip model
Horton model had the best applicability for fitting the soil infiltration process at the rock-soil interface of different types of returning farmland
and it could better simulate the soil infiltration process and predict the soil infiltration capacity. (4) According to the principal component analysis
soil infiltration capacity at the rock-soil interface followed the order of arable land (0.99)>fallow field (0.16)>returning farmland to shrubs and grassland (-0.43)>returning farmland to orchard (-0.72). The returning farmland significantly reduced the soil infiltration capacity of the outcrop rock-soil interface in the rocky desertification area
especially at the convex rock-soil interface. The research results were expected to provide a scientific basis for future understanding of the water leakage at the rock-soil interface in rocky desertification areas after returning farmland.
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