Characteristics of the soil priority flow in the root zone of typical sand-fixing plants in the desert-oasis transition zone
In this study,three typical sand-fixing plants in the desert-oasis transition zone were used as the re-search objects.To simulate water infiltration of 10 L,15 L,and 20 L,respectively(simulating light rain,moder-ate rain,and heavy rain),the field staining tracer method and computer image processing technology were used.The distribution rules and characteristic parameters of the priority flow in the vertical and horizontal sections of the dyed images were analyzed,and the characteristic parameters were selected as evaluation indexes.The mean square decision method was used to determine the degree of development of the soil priority flow in the root zone of typical sand-fixation plants,which provided a reference for the restoration of sand-fixation vegetation and ef-fective utilization of water resources in the desert-oasis transition zone.The results showed that(1)Soil preferen-tial flow occurred in the root zone of sand-fixing plants in the desert-oasis transition zone,and the main types were funnel flow and finger flow.When infiltration water water was increased,the preferential flow occurred lat-erally.(2)Under the various conditions of water infiltration,the soil staining area ratio in the root zone of the three sand-fixing plants showed a nonlinear decrease with an increase in soil depth.The curve of the soil staining area ratio in the root zone of Haloxylon sacralis and Jujube sacralis showed an"S"shape,and the water infiltra-tion was non-uniform.(3)The priority flow evaluation index PFI was from large to small:Haloxell(0.685),Sphae-rophora sphaerophora(0.543),and Hippophora hippophobia(0.502).The degree of priority flow development of the soil in the root zone was the highest.
desert-oasis transition zonesoil priority flowsand-fixing plantsstaining tracer test
万方数据
维普
