Methods to reduce rainfall and snowmelt erosion in valleys with low vegetation cover and mountain slopes in arid areas

Abstract

The invention relates to a method for reducing rainfall and snowmelt erosion of low vegetation covered piedmont slopes of river valleys in arid regions. According to the method, on the slope environment condition that the slope degree ranges from 3 degrees to 10 degrees, ridges are constructed along a contour line under the situation that landform is not changed, water blocking and desilting are conducted, and meanwhile the effects of reducing slope-runoff and slowing down the flow velocity are achieved. Drain outlets made of concrete are constructed at the portions, 50 m away from each other, of each ridge, flow leakage is convenient when the amount of snowmelt water is too large in spring, and man-made disasters caused by washing the ridges are prevented. According to differences of demands of lucerne and lycium chinensis on moisture, lycium chinensis is planted in a water collecting area between two ridges, lucerne is planted in the area where water is not collected, the survival rate of planted plants is increased, and the surface vegetation coverage and water containing capacity of soil are improved. By means of the method, the purposes of reducing slope-runoff, slowing down the flow velocity, depositing silt, increasing soil thickness and preventing soil nutrient loss so as to reduce water and soil loss of the low vegetation covered piedmont slopes of which the slope degree ranges form 3 degrees to 10 degrees can be achieved, and control over rainfall and snowmelt erosion of the low vegetation covered piedmont slopes of the river valleys in the arid regions is achieved.

Description

technical field [0001] The invention relates to a technology for water and soil conservation in valleys in arid areas, in particular to a technology for reducing rainfall and snowmelt erosion in valleys and slopes covered by low vegetation in arid areas. Background technique [0002] The Yili River Valley is located in the west of the Tianshan Mountains in the Xinjiang Uygur Autonomous Region. It is the bridgehead of my country's land passage to West Asia and Europe, and it is also an important grain production base in Xinjiang. As one of the seven major land development and consolidation projects in the country, the soil erosion problem in the Yili River Basin has become increasingly prominent in the process of large-scale continuous land development, and the soil erosion problem in the low-vegetation-covered hillside slopes that are concentrated in land development is one of them. one. A layer of large-pore collapsible loess and Quaternary loose deposits were deposited on...

AI Technical Summary

Problems solved by technology

Soil erosion not only loses the area of ​​effective land use, but also greatly reduces the effectiveness of existing land use, and will reduce the water quality of rivers, affecting the good relationship between my country and downstream countries