Composite method for controlling rill erosion of slope farmlands

Abstract

The invention discloses a composite method for controlling the rill erosion of slope farmlands, which realizes soil and water conservation of the slope farmlands by utilizing comprehensive engineering measures and plant measures, and relates to the fields of the improved utilization of sloping fields and the prevention and control of soil erosion. By means of the theory that rills are eroded by sloping surfaces to form critical slope length, terrace banks are constructed by separation distance which is less than or equal to Lc among the sloping surfaces along a contour line according to the critical slope length formed by the rill erosion by the sloping fields, namely the rills are eroded under the condition that the specific slope farmlands are less than the current gradient to generate the separation distance with critical slope length values, the terrace banks are designed and constructed along the contour line, and vegetation zones are planted on the constructed terrace banks to form a layout mode that small units of the sloping surfaces, the terrace banks of the sloping surfaces and the vegetation zones coexist; and the critical slope length Lc formed by the rill erosion by the sloping fields can be obtained by measuring on site in a mode of natural rainfall or artificial rainfall, and also can be obtained by theoretical calculation.

Description

technical field [0001] The invention belongs to the field of slope farmland improvement and utilization and water and soil conservation, and specifically relates to a composite method for controlling slope farmland rill erosion by integrating engineering measures and plant measures in slope farmland transformation to prevent and control slope farmland water and soil loss. Background technique [0002] my country is a country dominated by mountains, which account for about 2 / 3 of the country's land area, and slope land has become the main land resource in our country. According to statistics, in the mountainous areas above 500m above sea level in the country, the area of ​​cultivated land accounts for 44% of the total area of ​​cultivated land in the country, the area of ​​forest land accounts for 90% of the total area of ​​forest land in the country, and the area of ​​grassland accounts for 54% of the total area of ​​grassland in the country. 61% of the total area of ​​agricu...

AI Technical Summary

Problems solved by technology

However, it is unrealistic to carry out large-scale construction of soil and water conservation forests on sloping farmlands dominated by agricultural production, and plant measures on sloping farmlands have limited soil and water conservation benefits

In addition, plants have a process of adapting to the environment and functioning, and the performance of their water and soil conservation benefits has a lag

Against the above background, the production conditions of large-scale mountain slope farmland have not been fundamentally improved

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