Ecological pollution reduction type drainage ditch construction method for preventing ditch wall soil loss

Abstract

The invention belongs to the technical field of agricultural non-point source pollution, and particularly relates to an ecological pollution reduction type drainage ditch construction method for preventing ditch wall soil loss. The method comprises the following steps that (1), a drainage ditch is constructed, wherein the drainage ditch comprises a ditch body, ditch walls on the two sides of the ditch body and a ditch bottom; and (2), different plants are planted according to different gradients of the ditch walls, wherein when the gradient of the ditch walls is smaller than 30 degrees, vetiver grass is completely planted on the ditch walls, when the gradient of the ditch walls is larger than or equal to 30 degrees and smaller than or equal to 60 degrees, vetiver grass is planted on the lower half portions of the ditch walls, pennisetum purpureum is planted on the upper half portions of the ditch walls, and when the gradient of the ditch walls is larger than 60 degrees, pennisetum purpureum is completely planted on the ditch walls. The drainage ditch in the south subtropical red soil farming area with the thin soil layer, large soil porosity and poor water-retaining property is mainly used, the corresponding plants planted on the different gradients of the ditch walls on the two sides of the ditch and the ditch bottom are used for protecting the ditch walls and intercepting and absorbing pollutants in the ditch water body, and the concentration of the pollutants in the ditch water body is reduced while the ditch walls are prevented from collapsing or sliding so as to purify water.

Description

technical field [0001] The invention belongs to the technical field of agricultural non-point source pollution, and in particular relates to an ecological pollution-reducing drainage ditch construction method for preventing ditch wall soil loss. Background technique [0002] Drainage ditches in red soil farming areas with thin soil layer, high soil porosity and poor water retention in subtropical subtropics are prone to landslides or collapses when washed by heavy rains. Under the action of runoff, pollutants such as collapsed objects, dead leaves on the surface of the farmland, applied fertilizers, and pesticides are brought into the receiving lakes and reservoirs adjacent to the farmland through ditches, resulting in an increase in the amount of sediment in the local water body and eutrophication of the water body. Water quality and ecological environment pose a serious threat. [0003] At present, there are few reports on patents related to ditch wall protection. Many sc...

AI Technical Summary

Problems solved by technology

Although this protective measure is stable, it has caused corresponding damage to the surrounding ecosystem, and it cannot be applied to drainage ditches in southern subtropical red soil farming areas with thin protective soil, large soil porosity, and poor water retention. Damage to ditches and ditch walls in red soil farming areas

In addition, most of the research on the control of agricultural non-point source pollution by ditches focuses on ecological ditches, mainly to prepare ecological concrete, concrete slabs, and lay ecological bricks and cement boards in ditches. Although these methods can remove pollutants to a certain extent However, it has a large amount of engineering, high cost, cumbersome process, and difficult operation and management. It is difficult to popularize and apply it on a large scale, and it cannot be adapted to the natural drainage ditches in red soil farming areas.

[0004] For this reason, for ditches in subtropical crimson soil farming areas with thin soil layers, large soil porosity, and poor water retention, the inventors designed an ecological pollution-reducing drainage ditch construction method to prevent ditch wall soil loss, in order to solve the problem during heavy rain periods. Collapse or landslides faced by farmland ditches, pollutants entering adjacent receiving water bodies and polluting water quality

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