Method for preventing and treating agricultural non-point source pollution for rice field ridge culture in Three Gorges Reservoir Region small watershed

Abstract

The invention discloses a method for preventing and treating agricultural non-point source pollution for rice field ridge culture in the Three Gorges Reservoir Region small watershed. Paddy fields in the outlet of the Three Gorges Reservoir Region small watershed are selected, and ridging is carried out in the paddy fields to structure a ridge culture rice field ecological system. When the ridging is carried out, ridges are made to be parallel to one another and perpendicular to the water flow direction, S-shaped overflowing channels are formed in the ridge ends and among the ridges in each paddy field, water flow is made to be only able to pass through the S-shaped overflowing channels, so that the passing paths and the standing time of the water flow can be prolonged, and crop cultivation of the paddy fields is carried out on the ridges. According to the method, the existing utilization mode of fields and the planting pattern are changed, field occupation is not increased additionally, preventing and treating effects are good, the problem of food productivity is solved, and the method is specially suitable for preventing and treating the agricultural non-point source pollution for the rice field ridge culture in the Three Gorges Reservoir Region small watershed.

Description

technical field [0001] The invention relates to the improvement of the technology for preventing and controlling agricultural non-point source pollution, in particular to a set of technical methods suitable for preventing and controlling agricultural non-point source pollution by paddy field ridge cultivation in the small watershed of the Three Gorges reservoir area, and belongs to the technical field of agricultural environmental pollution control. [0002] Background technique [0003] Agricultural non-point source pollution, also known as agricultural non-point source pollution, has the characteristics of randomness, potential, intermittent, hysteresis, large volume and wide area. In recent years, point source pollution has been gradually controlled and treated. Agricultural non-point source pollution, as the main pollution source of water eutrophication, has attracted widespread attention. The research on non-point source pollution has also become an active field of envi...

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Problems solved by technology

Compared with other treatment technologies, the sewage land treatment system has the advantages of saving investment, saving energy, and low operating costs. The main problems are low hydraulic load, low treatment capacity, and large floor space.

[0005] The above methods generally have the disadvantages of large system footprint and short residence time of non-point source pollutants in the system.

In view of the actual situation of the Three Gorges Reservoir area with many people and little land, the above methods cannot effectively use the existing land, and it is difficult to exert the grain production capacity of the land

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