Method for improving water quality of reservoir by utilizing space-time specificities of hydro-fluctuation belt

Abstract

The invention provides a method for improving water quality of a reservoir by utilizing space-time specificities of a hydro-fluctuation belt. The method comprises the steps of (1) soil preparation of a counter-slope terrace of the hydro-fluctuation belt, (2) plant cultivation, and (3) plant harvest and utilization, and manual harvest for mulberry, crab grass, hemarthria compressa, sticktight and bermuda grass in experimental areas, wherein the mulberry, the crab grass, the hemarthria compressa, the sticktight and the bermuda grass serve as green feed and are used for feeding livestock, and all plants can be respectively harvested in different growth periods and used for fermentation of a methane-generating pit. According to the method for improving the water quality of the reservoir by utilizing the space-time specificities of the hydro-fluctuation belt, potential productivity of land of the gentle slope hydro-fluctuation belt is utilized, economic plants suitable for environment of the hydro-fluctuation belt are selected and planted, the plants can effectively absorb nitrogen, phosphorus and other pollutants in soil during growing, and pollution loads of the soil are reduced through harvest and utilization of the plants. Meanwhile, secondary cumulative pollution for water body due to death of the plants or rot of stem leaves is avoided, when the hydro-fluctuation belt is submerged, biogenic element conversion is generated on a water and soil interface, pollution for the water body due to release of the nitrogen, the phosphorus and the other pollutants in the soil is relieved, or the nitrogen, the phosphorus and the other pollutants in the water body are absorbed, and the aim of improving water quality is achieved.

Description

technical field [0001] The invention relates to the technical field of water pollution prevention and control, in particular to a method for improving the water quality of a reservoir by utilizing the spatiotemporal specificity of a water-fluctuation zone. Background technique [0002] my country has built more than 86,000 reservoirs of various types, with a total storage capacity of nearly 500 billion m 3 , while exerting huge comprehensive benefits such as flood control, irrigation, power generation, shipping and water supply, a large area of ​​water-fluctuation zone has been formed around the reservoir. The area of ​​the water-fluctuation zone is closely related to the topography of the reservoir forming area and the water level drop of the reservoir. Usually, the area of ​​the water-fluctuation zone of the canyon or hilly reservoir is small, and the area of ​​the water-fluctuation zone of the plain reservoir is large; the water level drop of the reservoir is large , the...

AI Technical Summary

Problems solved by technology

The water-fluctuating zone of the Three Gorges Reservoir is an alternating environment of water and land. During the outcropping period, artificially constructed or naturally formed vegetation plays an important role in retaining, absorbing and transforming non-point source pollution. ) Plants die or stems and leaves rot, and pollutants are re-released into the water body, causing cumulative secondary pollution to the water quality of the reservoir and affecting the water environment safety of the reservoir

[0006] The above-mentioned vegetation construction technology in the water-fluctuation zone emphasizes the ability of plants to withstand flooding, and can resume growth after the water-fluctuation zone is exposed. It has the function of fixing soil and revetment, but it does not involve the screening, harvesting and utilization of decontamination plants, including the absorption of soil nitrogen by the plants themselves. , phosphorus capacity and aboveground biomass size, and plant leaves or partial stems will cause cumulative secondary pollution to the water body after rot; the above water pollution load reduction technology directly takes biological measures (microorganisms, aquatic plants and Animals), did not use the space-time characteristics of the exposure and submersion of the wading zone, which is different from the space area and environmental characteristics involved in the patented technology of this application

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