Water-saving and pollution-reducing method for water circulation use in irrigation and drainage coupled ecological irrigation district in flat areas

Abstract

The invention discloses a water-saving and pollution-reducing method for irrigation and drainage coupled water circulation use in a flat ecological irrigation district, wherein an irrigation district drainage period and an irrigation district water need period are comprised; during the irrigation district drainage period, field drained water enters a cyclically-adjusting wetland reservoir through a drainage ditch, sediments, pesticides and heavy-metal harmful substances are intercepted and purified through a submerged plant zone and an ecological wetland purification island system, and nitrogen and phosphorus nutrient substances are treated, thus reducing the harms of drainage to the water bodies of rivers and lakes; during the irrigation district water need period, water bodies in the cyclically-adjusting wetland reservoir are extracted by a water extraction pump and distributed to irrigation district farmlands, thus increasing the utilization efficiency of water resources, wherein the residual nitrogen and phosphorus nutrient substances can also be needed by the growth parts of crops. The water-saving and pollution-reducing method disclosed by the invention has the advantages of coupling irrigation and drainage processes in the ecological irrigation district, reducing the influences caused by the drainage of farmland surface source pollutants on rivers and lakes, increasing the utilization efficiency of water resources and chemical fertilizers, and realizing the sustainable development of the ecological water-saving irrigation district agriculture.

Description

technical field [0001] The invention relates to a water-saving and pollution-reducing method suitable for water recycling coupled with irrigation and drainage in ecological irrigation areas in plain areas. It belongs to the field of farmland water conservancy irrigation. Background technique [0002] my country is a large agricultural country, and irrigation has always been developed with the development of social economy. With its special geographical location and superior water resources, irrigation areas play an important role in improving land productivity, meeting people's living needs and developing regional economy. However, traditional irrigation districts often only pursue the output and value of agricultural products while ignoring the protection of the ecological environment, such as over-exploitation of water resources, low water and fertilizer use efficiency, large-scale application of chemical fertilizers, and discharge of pollutants. The existence and use of ...

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Problems solved by technology

In the past, the ecological irrigation area construction technology did not coordinate the relationship between the efficient use of water resources and water purification and pollution reduction, which greatly restricted its application

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