A method for ecological control of agricultural non-point source pollution in rice planting areas

Abstract

The invention discloses an ecological method for abating agricultural non-point source pollution in rice planting regions. According to the method, the whole process from the time when the agricultural non-point source pollution flows out of the farmland to the time when the agricultural non-point source pollution enters a downstream receiving water body is considered, the specific pollution decreasing technology containing three defense lines is provided, source control for reducing agricultural non-point source pollution emission through filed water-saving irrigation and comprehensive water-fertilizer regulation serves as the first defense line, agricultural non-point source pollution removal and purification conducted through ecological ditches serves as the second defense line, agricultural non-point source pollution removal and purification conducted through small reservoirs and wet land serves as the third defense line, the three defense lines are in a series connection relation, in other words, the head end is provided with the first defense line, the first defense line is linked to the second defense line, and finally the second defense line is linked to the third defense line. By means of the ecological method, the effect of discharging and purifying nitrogen and phosphorus in the agricultural non-point source pollution is good, the utilization rate of nitrogen and phosphorus is raised, construction cost and operation cost are both low, plant diversity of the rice irrigation regions is enriched, and the method is suitable for being popularized in the regions in the South where rice is planted.

Description

technical field

[0001] The present invention relates to the technical field of agricultural water conservancy, in particular to an ecological control method for agricultural non-point source pollution in rice planting areas with comprehensive source control, three defense lines of ecological ditches and ponds and weirs, especially suitable for agricultural non-point source pollution in southern rice irrigation areas governance. Background technique

[0002] In recent years, due to the limitation of land resources, increasing grain yield per unit area is the main measure to increase grain production in my country. At present, one of the measures to increase grain yield per unit area is the high input of resources such as fertilizers, resulting in low resource utilization and increased environmental pollution. According to statistics, the current input of chemical fertilizers per unit area in my country is 2.6 times the world average level. Excessive input of chemical fertiliz...

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