Rainwater collection and water-saving irrigation pollution control system and method for sloping field

Abstract

The invention relates to a rainwater collection and water-saving irrigation pollution control system and method for a sloping field, wherein contour no-tillage straw mulching and contour plant hedgerow measures, rainwater collection cellars and gravity trickle irrigation equipment are comprised. The rainwater collection and water-saving irrigation pollution control method comprises the following steps of: designing 2-4 rainwater collection cellars from a slope top to a slope bottom according to the terrain of a river basin sloping field, wherein the sloping fields which is positioned above the rainwater collection cellars and subjected to the contour no-tillage straw mulching and contour plant hedgerow measures are taken as rainwater collection surfaces, and the rainwater collection cellars are mainly built in a semi-underground way, provided with two rainwater outlets along the ground and cellar bottoms and respectively connected with 2-4 gravity trickle irrigation equipment; and carrying out partitioning gravity trickle irrigation on sloping farmlands positioned below the rainwater collection cellars. The invention can effectively reduce the pollution of water losses and soil erosion on a water body by carrying out space-time integrated regulation and control on the water losses and soil erosion of the sloping field and the redistribution of collected rainwater according to the change of raining time and the characteristics of the sloping field, and solve the problem that the sloping field can not be irrigated in a dry season through the redistribution of the collected rainwater, thereby enhancing the multiple-cropping index and the output of crops of the sloping field; and in addition, the invention can be widely used for the integrated management and control of therainwater for the sloping fields in the southwest regions in China.

Description

technical field [0001] The invention belongs to the technical field of farmland water conservancy, and in particular relates to a system and method for rain-collecting irrigation and pollution control on sloping land. Background technique [0002] The average annual rainfall in the Erhai Lake Basin in Yunnan Province is 1089mm, mainly concentrated in May-October, accounting for 89% of the annual rainfall. The seasonal drought is severe, resulting in serious soil erosion in the rainy season and severe water shortage for crops in the dry season. The problem. The total land area of ​​the basin is 2565.0km 2 , while the slope soil erosion area is 880.44km2, of which: light 389.2km2 2 (accounting for 44.2% of the total erosion area), moderate 392.8km 2 (accounting for 44.6% of the total eroded area), the intensity is 93.8km 2 (accounting for 10.7% of the total eroded area), extremely strong 4.6km2 (accounting for 0.5% of the total eroded area). The average soil erosion modul...

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Problems solved by technology

[0003] In the existing public technology, the technology or method mainly focuses on the accumulation of rainwater (application publication number CN101933449) or the control of soil erosion on slopes (CN101785394A), but lacks the comprehensive regulation of rainfall on slopes in time and space, that is, how to effectively control soil erosion in the rainy season , Rainwater storage and efficient use of water collection and storage in dry seasons, so as to achieve the purpose of rationally controlling and distributing rainwater in time and space

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