A method for intercepting farmland nitrogen and phosphorus runoff by utilizing ecological ditches and ponds embedded in buffer zones

Abstract

The invention relates to a method for intercepting farmland nitrogen and phosphorus runoff by utilizing ecological ditches and ponds embedded in buffer zones, and belongs to the technical field of agricultural environment protection. The method includes constructing farmland buffer zones along two sides of a river; arranging isolation zones in the buffer zone close to the river at one side to further prevent farmland runoff in the buffer zone from entering the river in a lateral seepage manner. Runoff generated in farmlands gradually gathers in the farmland buffer zones, zigzag ecological ditches and an ecological multiple-pond system are constructed in the buffer zones, the multiple-pond system achieves water communication through the ecological ditches, nitrogen and phosphorus in the farmland runoff are intercepted and purified by utilizing the ecological ditches and pounds in the buffer zones, and farmland tail water after purification is discharged into the river through an anaerobic pond water outlet. The original farmland layout is fully utilized, and the structure and functions of "farmland buffer zone-ecological ditch-ecological pond" in the farmland ecological system are utilized, thus achieving interception and purification of farmland nitrogen and phosphorus runoff and improving farmland self-cleaning capability for nitrogen and phosphorus areal-source pollution andlandscape effects.

Description

technical field [0001] The invention belongs to the technical field of agricultural environmental protection, and specifically relates to a method for intercepting farmland nitrogen and phosphorus runoff by using an ecological ditch embedded in a buffer zone. Background technique [0002] Nitrogen and phosphorus are important raw material elements and the fundamental elements to promote the sustainable development of agriculture. However, the excessive input of nitrogen and phosphorus fertilizers in farmland brings about the loss of nitrogen and phosphorus in farmland, which is one of the most important sources of pollution in agricultural non-point source pollution. The hardening of ditches in the field or the lack of interception functions such as farmland buffer zone and ecological ditches and ponds have caused Nitrogen and phosphorus flowing out of the fields are difficult to completely intercept and purify in hardened ditches and soil ditches, and are discharged into th...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many domestic and foreign methods of intercepting farmland nitrogen and phosphorus runoff using single measures such as ecological ditches, ecological ponds, and buffer strips, but few ecological ditches and ponds are embedded in buffer strips, making farmland buffer strip-ecological ditch-ecological pond Organic integration for ecological interception of farmland nitrogen and phosphorus runoff

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