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Construction method of riparian buffer strips for reducing non-point source pollution of broken farmland landscape

A non-point source pollution and farmland landscape technology, applied in chemical instruments and methods, construction, biological water/sewage treatment, etc., can solve the problems of high cost of vegetation planting and maintenance, neglect of economic benefits of buffer zone, etc., to improve ecological benefits, Good water and soil retention capacity, dense stems and leaves

Inactive Publication Date: 2017-05-10
福建师范大学地理研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the layout and construction technology of the riparian zone in mountainous watersheds mostly chose the combination of shrubs and grasses or arbors and grasses. The cost of vegetation planting and maintenance is relatively high, and more emphasis is placed on achieving landscape effects and ecological benefits, while relatively ignoring the economic benefits of the buffer zone.

Method used

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  • Construction method of riparian buffer strips for reducing non-point source pollution of broken farmland landscape
  • Construction method of riparian buffer strips for reducing non-point source pollution of broken farmland landscape
  • Construction method of riparian buffer strips for reducing non-point source pollution of broken farmland landscape

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for constructing a mountainous river bank buffer zone utilizing fast-growing pastures, comprising the following steps:

[0030] (1) Select the riparian land parallel to the river and about 20m between farmland 1 and the river as the construction area;

[0031] (2) To form a relatively gentle terrain with a ground slope of less than 5% by leveling the land for preliminary transformation of the selected area, in order to plant fast-growing grasses;

[0032] (3) Construction of agricultural non-point source runoff catchment water distribution system: build a square water storage ditch with concrete and bricks between the construction area of ​​the buffer zone and the farmland, with a cross-section parallel to the river, and the width and depth are 0.4m respectively , by excavating drainage ditches and connecting farmland drainage ditches to collect farmland receding water and rainfall runoff from farmland confluence, and build a zigzag overflow weir 0.2m above the...

Embodiment 2

[0037] As the method described in embodiment 1, the difference is that, in order to evaluate the buffering and pollution-reducing effect of different width combinations hybrid pennisetum 3 riparian zones, 5 treatment plots are set in the hybrid pennisetum planting width in step (4), altogether, Each treatment plot was arranged perpendicular to the river bank, and each treatment was set up with 2 replicates, which were divided into 10 test plots with a length × width of 20m × 2.5m. The planting patterns of hybrid pennisetum in different treatment zones were 0m abandoned weed land (W20), 15m abandoned weed land+5m hybrid pennisetum (W15+Pe5), 10m abandoned weed land+10m hybrid pennisetum (W10 +Pe10), 5m abandoned weed land +15m hybrid pennisetum (W5+Pe15) and 20m hybrid pennisetum (Pe20).

[0038] After one year of construction, the concentration reduction rates of total nitrogen, ammonia nitrogen and total phosphorus in the surface runoff of different pennisetum hybrid planting...

Embodiment 3

[0040] As in the method described in Example 2, the difference is that, in order to evaluate the response ability of reducing the extreme non-point source pollution risk conditions of the hybrid pennisetum riparian zone in different width combinations, in step (5), the local customary fertilization rate is used as a reference Standard application of inorganic compound fertilizers (N:P 2 o 5 :K 2 O=15:15:15, 45%) 1500kg hm -2 (high concentration) and 750kg·hm -2 (Low concentration) Simulate two concentration eutrophication risk scenarios, discharge the river water as simulated runoff water into the farmland after fertilization, and make the runoff water flow into the buffer zone water storage ditch along the farmland drainage ditch and overflow to the buffer zone Inside, the concentration of different forms of nitrogen and phosphorus in the outflow runoff and the change characteristics of the outflow runoff flow were monitored.

[0041]Monitoring the concentration reduction...

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Abstract

The invention discloses a construction method of riparian buffer strips for reducing non-point source pollution of broken farmland landscape. The method comprises following steps: (1), a suitable construction area on the riverside is constructed; (2), land is levelled and terrain modification is completed preliminarily for planting of fast-growing pasture vegetation; (3), runoff catchment and distribution systems such as water storage ditches, overflow ditches and the like are constructed; (4), fast-growing pasture seedlings with row spacing being 0.5 m and line spacing being 1 m are uniformly planted in the construction area, average plant height of pasture after growing 3 months can reach about 1 m, and dominant communities are formed; (5), a guide flow path is formed by agricultural waste water and rainfall runoff through the runoff catchment and distribution systems, and the agricultural waste water and the rainfall runoff uniformly and slowly flow into the buffer strips and slowly flow into a river after purified by a soil vegetation system. The riparian buffer strips are constructed through planting of the fast-growing pasture grass hybridized pennisetum americanum and simple distribution and catchment engineering measures, so that concentration of nitrogen and phosphorus pollutants of effluent runoff of the buffer strips and water yield are remarkably reduced, and ecological benefits of river water are increased.

Description

technical field [0001] The invention relates to a method for constructing a river bank buffer zone for reducing non-point source pollution of broken farmland landscapes, and belongs to the technical field of environmental protection and agricultural ecological restoration. Background technique [0002] With the growth of population and economic development, water pollution is becoming more and more serious, and agricultural non-point source pollution is one of the main causes of river pollution. Agricultural non-point source pollution mainly refers to the excessive pollutants in the process of agricultural production, such as nutrients, pesticides, soil particles, livestock manure and domestic garbage in the farmland, which are brought about by surface runoff and underground underflow under rainfall conditions. A large amount of pollutants enter the water system such as adjacent rivers, lakes and reservoirs, causing serious pollution of water bodies. Agricultural non-point ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/32E02B3/00
CPCC02F3/32E02B3/00Y02A40/70Y02W10/10
Inventor 林啸仝川卓桂华纪钦阳张健
Owner 福建师范大学地理研究所
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