Multistage ecological system for preventing and controlling agricultural non-point source phosphorus loss

An ecosystem and agricultural technology, applied in the field of multi-level ecosystems, can solve the problem of not taking into account the capacity of non-point source runoff absorption, and achieve the effect of improving the level of environmental management, the effect is remarkable, and the effect of comprehensive prevention and control is achieved.

Inactive Publication Date: 2020-04-10
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these inventions considered the absorbing capacity of non-point source runoff under heavy rainfall conditions.

Method used

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  • Multistage ecological system for preventing and controlling agricultural non-point source phosphorus loss
  • Multistage ecological system for preventing and controlling agricultural non-point source phosphorus loss
  • Multistage ecological system for preventing and controlling agricultural non-point source phosphorus loss

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Embodiment

[0042] This embodiment is a comprehensive control project of agricultural non-point source phosphorus loss in a certain river basin in the Three Gorges reservoir area. The catchment area of ​​the project is 757 mu, of which the part above 280m above sea level is the area for returning farmland to forest, and the vegetation coverage reaches more than 80%. The storage level is 175m. The flood intercepting ditch 10 has a total length of 320m, a masonry trapezoidal section, a top width of 1m, a bottom width of 0.6m, a height of 0.8m, an inner slope of 1:0.2, and a slope ratio of 3% for the flood intercepting ditch 10 .

[0043] like image 3 As shown, drainage ditches 11 are longitudinally distributed in stone ridge terraces. The drainage ditches are open channel rectangular sections, and 1:2 waterproof mortar is used to build the ditch walls. The bottom of the ditch is plain concrete (C25) with a thickness of 0.1m. The ditch wall height is 0.5m, the wall width is 0.12mm, and th...

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Abstract

The invention discloses a multistage ecological system for preventing and controlling agricultural non-point source phosphorus loss. The multistage ecological system is distributed in a terrace with natural fall according to a sloping field, and comprises: a desilting and water-catching system which is distributed in the whole sloping field and comprises a flood intercepting ditch, a drainage ditch and a grit chamber; a plant fence-ecological ditch system which is distributed in the sloping terrace and comprises a plant fence and an ecological ditch; a step bank wetland which is positioned onthe sloping field at the lower part of the terrace; and a phosphorus-rich ecological embankment which is positioned at the lower part of the sloping field and above a hydro-fluctuation belt. The multistage ecological system for preventing and controlling agricultural non-point source phosphorus loss can effectively intercept and control reservoir area small watershed slope cropland agricultural non-point source phosphorus loss, reduces water and soil loss, purifies rainfall runoff, and prevents and controls eutrophication of reservoir area water bodies, especially branch water bodies of largeartificial reservoirs.

Description

technical field [0001] The invention relates to the technical field of non-point source pollution control, in particular to a multi-level ecosystem for preventing and controlling the loss of agricultural non-point source phosphorus. Background technique [0002] The management of non-point source loss of water and soil, nitrogen and phosphorus in sloping farmland in the basin has been the focus of water and soil conservation and environmental protection in recent decades. Non-point source pollution mainly comes from the nutrients carried by surrounding farmland runoff and soil erosion, both of which are produced in the process of rainfall runoff, especially under heavy rainfall conditions, with the rainfall runoff and sediment carrying a large amount of nutrients such as nitrogen and phosphorus. Agricultural non-point source phosphorus loss is mainly controlled by technologies such as constructed wetlands, ecological ditches, terraced fields, and plant hedges. The characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/32E02B3/06E02B3/12E02B5/00E02B11/00E03F5/10
CPCC02F3/32C02F2001/007E02B3/06E02B3/12E02B5/00E02B11/00E03F5/10Y02A10/11
Inventor 李晔韩惟怡李柏林刘冬雪周育智刘东斌
Owner WUHAN UNIV OF TECH
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