Method for performing ecological restoration of hardened river banks by mangrove forest plants

A technology of mangrove plants and ecological restoration, applied in the field of ecological restoration of hardened riverbanks, can solve problems such as reducing the self-purification ability of river water, reducing species diversity, destroying riparian biological zones and the living and breeding space of aquatic and land ecotones

Pending Publication Date: 2021-09-10
RES INST OF TROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The hardening of the river bank directly blocks the material and biological exchange between the water body and the soil (land), destroys the survival and rep...

Method used

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  • Method for performing ecological restoration of hardened river banks by mangrove forest plants

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Effect test

Embodiment 1

[0046] A project site is located in the coastal area of ​​a city in the eastern part of Hainan, river total length of 12.8km, the project segment near the river mouth, long 5km, river width 30-100m, depth 0.5-2m, water salinity 5 ‰ -10 ‰, the average bed slope down 3.63 ‰. Tropical marine monsoon climate, annual average temperature of 23.8 ℃, wet and dry quarterly obvious, mainly in the rainy season from May to October.

[0047] The channel is a "smooth on both sides" of the banks hard; dense mixed storm sewage drain channel sides; analysis by sampling and monitoring, water quality is inferior Class V (monitoring data before the implementation of the project 2018), in particular excessive ammonia serious. Overall "hardening", "canal" of the river, so that separation of water and soil, water and biological separation, brutally blocked the ecological function of the river and the shoreline. The project is due to hardening revetment construction, as well as black-odor water ecosystem...

Embodiment 2

[0056] A project site is located in the east bank of the Pearl River Delta, the river is about 15km, 3.9km length of the project area. A subtropical monsoon climate zone, mild and humid, the annual average temperature of 21.8 ℃, average annual rainfall of 1980mm, affected by typhoons, storm surges, red tide. Over the past 20 years, with the development of urban construction, ecological environment along the river suffered serious damage, native mangroves disappeared.

[0057] The dry masonry channel (hardening) the banks on both sides of outfall waterways up to 18, or to provide sewage straight row of storm sewage into the river mouth mixed, causing water black-odor. Sampled monitoring and analysis, the water quality is inferior Class V (monitoring data before project October 2017), in particular ammonia, total nitrogen than the standard (pH 7.19, COD Cr 67.4mg / L, BOD 5 21.9mg / L, NH 4 + -N 9.5mg / L, TP 0.42mg / L).

[0058] Before the project implementation, the status quo f...

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Abstract

The invention discloses a method for performing ecological restoration of hardened river banks by mangrove forest plants. The method comprises the following steps: removing concrete hard banks on two sides of a river channel, and protecting the banks by adopting gabion retaining walls; driving tightly arranged pine piles into a riverbed, 2-3 m away from the banks, on the inner sides of the gabion retaining walls, and filling the area defined by the pine piles and the river banks with soil to form a first beach face; in a river section with a wider river channel cross section and a lower flow speed, forming a stepped slope according to terrains; planting true mangrove plants on the first beach face; and planting the true mangrove plants and semi-mangrove plants sequentially from the near-water side to the near-shore side. According to the method, the maximum water passing amount of the cross section is increased by removing the concrete river banks and adopting the terrain design of the gabion retaining walls and the stepped slope, and the flood discharging function is enhanced. The mangrove forest plants are planted on the two sides of the river, formation of different types of habitats such as the river, mangrove forests and semi-mangrove forests is promoted, various water pollution indexes such as ammonia nitrogen, COD (chemical oxygen demand) and the like are obviously reduced, and DO (dissolved oxygen) is obviously increased.

Description

Technical field [0001] The present invention belongs to the technical field of water quality processing channel, and more particularly, to a method for using a mangrove hardened banks of ecological restoration. Background technique [0002] In recent decades, the need for flood control, some of the South China coastal city near the mouth of the river to take a "smooth on both sides" or "three light" hydraulic engineering control measures. The hardening of the river bank, directly block the water and soil (land) substances of biological exchange, undermining survive and multiply space riparian and surface interlaced with biological, reducing species diversity, reduced self-purification capacity of the river . [0003] Mangrove known as "Coast Guard", "Outback Pioneer made" and "natural filter," said, plays an extremely important role in purifying water, wind and wave dissipation, maintaining biodiversity, carbon sequestration and carbon storage. But how to build ecological restora...

Claims

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Application Information

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IPC IPC(8): A01G17/00A01G22/00E02B3/12
CPCA01G17/005A01G22/00E02B3/12Y02A20/402
Inventor 李玫陈玉军姜仲茂黄烈健
Owner RES INST OF TROPICAL FORESTRY CHINESE ACAD OF FORESTRY
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