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Method for recovering submerged plant communities in polluted fresh water area

A technology of submerged plants and recovery methods, applied in the field of recovery of submerged plant communities in polluted freshwater areas, can solve problems such as difficulty in survival

Active Publication Date: 2020-05-26
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, based on the existing literature and research results, it is shown that communities are more difficult to survive than populations, so the restoration scheme based only on light compensation depth taught by the prior art is one-sided

Method used

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  • Method for recovering submerged plant communities in polluted fresh water area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Using existing methods to design a submerged phytoremediation scheme in a certain water area in Hebei

[0035] Research on existing submerged plants and underwater light fields in a certain water area in Hebei Province.

[0036] Regression analysis was performed on the water depth gradient of each monitoring point and the corresponding PAR value. The general formula of the regression equation is:

[0037] I t = I 0 e-αt (1)

[0038] In the formula, I 0 is the PAR intensity at 0m below the water surface μmol(m 2 s); t is the depth m under the water surface, I t is the PAR intensity at depth tm μmol(m 2 s), α is the light attenuation coefficient m -1 .

[0039] In the later stage, the day and night light compensation points of submerged plants and the light attenuation coefficient α of each monitoring point were substituted into the formula to obtain the submerged plant populations and the light compensation depth of the communities at each monitoring ...

Embodiment 2

[0043] Embodiment 2 restores regional submerged plants

[0044] Restore the submerged plants of certain waters in Hebei described in embodiment 1

[0045] 1. Identify dominant species for submerged plant restoration

[0046] 1.1 Layout of sampling points

[0047] The grid layout is the main point of the system layout, and at the same time, the estuary is properly intensified, and a total of 20 sampling points are arranged in this water area.

[0048] Select a cross section perpendicular to the isobath in the water body, set sampling points on the cross section as a small sample, and carry out quantitative collection with weed clips, select several sections, and infer the whole from the sample results.

[0049] According to the characteristics of the water body (size and terrain) and the distribution of aquatic plants (zoning and coverage), select several representative sections. The minimum number of sampling points must include most of the existing species of vegetation, w...

example 1

[0077] By calculating the light compensation point of the submerged plant community collocation of the same dominant species, it is found that the submerged plant community ratio has little effect on the light compensation point, for example, hornwort: asparagus: asparagus: chrysanthemum spica using 1:2 : 1 ratio, the light compensation point of the community is 28.49 μmolm -2 the s -1 , and when the ratio of hornwort: asparagus: asparagus: chrysalis: hydra verticillium is 1:2:1:1, the light compensation point of the community is 29.66 μmolm -2 the s -1 . Therefore, the commonly used ratio of 1:2:1 for engineering restoration is adopted for the basic community of P.

[0078] Among them, the proportions of pollution-resistant species, medium pollution-resistant species and sensitive species are all based on the basic project ratio of 1:2:1, and the subsequent species ratio is 1, and the species of medium pollution-resistant species and sensitive species are added in the earl...

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Abstract

The invention belongs to the field of environmental protection, and particularly relates to a method for recovering submerged plant communities in a polluted fresh water area. The method comprises thefollowing steps that after the composition of submerged plant communities planted in a target water area is determined, according to staged scheme, in a first stage, submerged plant species are planted for collocation and combination; after planting of the submerged plant species in the first stage is completed, the current water depth serves as the light compensation depth of submerged plant restoration in a second stage, and if the transparency under the light compensation depth is larger than or equal to the actual transparency, submerged plant combinations of medium stain-resistant and sensitive species in the second stage are arranged and planted, so that a good submerged plant restoration effect is achieved.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a recovery method for submerged plant communities in polluted fresh water areas. Background technique [0002] There are only 3% of the fresh water resources on the earth, most of which come from Antarctic solid glaciers, and a small part comes from groundwater and freshwater lakes, and freshwater lakes are of great significance to the ecological environment. The ecological environment of my country's freshwater lakes continues to deteriorate, and the water level and water environment quality continue to decline, resulting in the loss of species and the decline in biodiversity, which seriously affects the production and life of local residents, and brings a negative impact on the balance of the local ecosystem and the sustainable development of the region. Great threat. Therefore, managing freshwater lakes and realizing the sustainable development of freshwater...

Claims

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Application Information

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IPC IPC(8): G06F17/18C02F3/32A01G22/00
CPCA01G22/00C02F3/32G06F17/18
Inventor 王颖严俊陈泽豪
Owner BEIJING NORMAL UNIVERSITY
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