Method for evaluating effect of seriously-polluted lake dredging on bottom mud microbe ecological system structure and function

Abstract

The related evaluation method to effect to microbial ecosystem structure and function when dredging serious-polluted eutrophic lake comprises: selecting different dredging technologies and area as well near un-dredged area, arranging monitor points; collecting sample, detecting objective structure and function before and after dredging, analyzing key enzyme activity to evaluate the effect and determine the ecosystem function.

Description

technical field [0001] The present invention relates to lake pollution control and restoration or reconstruction of aquatic ecosystems, and furthermore, how to evaluate the ecological risk of ecological dredging of eutrophic lake sediments, especially the impact of dredging of heavily polluted lakes on the structure and function of sediment microbial ecosystems impact assessment method. Specifically, it is a detection method for effectively evaluating the impact of the dredging project on the microbial community structure and function of the sediment before, during and after the dredging of the lake sediment. Background technique [0002] In order to control lake sediment pollution and prevent the occurrence of cyanobacteria blooms, people often choose dredging projects based on the consideration that nutrients are an important factor in the formation of cyanobacteria blooms, as a way to remove endogenous nutrients accumulated in the sediment an...

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Problems solved by technology

However, the application of this technology is not very applicable in the evaluation of ecological risk of sediment dredging

Because the lake itself is flowing and an open system, and the structure of the plankton community also has seasonal and annual changes, it is impossible to distinguish whether the change in the plankton community structure is caused by the dredging project or other factors in a short period of time. The result of its own seasonal or annual changes; although the community composition of benthic animals is relatively stable, its biomass is generally relatively scarce in heavily polluted lake areas, and the small sample makes the evaluation results obtained by traditional ecological methods inaccurate. Reliability declines; and the detection of microbial community composition generally adopts the traditional technology of indoor plate culture medium after sampling in the field at present, but according to relevant literature, because many microorganisms cannot survive on the culture medium indoors, at most only the original information on 1% of the microbial population in the environment

Due to these uncertain reasons, there is no unified standard for ecological risk assessment of lake sediment dredging, so it is impossible to scientifically assess the effects and risks of sediment dredging in solving the problem of lake eutrophication. Evaluation

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