Method for calculating ecological environment water demand threshold value

Abstract

The invention provides a method for calculating an ecological environment water demand threshold value, and particularly relates to a method for calculating ecological environment water demand based on an ecosystem health grade method and a restoration grade proposal method. The method uses ecosystems of various types comprising rivers, lakes, wet lands and dry land natural vegetation and urban natural systems as an interactional whole, divides the ecological environment water demand into different grades such as minimum, proper, ideal and the like according to the ecological environment water demand safe threshold value theory, and is contacted with the ecosystem health level so as to establish an integral estimation model of the ecological environment water demand. The method is closely connected with the health condition and restoration grade proposal of the ecosystem, and has the advantages of definite management target, consistency with related planning, strong systematization, easy data acquisition, simplicity and feasibility, and the like.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for calculating an ecological environment water demand threshold, in particular to an ecological environment water demand calculation method based on an ecological system health level method and a restoration level scheme method. Background technique [0002] The water requirement of the ecological environment is an important basis for maintaining the normal structure and function of the ecosystem, and it is also an important factor that must be considered in the allocation of water resources. At present, most of the assessments at home and abroad focus on the water demand of the river ecological environment, such as the relationship between river flow and fish habitat, the relationship between river flow, aquatic organisms and dissolved oxygen, and the relationship between aquatic biological indicators and flow. The evaluation methods in the field of evaluation of ...

AI Technical Summary

Problems solved by technology

Although there are studies on the water demand of other types of ecosystems, such as dry land vegetation, lakes, wetlands, estuaries, cities, etc., they are all aimed at a single ecosystem, and a complete set of water demand evaluation system and calculation methods have not been formed. The amount of water allocated to these ecosystems by the water resource management department is used to determine the water demand

Therefore, the current calculation method of ecological environment water demand is difficult to determine the ecological environment water demand from the perspective of the ecosystem's own water demand, and it lacks consideration of the correlation and interaction between various types of ecosystems, ignoring the overall health level of the ecosystem and water relationship

In addition, most of the existing results are quantitative values, not interval values

According to the self-organization theory, the ecosystem can withstand changes in water volume within a certain range, but if the reduction or increase of water volume exceeds the tolerance range of the system, the self-organization and self-adjustment capabilities of the system will be lost. In view of the objective existence of this threshold , the existing research results cannot objectively indicate the relationship between ecosystem water demand and its health

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