Method for determining total nitrogen water ecological reference threshold value

Abstract

The invention discloses a method for determining a total nitrogen water ecological reference threshold value. The method comprises the steps: based on an artificial aquatic microcosm technology, establishing a multi-nutrition-level, multi-species and multi-ecological-parameter microcosm system containing a phytoplankton-zooplankton food net; screening a potential ecological response factor to construct a nutrient-phytoplankton-zooplankton food net pressure-response relationship, carrying out the quantitative description, and obtaining a threshold value causing plankton community structure changes. The method has the advantages that the method for determining the total nitrogen water ecological reference threshold value at the ecological system level based on the indoor experiment is provided for the first time, indoor verification can be conducted on the threshold value derived based on the field investigation experiment, and meanwhile the method has important significance in determination of the total nitrogen water ecological reference value and pollution prevention and control. The method has the characteristics of simplicity, convenience, wide application range and high practicability, and the scientificity, reliability and operability of total nitrogen water ecological reference threshold research are improved.

Description

technical field [0001] The invention relates to the technical field of environmental science water body protection, in particular to a method for determining the threshold value of total nitrogen and water ecology benchmarks based on artificial aquatic microcosm technology. Background technique [0002] Water is an essential resource and a vital life support factor. On the world hydrological map, eutrophication is one of the important reasons leading to the degradation of freshwater ecosystems. Excessive enrichment of nutrients (especially nitrogen and phosphorus) leads to the transformation of oligotrophic water bodies into mesotrophic state, eutrophication, and finally hypereutrophication. Eutrophication is the depletion of oxygen in freshwater ecosystems due to overgrowth of algae and the death and decomposition of algae, which shrinks the essential ecosystem services of freshwater ecosystems (such as drinking water supply, provision of recreation, fish and wildlife habi...

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Problems solved by technology

[0006] At present, the determination of the threshold value of total nitrogen and water ecology is mostly based on derivation after field survey experiments (such as using the frequency distribution method and critical indicator species analysis method). Derived from the research, it has certain limitations, and its accuracy needs to be further verified by indoor experiments.

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