How to effectively combine river health assessment with river ecological revetment assessment

At present, there are still differences in ecosystem health assessment. Due to the different types of ecosystems to be assessed, there are many assessment methods and indicators, including ecological characteristics, water resources, basic conditions of rivers, functional integration, socio-political environment and socio-economic indicators.

Among them, ecological indicators are designed at the level of ecosystem and community. The biological density and biomass you mentioned are important indicators of river ecosystem health assessment.

The main ecological indicators are:

(1) Riverbank and riverbed edge vegetation: mainly study the disturbed state and coverage change of vegetation, combining qualitative and quantitative methods;

⑵ River erosion/siltation: it reflects the stability and siltation degree of the river, combining qualitative and quantitative methods;

⑶ Water quality: The water quality of rivers and swamps shall comply with Class III water quality standard in Environmental Quality Standard for Surface Water (GB3838—2002);

(4) Water quantity: expressed by the change rate of existing water quantity compared with historical data;

(5) Water source guarantee or replenishment: measured by water source guarantee or replenishment rate;

(6) Aquatic biodiversity: expressed by the percentage of the animal or plant species in the evaluation area to the animal or plant species in the biogeographic area;

(7) Individual scale or specification of animals: measured by the average scale or size of fish in the same area, the change rate compared with historical data;

(8) Plant individual scale: measured by the average height of dominant plants, and compared with the data recorded in historical data, the change rate is obtained;

(9) Biomass: through the calculation of the biomass of animals or plants, find out the degree of change in their historical periods;

⑽ Threatened state of the river: Based on various human disturbances in the river ecosystem, including excessive fishing and hunting, mowing grass, collecting birds' eggs, reclamation and other coercive factors;

⑾ Decrease or degradation of related wetland area: expressed by the percentage of decrease or degradation of existing wetland area, degradation can be measured by salinization, desertification and vegetation degradation area of wetland, combining qualitative and quantitative methods;

⑿ proportion of soil erosion area;

[13] Salinization area ratio;

3. Landscape elasticity and landscape diversity index.