The limitations and improvements of damage assessment methods for aquatic living resources in protected areas within the diffusion range of pollutants
Through case analysis,it has been observed that the method provided by the"Compilation Guide of the Thematic Argument Report on the Impact of Construction Projects on National Aquatic Germplasm Resources Protection Areas(Fresh Water)"significantly underestimates the results when assessing damage to biological resources and their economic value in Protected Areas affected by pollutant diffusion.The existing method has three main shortcomings:First,it fails to account for the fluidity of the river,treating areas or volumes with predicted pollutant concentrations exceeding standards as if they were actually impacted during discharge;Second,it overlooks the actual utilization rates of plankton by silver carp(Hypophthalmichthys molitrix)and bighead carp(Aristichtys nobilis)in the evaluation of economic loss;Third,it does not adequately consider the high proliferation capacity of phytoplankton.The proposed improved method primarily substitutes the volume in the original calculation formula with the river flow volume through concentration increment zones during wastewater discharge.Additionally,it revises the utilization rates of phytoplankton by silver carp and bighead carp.This refined approach can serve as a reference for further enhancing the assessment method of river living resource loss caused by diffuse pollution.It was found that the density of phytoplankton and zooplankton,the water flow volume through polluted areas,the loss rate of phytoplankton,and the utilization rates of silver carp and bighead carp in relation to phytoplankton all significantly impact evaluation results.Consistency in the application scenarios for these parameters should be maintained during the evaluation of economic losses.
Aquatic living resourcespollution lossprotected areasevaluation methodimprovement
万方数据
维普
