随着近海富营养化程度呈日趋严重，有害藻华发生频率和面积均呈增加态势。但迄今有害藻华尚不能准确预测预报，针对发生在近海特殊海域（如养殖区、风景区、重要国内外赛事水域等）的有害藻华需要应急处置或防控。目前，改性粘土技术已在近海有害藻华治理中得到多次成功应用。虽然在粘土材料选择、改性处理及制备等各环节均已充分考虑了对环境和生物的安全性，以往研究也表明改性粘土在有效去除藻华生物的浓度下对水生生物无毒副作用等，但关于改性粘土治理有害藻华对生态环境的影响尚未开展系统的研究。本项目将针对有害藻华自然消亡和利用改性粘土絮凝沉降两种不同体系，从水质环境和底质环境两方面入手，开展对比研究，重点考察改性粘土絮凝对典型水生和底栖生物生长繁殖的影响以及生物的耐受力和响应机制，通过现场实验对比研究两种体系底栖生物群落组成的变化情况，阐明改性粘土治理有害藻华的生态环境效应，为我国近海有害藻华的合理有效防控提供科学依据。

As we all know, harmful algal blooms (HABs) have been becoming in an increasing trend both in the frequency and range accompany with the more serious coastal eutrophication. But so far HABs still cannot be forecasted accurately. So some cases HABs need to deal with emergencies or prevention and control if it occurs in some special coastal waters (such as culture areas, scenic areas, some important international and domestic competitions waters etc.). Now it is confirmed and has been used successful in coastal areas several times that modified clay is the preferred and effective method to coagulation HABs. Although modified clays have been proved friendly to the environment and is safe to the aquatic organism in the concentration of effective removal of HABs. However, as for the eco-environmental effects by using modified clays coagulation HABs could not give a clear answer up to now. In this project comparative research will be conducted between the natural death and modified clay flocculation for HABs systems. Both aquatic and benthic environment, including the important water and depositional parameters, will be studied with the comparative research. The biological tolerance and response mechanisms of some typical aquatic and benthic organism on modified clay flocculation HABs will be pay more attention. The eco-environmental effects by using modified clays to control HABs will be expected to clarify according to the above researches and field experiment on benthic community composition between the natural death and modified clay flocculation systems. Results produced by this project will provide a scientific basis for the effective and reasonable prevention and control HABs in the coastal areas in China.