三峡水库"藻类水华"成因条件研究

在对三峡水库"水华"监测研究的基础上,从水库运行、水文、气象、温度、富氮、富磷、生化降解速率、pH环境、缓流水态角度,深入剖析了大型水库富营养化的特征和成因条件,指出水力学条件的改变是引发"水华"的基础,确定了水利工程运行形成的特殊水文情势,人文、物理、化学、生物过程沉淀、吸附、解吸和生物降解之间相互作用的综合过程导致水华的爆发,同时具有发生频繁、消失快的特点.指出库水总磷含量大,以泥沙吸附颗粒态磷、游离颗粒态磷、胶粒态磷、溶解态磷等多种形态存在,各种磷组分与藻类生长在适应的环境因子和生物因子的作用影响机理下形成了复杂的协同作用,加速增强了藻类生长过程,以至爆发"水华".提出防治三峡"水华"是一项多学科攻关的系统工程.

Investigation on alga bloom cause of Three Gorges reservoir

On the basis of alga bloom monitoring and research in Three Gorges reservoir,eutrophication feature and happening condition of large type reservoir are throughly analyzed in the view of reservoir operation,hydrology,meteorology,temperature,N and T contents,biochemical degradation,pH environment,slow-flowing state and it is indicated that the change of hydraulic condition is the basic condition causing alga bloom and comprehensive effect process of special hydrological regime,human activity,biological sedimentation process,absorption, desorption and biodegradation causes alga bloom.The alga bloom features frequent taking place and fast disappearing.The alga bloom control for Three Gorges reservoir is a systematic and multi-subjects works.