达里湖水质和生物资源量监测及评价

达里湖水质属C1^Na严型，水体中钾离子、钠离子含量较高，而钙离子含量低拮抗作用弱，使得达里湖水对生活于其中的水生动物有较强毒性作用；迭里湖水体中pH值较高、非离子氨含量较高，对水生动物亦有较强毒性，这两个因素是导致迭里湖水生动物种类过少的主要因素。蓝藻门在迭里湖浮游生物中居于主导地位。蓝藻具有的无机碳浓缩机制在蓝藻光合作用过程中可引发水质pH值大幅升高，从而引起暴发性死鱼。迭里湖浮游动物生物量为1．365mg／L，底栖动物生物量为9．91mg／L，都较丰富，但经济鱼类只有鲫鱼和瓦氏雅罗鱼两种杂食性鱼类。饵料资源未能被充分利用。急需找到既能充分利用饵料资源，又能适应这里湖特殊水质的经济鱼类进行放流增殖。

Monitoring and Evaluation on Water Quality and Biology Resource Quantity in DaLi Lake

DaLi lake water type is CINa ,high contents of the top of sodium ions and potassium ions in water, content of calcium ions with weak antagonism effect ,make up in the water for lining in one of the aquatic animal have strong toxicity with high pH and high non-ammonia water in DaLi lake, which has strong toxicity to aquatic animal. These two factors are the main reasons leading to less aquatic animal species in lake. Cyanobacteria dominated in DaLi lake plankton, inorganic carbon concentrating mechanism in cyanobacteria can cause water PH value increased significantly in cyanobacterial photosynthesis process, cause outbreaks of fish died, the abundant biomass planktonic animal and benthic animal in the amount of 1.365mg/L and 9.91 mg/L, hut economic fish only carp and Leuciscus waleckii. Feed resources are not fully utilized. It is urgent to find special economic fish stocking can make full use of food resources, and adapt to lake water quality.