The DCCA ordination of 95 attached diatom species three main headwater rivers of in 11 sampling points of Fenhe Reservoir was made and these points 4 groups indicating the water qualities of ? mesosaprobic, ? mesosaprobic, oligosaprobic and clean zone.

• 对汾河水库3条主要水源河的11个样点95个着生硅藻进行DCCA排序；这11个样点可分为4组；分别指示水质属于-中污带、-中污带、寡污带和清洁带；DCCA第一轴可反映水体污染程度；第二轴反映河流的流速.