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在汉江中游干流和支流设8个采样点对浮游植物进行监测,共检出浮游植物7门75属173种。硅藻门80种,占46.24%;绿藻门48种,占27.75%;蓝藻门31种,占17.92%;裸藻门8种,占4.62%;隐藻门3种,占1.54%;甲藻门2种,占1.16%;金藻门1种,占0.51%。干流丹江口数量最高,为174×104个/L,回流湾数量最低,为31.8×104个/L;支流唐白河为2588×104个/L。生物量干流皇庄最高,为1.8328mg/L;回流湾最低,为0.1890mg/L;支流唐白河为3.3840mg/L。汉江中游浮游植物数量、生物量总的趋势是越接近下游越高,与过去监测资料相比有逐年增加的趋势,这与水质越接近下游污染越重且污染逐年加重密切相关。
Phytoplankton was monitored at eight sampling points in the mainstream and tributaries of the middle reaches of the Hanjiang River. Seven phytoplankton species belonging to 75 genera and 173 species were detected. 80 species of Diatom, accounting for 46.24%; 48 species of Chlorophyta, accounting for 27.75%; 31 species of Cyanophyta, accounting for 17.92%; 8 species of Euglena, accounting for 4.62%; 3 species of Cryptophyta, accounting for 1.54%; 2 species of algae, accounting for 1.16%; 1 species of kelp, accounting for 0.51%. The number of Danjiangkou in the mainstream is the highest, which is 174 × 104 个 / L, the lowest number of reflux Bay is 31.8 × 104 个 / L, and the tributary of Tangbaihe is 2588 × 104 个 / L. The highest biomass of Huangzhuang, 1.8328mg / L; reflux Bay minimum, 0.1890mg / L; tributary of the Tangbai 3.3840mg / L. The overall trend of phytoplankton quantity and biomass in the middle reaches of the Hanjiang River is closer to the lower reaches, which shows a trend of increasing year by year with the monitoring data in the past. This is closely related to the water quality getting closer to the lower pollution and the pollution increasing year by year.