Ecological assessment of water quality of the Songhua River upper reaches by algal communities

Ecological analysis of 77 phytoplankton species preferences in the Songhua River upper reaches was doing in purpose to assess the river water quality dynamic with using of bio-indication methods implemented in first time for China. Results show that studied part of the river can be divided into two different parts — upper stations between Fullness Dam above Jilin settlement and below Jilin up to Zhenjiang port. Algal community structure and species richness are dramatically change with increasing number of species and productivity of community. The water chemistry show increasing of total suspending solids after the Jilin accompanied input of phosphates and nitrates where agriculture doing impact of the river water quality. Bio-indication characterized the river upper reaches as inhabit by rich phytoplankton community prefer photosynthetic type of nutrition on the upper stations and enriched by facultative heterotrophic taxa in the lower stations, and water as low-alkaline, low-saline, middle oxygenated, with increasing of nutrients and organic pollution down the river, where change from mesotrophic to eutrophic state. The major variables that impacted algal diversity were the nutrient-related such as nitrates and phosphates concentration. The water quality was dramatically changed from low polluted Class III in upper stations to polluted Classes IV and V in lower stations. Indices of the photosynthesis activity (WESI) revealed low-toxicity impact in all studied part of the river but indices of saprobity show high self-purification capacity down the river.

抽象的在松花江上游77浮游植物种类的喜好生态分析,在做的目的,评估河流水质的动态使用在中国第一次实现生物指示的方法。结果表明,河流的研究的一部分,可以分成两个不同的部分 - 上面吉林结算及以下的吉林丰满大坝的上站至镇江港。藻类群落结构和物种丰富度正在显着的增加种群和群落生产力的数量变化。该水化学节目吉林后,总悬浮固体的增加伴随着磷酸盐和硝酸盐的投入,其中农业做的河流水质的影响。生物指示表征河上游的栖息通过丰富的浮游植物群落喜欢光合型营养在上站和兼性异养类群在较低的车站充实,水作为低碱性,低盐水,中含氧,随营养物质和有机污染顺流而下,这里的变化,从营养型向富营养状态。该影响藻类多样性的主要变量是营养素相关如硝酸盐和磷酸盐的浓度。水质量显着低污染III级在上站污染的IV类和V改变降低了站。光合作用活性(WESI)的指数表明在河但saprobity显示高自净能力顺流而下指数的所有研究的一部分,低毒性的影响。