摘要
为了解拉萨河秋季着生藻类多样性及水质状况,2017年秋季对拉萨河流域开展了较系统的水环境和着生藻类研究。1)对采集到的样品进行藻类鉴定与分析,现场采用水质测量仪测量水质理化参数。拉萨河秋季共鉴定出着生藻类32种属,以硅藻、绿藻和蓝藻为主,硅藻占总种属的50%。着生藻类平均生物量为0.049 mg/cm^(2),生物量偏低,属于贫营养型水体。2)通过Shannon-Wiener多样性指数、Margalef丰富度指数和Pielou均匀度指数评价拉萨河秋季水质状况,拉萨河流域直孔电站上游3个采样点的水质优于电站下游4个采样点。3)通过对着生藻类的优势类群与环境因子参数的典范对应分析(CCA)显示,第Ⅰ类群与溶解氧(DO)呈显著负相关性,与电导率(CON)和总氮(TN)呈显著正相关性;第Ⅱ类群与DO呈显著正相关性,与电导率(CON)、pH、水温(WT)、TN和流速(Flo)呈负相关性;其中流速(Flo)与大部分生物类群呈负相关性。期望本研究成果能够为高原河流生态环境保护和管理提供科学依据。
Lhasa River is one of the most seriously disturbed plateau rivers with unique biological resources and fragile ecological environment.In order to understand the diversity and water quality of periphytic algae in the Lhasa River in autumn,a systematic study on the water environment and periphytic algae was carried out in the Lhasa River basin in autumn 2017.First of all,algae identification and analysis were carried out on the collected samples,and water quality measuring instrument was used to measure the physical and chemical parameters of water quality.A total of 32 species of periphytic algae were identified in Lhasa River in autumn,and were composed of Bacillariophyta,Chlorophyta,and Cyanophyta.and Bacillariophyta accounted for 50%of the total species.The average biomass of periphytic algae was 0.049mg/cm^(2),which is relatively low and belongs to poor nutrition water body.Secondly,the water quality of the Lhasa River in autumn was evaluated by Shannon-Wiener index,Margalef biodiversity index and Pielou evenness index.The water quality of the three upstream sampling points of the directly hole power station in the Lhasa River basin was better than that of the four downstream sampling points.Then,canonical correspondence analysis(CCA)between dominant groups of periphytic algae and environmental factors showed that group I was significantly negatively correlated with dissolved oxygen(DO)and positively correlated with electrical conductivity(CON)and total nitrogen(TN).Group II was positively correlated with dissolved oxygen(DO)and negatively correlated with conductivity(CON),pH,water temperature(WT),total nitrogen(TN)and flow velocity(Flo).The velocity of flow(Flo)was negatively correlated with most biological groups.Finally,the results of this study are useful for the ecological protection and management of plateau rivers.Institute of Fisheries Science,Tibet;Academy of Agriculture and Animal Husbandry Sciences,Lhasa 850032,China.
作者
扎西拉姆
周建设
潘瑛子
Tashilhamo;Zhou Jianshe;Pan Yingzi(Institute of Fisheries Science,Tibet Academy of Agriculture and Animal Husbandry Sciences,Lhasa 850032,China)
出处
《环境工程》
CAS
CSCD
北大核心
2023年第S02期774-778,共5页
Environmental Engineering
基金
国家特色淡水鱼产业技术体系(CARS-46)
关键词
拉萨河
着生藻类
群落结构
水质评价
Lhasa River
periphytic algae
community structure
water quality evaluation
