Health assessment of aquatic ecosystem of Yuehai Lake in Yinchuan
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Abstract:
The water ecological and water environmental factors were sampled to ascertain the health status of the aquatic ecosys tem of Yuehai Lake in YinChuan in winter (January), spring (April), summer (July) and autumn (October) from 2015 to 2017. Nine factors such as chlorophyll (China) , comprehensive nutritional status index (TLI(∑)) , phytoplankton biomass (D), benthic Shannon-Wiener index(H＇Aquatic plant) ,and aquatic plant Shannon-Wiener index(H＇Benthic) , permanganate index (CODmh), total nitrogen (TN), ammonia nitrogen (NH3-N), total phosphorus (TP) were selected to establish evaluation index system u- sing principal component analysis (PCA) for the health assessment of the aquatic ecosystem in Yuehai Lake. The PCA method was used to determine the weight of the index, while the gray relational method was used to evaluate the health level of the a- quatic ecosystem. The results showed that the health assessment grades of the aquatic ecosystems in the spring, summer and au tumn were all sub-health from 2015-2017, whereas in winter, the status was healthy. The extreme level of nitrogen and phos phorus nutrients were the main cause of sub-health in Lake Yuehai from 2015-2017.
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