Diversity and ecological health assessments of aquatic plants inhabiting northern suburb wetland of Zhangye City
Aquatic plant diversity and ecological health assessment are of great significance to the integ-rity and stability of wetland ecosystem.Taking Zhangye northern suburb wetland as an example,the a-quatic plant community,water quality index and wetland health status were studied by combining field investigation and observation,indoor measurement and analysis,numerical calculation and simulation.The results showed that the water quality of the wetland in the northern suburb of Zhangye was good,and the average contents of DO,TP,NH3-N and NO2-N were low,which was in line with Class Ⅰ or Class Ⅱ water quality.The contents of TN,NO3-N and COD were high,which conformed to Class Ⅳ water quality,indicating that nitrogen and organic matter are the main pollutants in wetland water.There were 14 orders,18 families,21 genera and 26 species of aquatic plants,all of which belong to an-giosperms.The monocotyledonous plants had 10 orders,12 families,15 genera and 20 species.Dicoty-ledonous plants consisted of 4 orders,6 families,15 genera and 20 species,among them Potamogetonc-rispus,Schoenoplectus tabernaemontani and Phragmites australis have a wide distribution range.A-mong the 25 stations,9 were in sick condition.There were 5 subpathological and critical stations.There were 4 sub-healthy stations.There were 2 healthy stations.From the eigenvalues and index weights of each subsystem level,we can see that the main factors affecting system health were water quality,hydrology and aquatic plant indexes.The results of this study are of a great significance for un-derstanding the influence of different water environmental factors on aquatic plant diversity,and impro-ving effective management measures and technical support for northern suburban wetlands through wetland ecosystem assessment.
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