Study On The Characteristics And Quality Evaluation Of Water Environment In Dashanbao Wetland

Dashanbao The mountain pack is a national nature reserve and national park.It is also an important international wetland.The wetland type is mainly based on the reservoir(the Tiaondunhe reservoir and the Dahaizi reservoir)and the wetlands of sub-alpine marshes.It is the main wintering habitat of the black-necked crane.It the most important agricultural irrigation and drinking water,is zhaoyang district west town and made the adjacent mountains,fields of dam and stockade of four villages and towns is the most important agricultural irrigation and drinking water.The water environment,especially the quality of the water quality,is directly related to the safety of the black necked cranes and the social and economic development of the region.This paper analyzes the spatial and temporal changes in the water environment of the wetland,Based on the Tiaondunhe reservoir and the Dahaizi reservoir respectively arranged eight sampling points in March 2014 to February 2017,a total of 15 water temperature,ammonia nitrogen,total nitrogen,total phosphorus,potassium permanganate index and so on 11 quality testing data,the physical and chemical factors.Evaluate the environmental quality of wetland water with the single factor evaluation method,the Nemerow pollution index method,fuzzy comprehensive evaluation method and comprehensive nutrition state index method.Researches show that:1.The seasonal variation of water temperature is obvious,the change of spring and autumn season is big,the change of summer and winter is small.There was a decline in TP,CODMn,BOD5,fecal coliform and SD.There is no significant change in TP and BOD5.In 2014,the CODMn was the largest and the largest concentration occurred in May,at 7.3 mg/L,and the total was between 0.9 and 3.1 mg/L in 2015 to 2016.The CODMn of Dahaizi reservoir sub-reservoir was between 1.2 and 13.2 mg/L in 2015.In addition to a different point,fecal coliform concentration fluctuation change of Tiaodunhe reservoir from 2014 to 2016.In March 2014 to July 2016,fecal coliform range is big of Dahaizi reservoir value is between 700 ~ 16000 / L.In 2014,the total hardness was small,the value was between 9.5 and 15.7 mg/L,and the total hardness concentration was highest in March 2015,with a value of 53 mg/L.The concentrations of chlorophyll a in Tiaodunhe reservoir and Dahaizi reservoir were 157ug/m3 and 472ug/m3 in March 2014.The chlorophyll a concentration was lower than 25ug/m3 in the rest of the period.No significant change in the time of NH3-N,and more than 95% of the test data were under 0.6 mg/L.2.Water temperature,NH3-N,TN and TP vary little from reservoir to reservoir,and the seasonal difference is obvious,and the concentration value is: rainy season < dry season.Water temperature,NH3-N and TN concentration values are as follows: Dahaizi reservoir > Tiaodunhe reservoir.In the dry season,the levels of DO and chlorophyll a have been found in the "sea sub-reservoir",which is 6.5 mg/L,3.1mg/L.Chlorophyll a is significantly larger than the rainy season in the dry season of the reservoir.During the rainy season and in the dry season the BOD5,the total hardness and the fecal coliform colonies are distinct from the reservoir bank of the reservoir.The CODMn is converted into the rainy season,the tipton reservoir.3.Using the principal component analysis(PCA),the first principal component is associated with CODMn,BOD5,coprolium,total phosphorus and ammonia nitrogen.The second principal components related to the dissolved oxygen,chlorophyll a and total nitrogen.The third principal component as the water temperature,the fourth principal component for total hardness.4.The sea son reservoir compared with TiaoDunHe reservoir eutrophication degree is high overall,the main reason is that the sea son reservoir water area is lesser,database is smaller,the reservoir itself of self-regulation is poorer,and affected by human activities is bigger.In 2014 to 2016,Nemerow index decreased year after year,as follows: 2014 >2015 >2016.In 2014 to 2016,made the wetland water quality by ? turn good for ?,present the better water quality trend,the main reason is that reserve implementation of large area of farmland and grassland,farmland to wet licks caused by ecological restoration,ecological engineering,and related to the management consciousness of local residents wetland has been increasing.In summary,the analysis of temporal and spatial variation characteristics of water environment and water quality evaluation of wetland in Dashanbao wetland can provide theoretical basis for the management,protection and rational utilization of Wetland.