Characteristics of Atmospheric Nitrogen Wet Deposition in Jinpen Reservoir of Heihe River
In order to investigate the pollution characteristics of atmospheric nitrogen wet deposition in Jinpen Reservoir of Heihe River,atmospheric nitrogen wet deposition monitoring was carried out in the main reservoir area of Jinpen Reservoir for a period of one year,and the characteristics of the concentration and deposition fluxes of the main nitrogen pollutants and the factors affecting them were analyzed.The results showed that the mean total nitrogen wet deposition mass concentration in Jinpen Reservoir during the monitoring period was 2.80 mg/L,which mainly consisted of nitrate nitrogen and ammonia nitrogen,with a proportion of 28%and 46%,respectively;total nitrogen wet deposition concentration was highest in winter at 4.70 mg/L;the ratio of wet deposition ammonia nitrogen to nitrate nitrogen mass concentration is greater than 1.Agricultural activities are an important source of wet deposition nitrogen;the total nitrogen wet deposition flux was 29.74 kg/hm2,accounting for 1.7%of the total runoff nitrogen input load;nitrogen wet deposition fluxes were significantly and positively correlated(P<0.05)with precipitation;single factor water quality evaluation results show that the reservoir area precipitation water quality is mostly inferior class V,total nitrogen inferior class V exceeded the rate of 75%;the level of atmospheric nitrogen wet deposition in Jinpen Reservoir has exceeded the critical load of nutrient nitrogen deposition in major lake reservoirs in China,and the risk of eutrophication of water bodies in the reservoir area is high.
万方数据
维普
