抚仙湖营养状态评价及营养物水质标准制定

The Trophic Status Evaluation and Development of Nutrient Water Quality Standards for Fuxian Lake

在湖泊富营养化指标筛选的基础上,对湖泊营养状态评价的多种方法进行对比分析,制定湖泊营养物水质标准初始建议值,为更好地控制及治理湖泊的富营养化现象提供科学依据。以抚仙湖为例,通过综合营养状态指数法及国际公认的叶绿素a浓度分级法分别与统计学中的频率分布法相结合对湖泊营养状态进行评价。两种方法的结果显示评价标准差别较小,对抚仙湖营养物总的环境容量影响很小。对两种方法的适用范围进行研究后,确定抚仙湖营养状态及营养物水质标准:抚仙湖为贫营养湖泊,叶绿素a浓度为1.600mg/m3,TP、TN浓度分别为0.006和0.173mg/L,透明度为7.000m。

Some different methods for lake trophic status evaluation were compared based on lake eutrophication index screening, and the preliminary proposal values of the lake nutria＇ill water quality standards developed, in order to provide scientific basis for better control and management of Lake culrophication. Comprehensive trophic status index method and chlorophyll-a content classification method were respectively combined with frequency distribution method in statistics to evaluate the nutrition status of Fuxian Lake. The results showed that the two methods had little difference in evaluation standards and their effects on total environmental capacities were little. After comparing the application scopes of the two methods, nutrient standards were determined. Fuxian Lake belonged to poor nutrient lake, and the nutrient standards of Chl-a, TP, TN, and SD were 1. 600 mg/m^3, 0. 006 mg/L, 0. 173 mg/L, and 7. 000 m respectively.