洱海富营养化评价及其影响因素分析

Eutrophication Evaluation and Analysis on Its Influencing Factors of Erhai Lake

摘要: 为了解洱海富营养化状况,通过现场调研及资料收集,研究了洱海总氮(TN)、总磷(TP)、高锰酸盐指数(COD_Mn)、透明度(SD)、叶绿素a (chla)与综合营养状态指数TLI(∑)的相关性及富营养化的影响因素。结果表明:①2008-2017年,洱海TP、TN、COD_Mn、chla、TLI(∑)总体呈上升趋势,氮、磷是主要污染因子;②洱海chla、TN、TP、COD_Mn与TLI(∑)呈显著正相关;③洱海综合营养状态指数呈上升趋势,富营养化有加重的趋势,必须采取针对性保护措施,遏制富营养化发展。

Abstract: In order to examine the eutrophication status of Erhai Lake, through on-site investigation and data collection,the correlation between total nitrogen (TN), total phosphorus (TP), permanganate index (COD_Mn), total transparency (SD), chlorophyll a (chla) and total nutrient state index (TLI) and the influencing factors of eutrophication in Erhai Lake were studied. The results showed that TP, TN, COD_Mn, chla, TLI (∑) were increasing from 2008 to 2017. N and P were the main pollution factors. Chla, TN, TP, COD_Mn were positively correlated with TLI (∑). The comprehensive nutritional state index of Erhai Lake was growing. The trend of eutrophication was getting worse. Therefore, countermeasures must be taken to curb the worse of eutrophication.