江西省中小型湖泊水体营养状态评价及其驱动因子研究

Study on Trophic State Assessment and Its Driving Factors of Small and Medium Lakes in Jiangxi Province

利用2010年江西省25个中小型湖泊的监测数据,通过综合营养状态指数法评价湖泊水体营养状态,采用主成分分析法探讨湖泊水体富营养化的驱动因子。结果表明,湖泊的水体营养状态均达中度营养,其中8个湖泊已达到轻度富营养化。导致湖泊水体富营养化的驱动因子主要为四类:影响程度最大的因子为pH、TN和NO3-N等指标;其次为TP、DP等含磷营养盐指标;再次为水温和水深等自然特征指标;影响最小的为Chl-a和CODMn等生物和有机物特性指标。

Monitoring data of water quality for 25 small and medium lakes in Jiangxi Province in 2010 were collected. The trophic state of these lakes was evaluated by comprehensive eutrophication state index method, and the driving factors of the eutrophic lakes studied applying the principal component analysis （PCA）. The results demonstrated that the trophic states of all the lakes were in mesotropher, 8 among which were lightly eutrophicated. The driving factors of the water eutrophication could be divided into 4 groups. The pH, total nitrogen and nitrate were the most important indexes for water eutrophication in Jiangxi Province;the phosphorus-containing nutrient indexes such as TP and DP belonged to the second group; the natural characteristic indexes such as water depth and temperature were in the third group; and the biological and organic compounds indexes such as Chl-a and CODMn contributed the lest for water eutrophication in the studied lakes.