摘要
2009年5月至2012年4月对大通湖水体中的总氮、总磷、浮游生物进行了调查和分析。数据显示:大通湖水体已中度富营养化。三年内,总氮富营养化评价指数平均升高了15,总磷富营养化评价指数平均升高了13,浮游植物的Sannon-Weiner指数平均下降了0.08,Margalef指数平均下降了1.65,Simpson’s指数平均下降了0.09,McNaughton指数平均上升了0.01,Pielou指数平均上升了0.05。一年中,富营养化最严重的时期是8、9月份,最轻的是1月份。大量施肥和不科学的放养模式是导致大通湖水体富营养化迅速加重、蓝藻比例逐年增大和浮游生物多样性下降的主要原因,螺、蚌、蚬过多是导致大通湖水域生产力下降的重要原因之一。
Total nitrogen, total phosphorus and plankton of Datong Lake were studied from March 2009 to April 2012. The results showed that Datong Lake was in mesoeutrophic state. Mean evaluation index of available nitrogen and available phosphorus for eutrophication increased for 15 and 13, respectively. Sannon-Weiner indexes and Margalef indexes of phytoplankton decreased for 0.08 and 1.65, respectively. Simpson＇s indexes, McNaughton indexes and Pielou indexes of phytoplankton increased for 0.09, 0.01 and 0.05 respectively. The content of nutrients reached the highest in August and September, the lowest in January. The results indicated that intensive fertilization and unscientific stocking models were the main reasons for the eutrophication, annual increasing of Cyanobacteria and decreasing of biodiversity indexes and mollusks was one of the reasons for decreasing of water production in Datong Lake.
出处
《生态科学》
CSCD
北大核心
2014年第3期586-593,共8页
Ecological Science
作者简介
钟诗群（1966—），男，安徽庐江人，副教授，主要研究方向为大水体渔业开发和水环境生态，E-mail：zhongshiqun7532@sina．com
