太湖和滇池表层水体水质与水华蓝藻生物质生化性状的关系

RELATIONSHIP BETWEEN WATER QUALITY OF SURFACE WATER AND BIOCHEMICAL CHARACTERS OF CYANOBACTERIAL BIOMASS IN THE TAIHU LAKE AND THE DIANCHI LAKE

根据2010年5～8月对滇池海埂和太湖竺山湖监测点的逐月监测结果,对同时期不同地域湖泊水体的污染状况进行比较研究,并评估了表层水体水质与水华蓝藻生化性状指标之间的相关性。结果表明:滇池水体的富营养化程度较太湖高,从取样月份之间差异来看,滇池表层水体水质指标均呈现先升高后降低再升高趋势,以6月份为最高,而太湖则呈逐月升高趋势。滇池蓝藻生物质中凯式氮、全磷和总养分(N+P2O5+K2O)含量均与太湖相当,但是滇池蓝藻C/N较太湖高,且除As、Cd元素超标外,各样品中其余重金属元素的含量均低于有机肥料行业标准(NY525-2011)。通过进一步的相关性分析表明,无论滇池还是太湖水域,其水华蓝藻中的Pb和Cr之间表现出明显的同源性;此外,表层水体NH4+-N水平可以作为水体富营养化程度的快速指示指标。

Based to the monthly monitoring data of monitoring points in the Dianchi lake and the Taihu lake, analysis of pollutions with lake water at the same time in different geographical situation was comparatively studied,and the correlation between water quality of surface water and biochemical characters of cyanobacterial biomass was assessed. The results revealed that the degree of eutrophication in the Dianchi Lake was higher than that of the Taihu Lake during monitoring. Water quality index in the Dianchi lake showed increase-reduce-increase,and was highest in June. While the water quality index in the Taihu lake showed a rising trend monthly. The content of kjeldahl nitrogen,total phosphorous and the total nutrients （N＋P2O5 ＋ K2O） of the Dianchi Lake cyanobacteria biomass was same as the Taihu Lake, but the C/N was higher than the Taihu Lake. The content of the heavy metal elements in the various samples levels were lower than the organic fertilizer industry standards （NY525-2011） except for As and Cd. Correlation analysis showed that lead and chromium of cyanobacteria biomass had significant homology. In addition,the content of ammonium nitrogen in surface water could be used as the extent indicator of eutrophication.