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中文摘要：
为探讨影响典型湖泊边缘区藻类生长的主要水质因子,于2011年7月测定了蚌湖的叶绿素a含量,并对其分布特征及相关性进行分析。结果表明,叶绿素a（Chl.a）浓度的变化范围为0.55～1.56mg/m3,表现出一定的空间差异性,以入湖口处和湖尾区最大。总氮（TN）为0.699～2.596mg/L,以湖尾区最高;总磷（TP）浓度整体较低,最大值仅为0.0318mg/L;N/P浓度比均大于30,表明蚌湖为磷限制性湖泊。根据修正的卡尔森营养状态指数,丰水期蚌湖均处于贫-中营养水平,其中湖尾区条件最适宜藻类繁殖。由相关性分析结果可知,TN、TP、pH、COD和NO-3-N为藻类生长的主要影响因子;其中,Chl.a含量与COD呈显著正相关,一定浓度范围内的COD增长会促进藻类生长繁殖;不同于国内大多数淡水湖泊,Chl.a含量与pH值呈显著负相关,主要原因是蚌湖水体碱度较高,大部分区域pH值超过了藻类生长的最适范围。
英文摘要：
In order to discuss the main water quality factors that can influence the algae growth in typical lake fringe area, this paper had determined the content of chlorophyll a, and analyzed its distribution characteristics and correlation in July, 2011. The results showed that the Chl.a concentration varied from 0.55 to 1.56 mg/m3 and appeared obvious spatial difference from estuary to lake tail,of which the concentration was least in the estuary and maximum in the lake tail. Concentration of TN ranged from 0.699 to 2.596 mg/L, of which the maximum occurred in the lake tail. Concentrations of TP in the whole lake area were low, with the highest value of 0.0318 mg/L. Furthermore, all the N/P concentration ratios exceeded 30, indicating that phosphorus was the limiting factor in Banghu Lake. According to the modified Carlson Trophic State Index, the Banghu Lake was in oligotrophic to mesotrophic status in wet season, and the conditions in lake tail would be appropriate for algae breeding. By the correlation analysis result, TN, TP, pH, COD and NO-3-N were the major influencing factors for algae growth. The correlation between COD and Chl.a content was positive, and the COD concentration, increasing in certain range, would promote algae growth. Being different from most fresh water lakes in domestic, the correlation between Chl.a and pH was significantly negative, of which main reason was the higher water alkalinity in Banghu Lake, and the pH value in most area exceeded the optimum range for algae growth.
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