生态系统结构对太湖有机聚集体理化性质的影响

Effects of Ecosystem Structure on the Organic Aggregates Physical and Chemical Parameters of Lake Taihu

2007年1~12月对太湖4个不同生态类型湖区水体中有机聚集体（organic aggregates,OA）的丰度、有机质含量和营养盐（N、P）含量及其它水环境因子进行了同步监测.结果表明,①OA是太湖水体中营养盐的一个重要来源,其N、P含量分别占水体中TN、TP的16.5%及43.3%;②水体中OA的丰度与水体的富营养化程度密切相关,随着水体富营养化水平的提高和浮游植物生物量的增加,OA丰度及其中有机质的含量也呈现逐渐上升的趋势;③风浪扰动对太湖水体中OA的理化性质影响较大.OA作为营养盐的一个重要载体,可能是浅水湖泊营养盐循环中的一个关键点.

The abundance, organic matter content and chemical composition of organic aggregation （OA） were monitored in Lake Taihu in different ecotype sites from January to December in 2007, and other water physical and chemical parameters were concomitantly monitored. The OA abundance was increasing along regional and P-enrichment gradients, and there were significant differences in OA characteristic in different ecotypes. Moreover, wind is one important factor that contributes to OA characteristic in Lake Taihu. OA maybe one potential important nutrient source in lake water for its high enrichment factors of nutrition ： the concentrations of P and N in the OA were much higher than that of in the water; more than one third （43.3%） of TP could be attributed to the OA-P, and that number of OA-N is 16.5%.