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中文摘要：
在水草生长比较旺盛的季节（7-8月）,以水草较丰富的贡湖湾作为采样区域,野外采样结合室内分析研究太湖常见的两种沉水植物马来眼子菜（Potamogeton malaianus）及穗花狐尾藻（Myriophyllum spicatum）叶上的附着生物的生物量;利用脉冲振幅调制叶绿素荧光仪研究去除附着生物前后两种沉水植物的光合作用的变化.结果表明,马来眼子菜和穗花狐尾藻两种沉水植物上的附着生物的现存量存在显著的差异,附着生物群落中自养生物与异养生物的比值没有显著差异;两种沉水植物在去除附着生物前后的光合参数有显著的变化,光合作用效率、半饱和光强、最大电子传递速率增加.这表明附着生物降低了沉水植物光合作用.
英文摘要：
In the submerged macrophyte-dominated Gonghu Bay of Lake Taihu,this paper studied the epiphyte biomass and its effect on the rapid light curves （RLC） of Potamogeton malaianus and Myriophyllum spicatum during the vigorous growth season （from July to August） of submerged macrophyte by using a submersible and pulse-amplitude modulated fluorometer （Diving-PAM）.The results showed that the epiphyte biomass attached to leaves of M.spicatum was significantly higher than that attached to leaves of P.malaianus,but the ratio of heterotrophic biomass to autotrophic biomass in epiphytic communities attached P.malaianus was not different from that attached M.spicatum.Photosynthetic fluorescence characteristics,such as the photosynthetic coefficients,the half saturation point of light intensity and maximal relative electron transport rate of P.malaianus and M.spicatum with epiphyte were lower than those of the same plant species without epiphyte.The results indicated that epiphyte decreased photosynthesis of submerged plants.
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