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.
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.
出处
《湖泊科学》
EI
CAS
CSCD
北大核心
2010年第6期935-940,共6页
Journal of Lake Sciences
基金
国家水体污染控制与治理科技重大专项项目(2009ZX07101-013-03)
中国科学院知识创新工程重要方向性项目(KZCX2-YW-419)
国家自然科学基金重点项目(40730529)资助
关键词
快速光曲线
叶绿素荧光
附着生物
沉水植物
太湖
马来眼子菜
穗花狐尾藻
Rapid light curve
chlorophyll fluorescence
epiphyte
submerged macrophyte
Lake Taihu
Potamogeton malaianus
Myriophyllum spicatum
