EVATUATION OF PRIMARY PRODUCTIVITY IN STREAM BY TWO DIMENSIONAL FLUORESCENCE MEASUREMENT METHOD

采用脉冲幅度调制（PAM）方法对藻类光合作用活性进行了评价。在本研究中，采用了河床周生植物初级生产力的估算方法。使用Handy Fluor Cam获得水平二维分布。因此，绿藻和丝状藻的最小荧光产率Fo与生物量之间存在相关性。最大荧光产率Fm与硅藻有较高的相关性。在野外直接测量时，必须有良好的光照条件和充足的藻类生物量。

Pulse Amplitude Modulation(PAM)method is used to evaluate photosynthesis activities for algae. In this study, estimation of primary productivity of stream bed periphyton was applied. Handy Fluor Cam was used to obtain horizontally two dimensional distributions. As a result, there is correlation between the minimum fluorescence yield Fo and the biomass for green algae and filamentous algae. There is relatively high correlation between the maximum fluorescence yield Fm and diatom. For direct measurement in field, the dark condition and enough amount of algal biomass are necessary.