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Wet period of peaceful water in the dry season of 2005 , investigated two different types of karst reservoir : of Hongfeng Lake reservoir ( tributary gully type ) and Wujiangdu reservoir ( main stream canyon type ) , library phytoplankton species in the region , community structure , number , over the same period to detect physical and chemical indicators of temperature, pH , dissolved oxygen , total nitrogen , total phosphorus , and the results show that : two phytoplankton species composition there are some differences , different community structure ; red maple Lake Reservoir Total phytoplankton 121 (including varieties and forms ) , part of the seven classes , 18 orders , 32 families and 63 genera , Chlorophyta and Cyanophyta species , abundance and biomass mostly dry , flat, Feng at one time, are blue-green algae - green algae communities . The Wujiangdu reservoir were 98 kinds of phytoplankton (including varieties and forms ) , part of 6 , 8 classes, 14 orders , 27 families and 53 genera , dry season, the water level period Chlorophyta and Bacillariophyta species , quantity and biomass accounted advantage phytoplankton community types green algae - diatoms type wet period by Chlorophyta and Cyanophyta species number and biomass majority community as cyanobacteria - green algae . Every one reservoir in different periods phytoplankton there are some differences , the type and quantity is different depending on the season and showed the differences , the Hongfeng Lake reservoir dry season water bloom Aphanizomenon algae (Aphanizomenon flos-aquae Ralf.) As the dominant species , normal water The blue-green algae still accounts for the dominant diatom species and the number of rising to become sub- dominant populations , wet period by Microcystis aeruginosa ( of Microcystis aeruginosa Kutz . ) and their small variants (Microcystis aeruginosa var.minor HWLiang.) The dominant species . Wujiangdu reservoir empty wet period cruentum (Eudorina elegans Ehr.) , And the angle of dinoflagellates ( the Ceratium ( Mull. ) Schr hiruninella . ) Is the dominant species , dry season, flat water Needle rod algae ( Synedra acus Kutz . ), Medium-sized brittle rod algae such as diatoms (Fragilaria intermedia Grun.) as the dominant species , and these differences are mainly dependent on the hydrodynamic characteristics of the reservoir and the level of nutrients . Wujiangdu reservoir as River Gorge Reservoir has obvious characteristics of the river and tributaries gully type reservoir catchment wide river recharge and reservoir storage volume is large, strong water flow , self-purification ability material recycling water fast , planktonic
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