CAJ | 학술논문

2007年4月23～24日对西江两个天然广东鲂产卵场--青皮塘和罗旁的浮游植物种类组成及分布进行了调查,共发现浮游植物98种(含变种、变型和未知藻种),其中硅藻门(Baeillariophyta)70种,占总种数的71.43%;绿藻门(Chlorophyta)12属20种,占总种数的20.41%;蓝藻门(Cyanophyta)3属4种;裸藻门(Euglenophyta)2属2种;隐藻门(Cryptophym)和金藻门(Chrysophyta)均为1种.两产卵场中,硅藻在浮游植物总密度中所占百分比均大于70%.青皮塘的浮游植物种类数和种群密度均呈自上游至下游增加的趋势;罗旁则相反.变异直链藻(M. varians)是两个产卵场共有的绝对优势种,根据该种的污染指示性作用,其在两个产卵场的分布差异在一定程度上或一个侧面反映出.罗旁的水质环境略优于青皮塘.
2007년4월23～24일대서강량개천연엄동방산란장--청피당화라방적부유식물충류조성급분포진행료조사,공발현부유식물98충(함변충、변형화미지조충),기중규조문(Baeillariophyta)70충,점총충수적71.43%;록조문(Chlorophyta)12속20충,점총충수적20.41%;람조문(Cyanophyta)3속4충;라조문(Euglenophyta)2속2충;은조문(Cryptophym)화금조문(Chrysophyta)균위1충.량산란장중,규조재부유식물총밀도중소점백분비균대우70%.청피당적부유식물충류수화충군밀도균정자상유지하유증가적추세;라방칙상반.변이직련조(M. varians)시량개산란장공유적절대우세충,근거해충적오염지시성작용,기재량개산란장적분포차이재일정정도상혹일개측면반영출.라방적수질배경략우우청피당.
We studied the community structure and distribution of phytoplankton in two Megalobrama hoffmanni spawning ground(Qingpitang and Luopang) of Xijiang River.Total 98 species were identified,including 70 diatoms(contributing 71.43% to total),20 green algae(contributing 20.41%to total);other species belong to Cyanophyta,Euglenophyta,Cryptophyta and Chrysophyta respectively.The phytoplankton density of Qingpitang and Luopang were 3.04×104cells/dm3 and 2.71 ×104cells/dm3 respectively,and the contribution of diatom to total were both higher than 70%,which provided abundant food for Megalobrama hoffmanni and its juvenile fish.The species richness and population density of phytoplankton in Qingpitang increased from upstream to downstream,and the condition of Luopang was opposite,which maybe caused by different geographic position of two spawning grounds.Melosira variaa8 was the dominant species of both two spawning grounds,and its different distribution at two spawning grounds indicated that the water environment of Luopang WaS better than Qingpitang.