CAJ | 학술논문

根据2007年底至2008年初珠江河门咸潮入侵期间大潮和小潮的两次调杳资料,对浮游植物的种类组成、种数和细胞密度的分布等群落特征进行了分析,并探讨环境因素对浮游植物群落的影响.共鉴定浮游植物76种,包括38种硅藻、18种绿藻、14种甲藻、4种蓝藻和2种裸藻.浮游植物种数分布有明显的空间变化,一般从河口上段至下段种数减少;大潮时浮游植物的种数低于小潮时,并且各水层之间浮游植物种数分布不均匀.优势种以淡水硅藻为主,如颗粒直链藻Melosira granulata、颗粒直链藻最窄变种Melosira granulata v.angustissima、小环藻Cyclotella sp.和海链藻Thalassiosira sp.等;河口上段的站优势种突出,密度分布不均匀,均匀度值比较低.大潮和小潮期间浮游植物细胞密度的平均值分别为53.80×10~4个·L~(-1)和62.21×10~4个·L~(-1),变化范围为(1.48-290.41)×10~4个·L~(-1)和(1.52-283.62)×10~4个·L~(-1);二者的平面分布趋势基本相同,由河口上段至下段呈递减的格局,硅藻类的细胞密度占明显优势.浮游植物的种类组成、种数和细胞密度的分布受盐度、营养盐等环境因子的影响,并且具有明显的潮周期性.
근거2007년저지2008년초주강하문함조입침기간대조화소조적량차조묘자료,대부유식물적충류조성、충수화세포밀도적분포등군락특정진행료분석,병탐토배경인소대부유식물군락적영향.공감정부유식물76충,포괄38충규조、18충록조、14충갑조、4충람조화2충라조.부유식물충수분포유명현적공간변화,일반종하구상단지하단충수감소;대조시부유식물적충수저우소조시,병차각수층지간부유식물충수분포불균균.우세충이담수규조위주,여과립직련조Melosira granulata、과립직련조최착변충Melosira granulata v.angustissima、소배조Cyclotella sp.화해련조Thalassiosira sp.등;하구상단적참우세충돌출,밀도분포불균균,균균도치비교저.대조화소조기간부유식물세포밀도적평균치분별위53.80×10~4개·L~(-1)화62.21×10~4개·L~(-1),변화범위위(1.48-290.41)×10~4개·L~(-1)화(1.52-283.62)×10~4개·L~(-1);이자적평면분포추세기본상동,유하구상단지하단정체감적격국,규조류적세포밀도점명현우세.부유식물적충류조성、충수화세포밀도적분포수염도、영양염등배경인자적영향,병차구유명현적조주기성.
The authors analyzed species composition,distribution of species richness and phytoplankton density based on the data collected from two cruises carried out during saline water intrusion period from the end of 2007 to the beginning of 2008 at both spring and neap tides in the Pearl River Estuary.In addition,influence of environmental factors on phytoplankton community was discussed.Seventy-six species in total were identified,including 38 diatoms,18 green algae,14 dinoflagellates,4 cyanobacteria and 2 euglenas.In general,the distribution of species richness decreased from inner section to outer section of the Pearl River Estuary.The species richness of phytoplankton was higher at neap tide than at spring tide,and it distributed unevenly among different water layers.The dominant species were mainly freshwater diatoms,such as Melosira granulate,Melosira granulata v.angustissima,Cyclotella sp.and Thalassiosira sp.The dominant species were very outstanding in the inner section of the Pearl River Estuary with the characteristics of uneven density distribution and low evenness index value.The mean phytoplankton densities at spring and neap tides were 53.80×10~4 and 62.21×10~4 ind·L~(-1),and the ranges of cell density were from 1.48×10~4 to 290.41×10~4 and from 1.52×10~4 to 283.62×10~4 ind·L~(-1),respectively.Phytoplankton density decreased from the inner to outer sections of the Pearl River Estuary,and the density of diatom was the highest among different groups during both spring and neap tides.The community of phytoplankton presented clear tidal periodicity.Environmental factors such as salinity and nutrients played an important role in the composition and distribution of phytoplankton during saline water intrusion period in the Pearl River Estuary.