CAJ | 학술논문

采集夏季崇明岛中心湖原水，在环形有机玻璃水槽开展了不同流速对浮游藻类生长和种群变化影响的研究。相对于静止水槽，实验前期不同的流速条件均对浮游藻类的生长产生了一定的抑制作用，实验后期浮游藻类叶绿素 a含量均稳定在一定水平，且流动水槽中叶绿素a含量略大于静止水槽，这可能与静止围隔中出现大量枝角类浮游动物有关，而流动条件则抑制了浮游动物的生长，减轻了对浮游藻类的捕食压力。水体流动导致了浮游藻类种群的变化，蓝藻的迅速消失、绿藻和硅藻形成生长优势是主要特征，表明持续的流动条件是导致浮游植物种属减少和群落结构变化的直接原因。该研究可为调水引流在河道、湖泊和水库中的富营养化控制和水华防治提供基础依据。
채집하계숭명도중심호원수，재배형유궤파리수조개전료불동류속대부유조류생장화충군변화영향적연구。상대우정지수조，실험전기불동적류속조건균대부유조류적생장산생료일정적억제작용，실험후기부유조류협록소 a함량균은정재일정수평，차류동수조중협록소a함량략대우정지수조，저가능여정지위격중출현대량지각류부유동물유관，이류동조건칙억제료부유동물적생장，감경료대부유조류적포식압력。수체류동도치료부유조류충군적변화，람조적신속소실、록조화규조형성생장우세시주요특정，표명지속적류동조건시도치부유식물충속감소화군락결구변화적직접원인。해연구가위조수인류재하도、호박화수고중적부영양화공제화수화방치제공기출의거。
An experimental simulation study was conducted using surface water from Zhongxinhu Lake of Chongming Island in oval plexiglass enclosures.The object of the study was to investigate the effect of flow velocity on phytoplankton growth and composition dynamics.Both flow conditions had inhibition effects on phytoplankton biomass in early experiment compared with the still enclo-sure and in late experiment the phytoplankton biomass stabilized in a certain level in all enclosures .Moreover, a higher Chl.a con-centration was found in both flow enclosures in the late experiment , implying that numerous Cladocera zooplankton occurred in the still enclosure might be the reason that in flow conditions the turbulent flows inhibited the growth of zooplankton and reduced the predation pressure of phytoplankton.The turbulent flow also resulted in the changes of phytoplankton composition with the feature of the rapid disappearance of blue-green algae and the domination of green algae and diatoms .The result indicated that the continu-ous flow may directly caused the reducing species and composition dynamics of phytoplankton .The study can provide basis of the application of water division in eutrophication management and algae bloom prevention of rivers , lakes and reservoirs.