摘要
于2000年丰水期和枯水期调查分析了鹤地水库的营养状态及浮游生物特征。结果表明:鹤地水库营养盐含量很高,综合营养状态指数评价为中一富营养化水平。浮游植物丰水期和枯水期的细胞密度分别为1 950.5～3 509.7×10~4 cells·L^(-1)和130.5～231.3×10~4 cells·L^(-1),蓝藻中的微囊藻和席藻数量占细胞总数的83%以上。在丰水期和枯水期,浮游植物的群落结构均为蓝藻-绿藻-硅藻型,优势种为微囊藻和席藻。次优势种由丰水期蓝藻中的粘球藻,颤藻,绿藻中的衣藻,和硅藻中的颗粒直链藻等转变为枯水期的蓝藻门的水华束丝藻和硅藻门的颗粒直链藻等富营养化指示种。鹤地水库的浮游动物种类不多,但数量很高。丰水期的无节幼体和桡足幼体数量很多,但从优势种类来说,轮虫以曲腿龟甲轮虫,纵长异尾轮虫,剪形臂尾轮虫为主,枝角类的优势种为长额象鼻蚤;枯水期时无节幼体的数量最多,桡足幼体数量急剧下降,优势种类则转变为枝角类的长额象鼻蚤和桡足类的广布中剑水蚤。两个水期浮游动物的优势种类均是以耐污种和广布性种类为主。
The trophic state and plankton distribution were investigated in Hedi reservoir in 2000.The TLI(trophic level index) showed that the reservoir was meso-eutrophic.The abundance of phytoptankton in flood season and dry season were 1 950.5～3 509.7 ×10~4 cells·L^(-1)and 130.5～231.3×10~4 cells·L^(-1)respectively,and the proportion of Microcystis sp.and Phormidium sp.(Cyanophyta) in phytoplankton abundance were over 83%.In both flood season and dry season,the phytoplankton community structure is Cyanophyta-Chlorophyta-Bacillariophyta.The dominant species are Microcystis sp.and Phormidium sp.in the two seasons.The sub-dominant species were Gloeocapsa sp.and Oscillatoria sp.(Cyanophyta),Chlamydomonas sp.(Chlorophyta),and Melosira granulata(Bacillariophyta)in the flood season.However,the sub-dominant species were Aphanizomenon flos-aquae(Cyanophyta) and Melosira granulata(Bacillariophyta)in dry season.All above these species are eutrophic indicators.The species of zooplankton in the Hedi Reservoir were rare but the abundance very high.In the flood season,the Nauplii and Copepodite of Copepoda were abundant in the reservoir.The predominated species were Keratella valga,Trichocerca elongata,Brachionusforficula(Rotifer)and Bosmina longirostris(Cladocera)in the flood season.In the dry season,however,the abundance of Nauplii were highest in zooplankton but the abundance of Copepodite descended rapidly.The predominated species were Bosmina longirostris(Cladocera), Mesocyclops leuckarti(Copepoda)in dry season.The predominated groups in the two seasons were those species with a wide-ecological spectrum and/or were all organic matter-resistant.
出处
《生态科学》
CSCD
2002年第3期208-212,共5页
Ecological Science
基金
广东省科技攻关(2KM06103S)
教育部骨干教师基金
广东省水利厅水库重点项目等资助
