摘要
根据2010年1月蠡湖的浮游植物与营养盐的同步监测资料,利用GIS技术,对蠡湖冬季浮游植物的种类组成、优势种、丰度及其空间分布和多样性等进行了分析。结果表明:浮游植物有7门27属,绿藻门种类最多共12种,占总种数的44.44%,其次是硅藻门和隐藻门,分别为7种和3种,占总种数的25.93%和11.11%;主要优势种为啮蚀隐藻(Cryptomonas erosa)、卵形隐藻(C.ovata)、尖尾蓝隐藻(Chroomonas acuta)和微囊藻(Microcystis aeruginisa);浮游植物平均丰度为1099.6×104ind·L-1,隐藻丰度分布趋势决定了浮游植物丰度的分布趋势;宝界桥至西堤湖区(B区)是浮游植物较为密集区,西堤以北湖区(A区)为浮游植物稀疏区;浮游植物群落Shannon物种多样性指数平均值为1.1,Pielou均匀度指数平均值为0.31。与2007年相比,2010年冬季浮游植物数量大幅增加,且主要优势种群也发生了较大的变化,由以绿藻为主向以隐藻为主演替。分析表明,磷是蠡湖冬季浮游植物生长的限制性因素,氮磷比的变化是导致冬季浮游植物数量增加的主要原因。
Based on the investigation of phytoplankton and water body nutrient concentrations in the Lihu Bay of Taihu Lake in January 2010 and by using GIS technique, this paper analyzed the species composition, dominant species, abundance, spatial distribution, and diversity of the phytoplankton in the Bay in winter. A total of 27 genera of 7 phylums were identified, among which, Chlorophyta （12 species）, Bacillariophyta （7 species）, and Cryptomonas （3 species） occupied 44.44%, 25.93%, and 11.11% of the total, respectively. The dominant species were Cryptomonas erosa, C. ovata, Chroomonas acuta,and Microcystis aeruginisa. The Shannon diversity index （H） was 1.1, and the Pielou evenness （J） was 0.34 on average. The phytoplankton had a density of 1099.6×10^4 ind·L^-1, in which, Cryptomonas dominated the spatial distribution of the phytoplankton. The highest phytoplankton abundance was found in the zone covering from Baojie Bridge to Xidi Lake, and the lowest value was in the north of the Xidi Lake. As compared with the winter in 2007, the phytoplankton abundance in winter 2010 increased remarkably, and the dominant species shifted from Chlorophyta to Cryptomonas. Further analyses revealed that water body phosphorus was the limiting factor of phytoplankton growth, and the variation of water body nitrogen/phosphorus ratio was the main reason for the increase of the phytoplankton in winter.
出处
《生态学杂志》
CAS
CSCD
北大核心
2012年第1期1-7,共7页
Chinese Journal of Ecology
基金
水体污染控制与治理科技重大专项(2009ZX07101-013)资助
关键词
蠡湖
浮游植物
种类组成
氮
磷
Lihu Bay
phytoplankton
species composition
nitrogen
phosphorus.
