摘要
根据2007年4-7月春夏之交水华高发期间,三峡水库小江回水区浮游植物群落结构组成和交替变化的跟踪观测结果,对水华的发生和种群变动特点进行了初步分析。结果表明,这一时期浮游植物主要由绿、硅、蓝藻组成,绿藻在细胞密度和物种种类上都占优势。浮游植物优势种在研究期间存在明显的交替现象,水温升高和营养条件的改变是引起物种交替可能的重要原因。浮游植物细胞密度呈明显的先增长后减少趋势,各断面的平均细胞密度从4月初的4.51×105/L升高到5月中旬的106.53×105/L,至7月底回落到14.43×105/L。其中,由于蓝藻水华的暴发,细胞密度的最高峰出现在5月中旬的黄石断面,其值为2.97×107/L。在水华暴发前后,蓝藻中的水华鱼腥藻和水华束丝藻明显取代了绿藻成为优势种。
Based on the sampling data of phytoplankton in the backwater area of the Xiaojiang River in the Three Gorges Reservoir from April to July in 2007, the ecological characteristics of phytoplankton community and species succession are studied. The results show that Chlorophta, Bacillariophyta and Cyanophyta are the main taxa in this area. Chlorophta is dominant in both cell abundance and species variety. An obvious succession is found, as mailnly due to the increase of temperature and the change of nutrient. The average cell abundance of phytoplankton of each site increases from 4.51×10^5 /L in April to 106.53×10^5/L in the mid of May, then back to 14.43×10^5/L in the end of July. The peak of cell abundance（2.97×10^7/L） is reached in the mid of May due to the occurrence of the blooms. During the blooms, Anabaena flos-aquae and Aphanizomenon flos-aquae of Cyanophyta become the dominant taxa instead of Chlorophta.
出处
《科技导报》
CAS
CSCD
2008年第17期70-75,共6页
Science & Technology Review
基金
中国科学院西部行动计划项目(KZCX2-XB2-07-02)
关键词
三峡水库
小江回水区
水华
浮游植物
群落交替
Three Gorges Reservoir
backwater area of Xiaojiang river
blooms
succession
community
