生态环境学报2017，Vol.26Issue(11)：1961-1968,8.DOI:10.16258/j.cnki.1674-5906.2017.11.017
扰动强度对太湖水华微囊藻群体大小的影响
Effects of Different Disturbance Intensity on the Colony Size of Microcystis flos-aquaein Lake Taihu
摘要
Abstract
Disturbance induced by wind-wave is one of the important environmental factors that affect the lake ecosystem. To understand the effect of disturbance intensity on the colony size of M. flos-aquae in lakes, a simulation experiment in lab was conducted to measure the effects of different disturbance intensities (0, 50, 100, 200 and 400 r·min-1) on the colony size of M. flos-aquaein Lake Taihu. The results showed that the colony size of M. flos-aquaeincreased and then decreased with the increasing of disturbance intensity under which the treatment groups simulated the disturbance induced by wind-wave for 24 h. The colony sizes of M. flos-aquaein the disturbance intensities 50 r·min-1 and 100 r·min-1 increased rapidly from 10.72μm and 10.58μm to 17.92μm and 39.50μm, respectively, which were significantly larger than that in the control groups (P=0.006, 0.000). However, There was no significant difference between the colony sizes of M. flos-aquae in the disturbance intensities 200 r·min-1 and 400 r·min-1 and that in the control groups (P=0.161, 0.727). The total extracellular polysaccharide content in the disturbance intensities 100 and 200 r·min-1 was significantly higher than that in the control groups at the end of the disturbance (P=0.001, 0.006), but there was no significant difference between the total extracellular polysaccharide content in disturbance intensities 50 r·min-1 and 400 r·min-1 and that in the control groups (P=0.180, 0.089). The results of study suggested that appropriate intensity of disturbance induced by wind-wave can significantly enlarge the colony size of Microcystis during short time, but too strong intensity of disturbance can not significantly improve the colony size of M. flos-aquae during short time, which is valuable for people to understand the breakout mechanism of Microcystis blooms in Lake Taihu.关键词
扰动/水华微囊藻/群体大小/胞外多糖Key words
disturbance/Microcystis flos-aquae/colony size/extracellular polysaccharide分类
资源环境引用本文复制引用
刘玉,杨桂军,韩丽华,秦伯强,钟春妮,杨宏伟..扰动强度对太湖水华微囊藻群体大小的影响[J].生态环境学报,2017,26(11):1961-1968,8.基金项目
国家水体污染控制与治理科技重大专项项目(2012ZX07503-002 （）
2012ZX07101-013-03) （）
国家自然科学基金重点项目(41230744) （41230744）
