| 周期性的温度扰动对藻类群落结构演替的影响 |
| 摘要点击 1494 全文点击 909 投稿时间：2015-09-28 修订日期：2016-01-15 |
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| 中文关键词 温度扰动 周期性变化 藻类群落结构 生态功能组 演替特征 |
| 英文关键词 temperature disturbance periodic variation structure of algae community ecological functional groups succession characteristics |
| 作者 | 单位 | E-mail | | 贡丹丹 | 三峡大学水利与环境学院, 三峡库区生态环境教育部工程研究中心, 宜昌 443002
湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068 | ctgugd@163.com | | 刘德富 | 三峡大学水利与环境学院, 三峡库区生态环境教育部工程研究中心, 宜昌 443002
湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068 | dfliu@189.cn | | 张佳磊 | 湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068 | | | 杨正健 | 湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068 | | | 朱晓明 | 三峡大学科技学院, 宜昌 443002 | | | 谭纤茹 | 湖北工业大学土木建筑与环境学院, 河湖生态修复与藻类利用湖北省重点实验室, 武汉 430068 | |
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| 中文摘要 |
| 为了研究水库生境扰动对藻类水华的作用机制,以中度扰动理论为基础,结合藻类群落生境选择学说和藻类生态功能组,开展了不同温度扰动周期、相同扰动幅度下藻类多样性变化特性和群落结构演替特征的室内控制实验.结果表明:①适度的扰动会促进藻类的生长且增加其多样性.中度扰动组Δ22℃/48 h藻类生物量最大,但多样性最高,不存在绝对占优藻种,而高频次扰动组Δ22℃/24 h生物多样性较小,但可降低藻类生物量. ②温度的周期性变化对浮游藻类群落的演替有明显的影响,优势种也呈现一定的差异性.藻类优势功能组演替基本规律为:X1(小球藻)→J(栅藻)→S1(席藻)或X2(衣藻),群落结构呈现出C/CR型藻类先行占优向R型演替的趋势.高温扰动频繁时,R型藻类(S1)明显占优;无扰动或低扰动时,群落结构组成特点以C/R策略为主.适度的扰动组Δ22℃/48 h形成了多种生长策略的藻类共存的格局,且耐受高温胁迫的S策略藻类(L0)开始出现. |
| 英文摘要 |
| In order to study the mechanism of the habitat disturbance of reservoir on algae blooms, some interior control experiments about the feature of algal diversity and the succession of community structure under different temperature disturbance cycle but the same amplitude condition were conducted, based on the intermediate disturbance hypothesis and combined with algal community habitat selection theory and ecological functional groups of algae. The results showed that:① the intermediate disturbance would accelerate the growth of algae and increase their diversity. Under the gradient of the intermediate disturbance group Δ22℃/48h, the diversity of phytoplankton was the highest, and the biomass reached the maximum, however, without absolute dominant algal species. While in the high frequency disturbance group Δ22℃/24h the biodiversity was relatively lower, but the algae biomass was reduced. ② the periodical change of temperature had obvious influence on the succession of the phytoplankton community, and the dominant species also presented certain differences. The succession of the algal advantageous function group followed the basic rule of X1(Chlorella)→J(Scenedesmus)→S1(Phormidium) or X2 (Chlamydomonas), and the community structure also presented a trend that the C/CR type algae took advantage and the superiority was gradually replaced by R type algae. When the high temperature disturbance was frequent, the R type algae (S1) was distinctly ascendant. During the experiment, the community structure was given priority to the C/R strategy algae with no or low disturbance. However, the coexistence of algae with different growth strategies was evident in group Δ22℃/48h. Meanwhile, the S strategy algae (L0) resistant to high temperature stress began to emerge. |
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