| 类群划分方法对南亚热带水库夏季浮游植物群落与环境响应关系的影响 |
| 摘要点击 1305 全文点击 726 投稿时间：2020-05-11 修订日期：2020-05-29 |
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| 中文关键词 分类方法 浮游植物群落 功能群 水库 环境响应 |
| 英文关键词 classification phytoplankton community functional group reservoir environmental response |
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| 中文摘要 |
| 浮游植物群落对环境变化敏感，常用于评价水质和生态系统健康状态，但其对环境响应受类群单元的影响.为了解不同类群划分方法对浮游植物群落与环境响应关系的影响，以南亚热带地区8座水库的夏季浮游植物群落为研究对象，比较了分别以种（species）、属（genus）和门类（phyla）、形态功能群（morphology-based functional groups，MBFG）和生境模板功能群（functional groups，FG）为类群单元下浮游植物群落与环境因子的响应关系的差异.结果表明，8座水库均为中营养水体，以水温高（32.6±1.1）℃和有效光场弱（Zeu/Zm为0.48±0.28）为特征，水库间环境差异主要体现在溶解性营养盐的梯度上，溶解性营养盐的梯度显著高于总营养状态、温度和有效光照强度的环境梯度（P<0.05）.群落中种和属水平的类群单元多但生物量低，MBFG功能群和门类类群单元少但生物量高，导致虽然种属归类法的群落距离大于其他归类法，但种和属类群划分法的物种梯度（SCBD）和样点梯度（LCBD）均小于MBFG功能群和门类归类法.统计分析表明，5种类群划分法中只有MBFG和门类归类法的群落梯度对溶解性营养盐梯度有显著的响应关系，尤其是对pH值和PO43--P浓度变化的响应；只有MBFG和门类归类法的群落梯度与营养状态指数（TSI）变化有显著回归关系.以上结果表明，当环境变化主要体现在营养盐的供应差异时，MBFG和门类类群划分法对环境识别的灵敏度高于其他方法. |
| 英文摘要 |
| Phytoplankton communities are sensitive to environmental changes and are used to assess water quality and ecosystem states. However, their responses to environment are affected by the classifications. To understand the impact of different classifications, the response relationship between phytoplankton communities and environment were compared with five phytoplankton classifications (species, genus, phyla, morphology-based functional groups, and functional groups) by investigating eight reservoirs in summer in the southern subtropical region. The eight reservoirs were mesotrophic and their environment was characterized by a high temperature (32.6±1.1)℃ and low light bioavailability (Zeu/Zm was 0.48±0.28). The variance of dissolved nutrients contributed to the main environmental differences between the eight reservoirs. The environmental gradient, in terms of dissolved nutrients concentration, was significantly higher than in terms of total nutritional status, temperature, and light bioavailability (P<0.05). The number of species and genus was higher but their biomass was lower than those of other classifications. This contributed to the higher Bray-Curtis distance and lower species gradient (SCBD) and location gradient (LCBD) of phytoplankton communities with species and genus classifications than other classifications. A statistical analysis showed that only the phytoplankton community gradient with MBFG and phylum classifications was significantly correlated with environmental gradient, in particular the gradient of pH value and PO43--P concentration. A significant regress was detected between the TSI gradient and the phytoplankton community gradient with MBFG and phylum classifications. In conclusion, as the variance of environment stemmed from the supply of nutrients, the response of the phytoplankton community classified with MBFG and phylum was more sensitive than other classifications. |
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