| 不同光照条件对浮游植物生物量与多样性的影响 |
| Effects of Illumination Intensity on Phytoplankton Community Biomass and Diversity |
| 投稿时间：2017-04-05 修订日期：2018-01-19 |
| DOI：10.15928/j.1674-3075.2018.01.006 |
| 中文关键词:光照条件 浮游植物 群落结构 多样性 生物量 |
| 英文关键词:light intensity phytoplankton community structure diversity biomass |
| 基金项目:国家科技合作与交流专项（2014DFE70070）；国家自然科学基金青年科学基金项目（51209190, 51509086）；国家自然重大计划项目（91647207）；国家水体污染控制与治理科技重大专项（2014ZX07104-005-02）。 |
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| 中文摘要: |
| 通过构建光照强度与浮游植物生物量和群落结构特征参数的关系曲线，为三峡水库水华预测预报模型的构建提供基础数据，同时也为水库调度的方案提供理论依据。基于三峡水库野外原位观测数据的分析结果，针对性设计不同梯度光照强度下浮游植物的生长演替规律室内控制实验。结果表明：（1）光照是影响浮游植物生物量和多样性的关键要素，光照强度0～4500 lx，浮游植物的生物量随着光照强度的增加而增加，在光照强度为4500 lx时，浮游植物生物量达到最大，但光强超过4500 lx之后，浮游植物的生物量随着光照强度的增加而减少；光照强度0～1500 lx，浮游植物群落多样性随着光强的增加而增加，在光照强度为1500lx时，浮游植物群落多样性达到最大；光照强度1500～4500 lx，浮游植物群落多样性随着光照强度的增加而减少；当光强超过4500 lx，浮游植物群落多样性随着光照强度的增加而增加；（2）从制定三峡水库生态调度方案的角度来看，当光照强度在1500lx时，浮游植物生物量达到最低，此时其群落多样性达到最大，为最佳的调度方案光照参数；（3）浮游植物生物量（y）与光照强度（x）的关系为：y = 2×10-8x3 -5×10-4x2 + 3.1923x - 122.92（R2 = 0.934，P<0.01），两者极显著相关；多样性指数（y）与光照强度（x）的关系式为：y = 2×10-12x3 - 3×10-8x2 + 10-4x + 0.3266（R2 = 0.554，P<0.01），两者极显著相关。 |
| 英文摘要: |
| Since the impoundment of Three Gorges Reservoir in 2003, algae blooms have occurred in the reservoir bays of some tributaries and pose an ecological risk to the reservoir system. In order to explore the effect of illumination on phytoplankton community biomass and diversity, we carried out a laboratory experiment on the succession of a phytoplankton community under different light intensities that were selected based on conditions observed at Three Gorges Reservoir. Phytoplankton biomass and diversity parameters were then fit to light intensity data in regression equations to screen for an optimal illumination intensity that supports phytoplankton diversity without stimulating excessive phytoplankton growth. Results provide basic data for predicting algal blooms in Three Gorges Reservoir and a theoretical basis for reservoir regulation. Mixed algae species for the study were collected from the middle reach of Xiangxi River backwater where algae blooms frequently occur. Seven light intensities (0, 1500, 3000, 4500, 6000, 8000, 10000lx) were used and all trials were carried out in the laboratory without exogenous light at20℃and a 1:1 light-dark cycle. From April 8-18 of 2015, phytoplankton samples were collected from each treatment once a day at 9:30for determination of phytoplankton biomass and diversity. At the same time, water temperature, light intensity, DTN, DTP and Chl-a content for each treatment were measured. There were two primary results: (1) The content of Chl-aby treatment group was in the order; 4500lx>3000lx>6000lx>8000lx>1500lx>10000lx> 0lx, indicating that the optimal light intensity for phytoplankton growth is 4500lx.Light intensity was the key factor affecting the biomass and diversity of phytoplankton community. Light intensity also affected succession of the phytoplankton community structure. Phytoplankton diversity indices increased with light intensity up to 1500 lx, decreased up to4500 lx and then increased.(2) Phytoplankton biomass varied significantly with light intensity and the relationship was described by the regression equation: y = 2×10-8x3 - 5×10-4x2 + 3.1923x-122.92 (R2 = 0.934, P<0.01). Phytoplankton diversity indices also varied significantly with light intensity, as described by the equation: y = 2×10-12x3 - 3×10-8x2 + 10-4x + 0.3266 (R2 = 0.61，P<0.01). A light intensity of 1500lxsupports phytoplankton diversity without stimulating excessive growth and is therefore optimal for the ecology of Three Gorges Reservoir. |
| 严广寒,刘德富,张佳磊,刘璇,贡丹丹.2018.不同光照条件对浮游植物生物量与多样性的影响[J].水生态学杂志,39(1):37-43. |
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