贵州百花湖夏季浮游植物昼夜垂直分布特征研究

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 贵州百花湖夏季浮游植物昼夜垂直分布特征 DOI: 10.5846/stxb201301070054 作者: 作者单位: 贵州师范大学生命科学学院,贵州师范大学生命科学学院,贵州师范大学生命科学学院,贵阳市环境监测中心站 作者简介: 通讯作者: 中图分类号: S932.7 基金项目: 贵州省科学技术基金项目[黔科合SY（2010）3012]；国家重点基础研究发展计划973前期（2012CB426506）；贵阳市社会发展公关项目（2008筑科农合同字第5-3号）；贵阳市社会发展攻关项目（2011筑科农合同字第59号） Diel vertical distribution patterns of phytoplanktion in Baihua Reservoir, Guizhou Province Author: Affiliation: School of Life Sciences,Guizhou Normal University,School of Life Sciences,Guizhou Normal University,,Environmental Monitoring Centre of Guiyang City Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:为了探讨浮游植物在水体中的昼夜垂直分布格局，于2012年7月31日至8月1日对百花湖（水库）浮游植物进行昼夜24 h定点分层研究。研究结果表明：蓝藻、绿藻、硅藻种类数在水体中具有明显的分层现象，蓝藻种类数在0.5-2 m居多，绿藻种类数在0.5-6 m明显多于7-14 m，硅藻种类数主要分布在6 m及以深的水层中。湖泊假鱼腥藻（Pseudanabaena limnetica）为绝对优势种，相对丰度为82.69%。8：00时湖泊假鱼腥藻在2-3 m处聚集程度最高，10：00时聚集程度最高的水层上升至0.5 m，10：00-12：00湖泊假鱼腥藻的细胞丰度由0.5 m向2 m扩增，12：00时在2 m处达到全天峰值，此时0.5 m处的细胞丰度是除6：00外的最小值，12：00-14：00湖泊假鱼腥藻的细胞丰度由2 m向0.5 m扩增，16：00时又大量聚集于1 m处，说明湖泊假鱼腥藻在白天具有明显的垂直迁移现象；湖泊假鱼腥藻丰度的MI指数白天在1.45-2.07之间，夜间在1.40-1.46之间，变化趋势与时间深度等值图结果相符，说明湖泊假鱼腥藻在水体中昼夜均呈聚集分布，且白天的聚集程度及变化幅度大于夜间；百花湖浮游植物总丰度的昼夜垂直分布格局与湖泊假鱼腥藻一致；水体中浮游植物总丰度和湖泊假鱼腥藻丰度夜间低于白天。光照的昼夜交替和水柱温差的昼夜变化是影响浮游植物总丰度和湖泊假鱼腥藻垂直分布格局昼夜变化的重要环境因素。 Abstract:The mechanism of causing the migration and accumulation of bloom-forming species is important content for the bloom occurred by cyanobacteria. In recent years, the structure of phytoplankton community has changed in Baihua Reservoir. However, there was no such information in previous literatures. This paper was based on the research of Baihua Reservoir to elaborate diel vertical migrations of the phytoplankton. It may be important to understand the mechanism of bloom and explain the regularities of the vertical migrations. The study on diel vertical distribution of phytoplankton in Baihua Reservoir was carried out from July 31 to August 1, 2012. The sampling sites was located at the center of the Baihua Reservoir. All the samples of phytoplankton were carried on qualitative and quantitative analysis in laboratory. Meanwhile, photosynthetically available radiation and water temperature were measured. Patterns of diel vertical distribution were elucidated quantitatively using two different analysis methods. Firstly, mapping method was used to describe the time-depth distribution of phytoplankton individuals and abiotic factors. Secondly, the significant differences of vertical distribution from a state of randomness were tested with Morisita's index. The correlations between Morisita's index of biological indicators and environmental factors were analyzed by Statistical Product and Service Solutions. The results showed that the number of phytoplankton species about cyanobacteria, chlorophyta and bacillariophyta was discriminable at different depths. Cyanobacteria mainly distributed from 0.5 m to 2 m, chlorophyta from 0.5 m to 6 m and bacillariophyta mainly distributed from 6 m to 14 m. Pseudanabaena limnetica was the predominant species, accounted for 82.69％of total abundance. The Pseudanabaena limnetica stratified in the 2-3 m at 8:00a.m.. The cells were tent to migrate to the surface during after 2 hours. The Pseudanabaena limnetica above the layer sink down from 10:00a.m. to 12:00a.m., appearing the maximum in 2 m. They floated up again from 12:00a.m. to 14:00, and aggregated in 1 m at 16:00. It showed that Pseudanabaena limnetica presented the vertical migration in the day. The morisita's index of Pseudanabaena limnetica was between 1.45 and 2.07 in the day, and between 1.40 and 1.46 in the night. Combined with the depth-time distribution, it showed that Pseudanabaena limnetica aggregated in water layers. And the aggregation degree was lower in the night than that in the day. Pseudanabaena limnetica could reflected the total of phytoplankton abundance. Densities of phytoplankton and Pseudanabaena limnetica were higher in the day than that in the night. The distribution patterns of phytoplankton and Pseudanabaena limnetica were coincident with the photosynthetically available radiation and water column temperature difference. Carbohydrate ballasting and gas vesicle burst might be the main mechanisms for buoyancy changes in Pseudanabaena limnetica during the period. At the same time, it was probable that the change of water column temperature difference caused passive migration of Pseudanabaena limnetica. 参考文献 相似文献 引证文献