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引用本文:刘海平,叶少文,杨雪峰,张良松,钟国辉,李钟杰.西藏尼洋河水生生物群落时空动态及与环境因子的关系:1.浮游植物.湖泊科学,2013,25(5):695-706. DOI:10.18307/2013.0511
LIU Haiping,YE Shaowen,YANG Xuefeng,ZHANG Liangsong,ZHONG Guohui,LI Zhongjie.Spatial-temporal dynamics of aquatic organism community and their relationships to environment in Niyang River,Tibet: 1. Phytoplankton. J. Lake Sci.2013,25(5):695-706. DOI:10.18307/2013.0511
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西藏尼洋河水生生物群落时空动态及与环境因子的关系:1.浮游植物
刘海平1,2,3, 叶少文2, 杨雪峰4, 张良松5, 钟国辉1, 李钟杰2
1.西藏大学农牧学院, 林芝 860000;2.中国科学院水生生物研究所, 淡水生态与生物技术国家重点实验室, 武汉 430072;3.中国科学院大学, 北京 100049;4.锡林浩特市第六中学, 锡林浩特 026000;5.福建省水产技术推广总站, 福州 350003
摘要:
于2008-2009年按照季节调查了西藏尼洋河浮游植物群落的组成、丰度和多样性,并运用多元统计方法定量分析了浮游植物的空间和季节变化特征及其与主要环境因子之间的关系.结果显示,尼洋河浮游植物共计7门29科48属,其中硅藻为优势浮游藻类.浮游植物Shannon-Wiener多样性指数(Pielou均匀度指数)在尼洋河中游(尼洋河下游)最高,其他河段呈下降趋势,符合中间高度膨胀假说.尼洋河沿程浮游植物的总丰度、物种丰富度、Shannon-Wiener多样性指数以及Pielou均匀度指数不存在显著差异,夏季的浮游植物物种丰富度与其他季节的存在显著差异,夏季总丰度与秋、冬季的存在显著差异,冬季的浮游植物Shannon-Wiener多样性指数与春季的存在显著差异,冬季的均匀度指数与其他3个季节的存在显著差异.尼洋河浮游植物季节演替依赖于外源性水源补充,沿程演替则与河道底质有着很大关系.典范对应分析(CCA)表明,尼洋河硅藻门舟形藻科的藻类与理化因子铵态氮、表层pH、表层水温相关,部分蓝藻以及绿藻与水质理化因子也存在着关联.分类回归树(CART)模型预测了尼洋河着生藻类时空分布与主要环境因子之间的定量关系,尼洋河浮游植物群落总丰度和均匀度指数受pH值影响较大,pH值低于8.0的水域浮游植物均匀度指数比pH值高于8.0的水域大,尼洋河浮游植物Shannon-Wiener多样性指数受到河道底质影响较大,底质为黏土的水域浮游植物Shannon-Wiener多样性指数较底质为砂石的大.这些关键环境因子对尼洋河水域浮游植物的时空变化有着重要的指示作用,建议加强对浮游植物及这些环境因子的关注,保障尼洋河水域生态环境的可持续发展.
关键词:  西藏  尼洋河  浮游植物  时空动态  主成分分析  典范对应分析  分类回归树
DOI:10.18307/2013.0511
分类号:
基金项目:西藏科技厅地区基金重点项目资助
Spatial-temporal dynamics of aquatic organism community and their relationships to environment in Niyang River,Tibet: 1. Phytoplankton
LIU Haiping1,2,3, YE Shaowen2, YANG Xuefeng4, ZHANG Liangsong5, ZHONG Guohui1, LI Zhongjie2
1.Agricultural and Animal Husbandry College of Tibet University, Linzhi 860000, P. R. China;2.State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, P. R. China;3.University of Chinese Academy of Sciences, Beijing 100049, P. R. China;4.NO. 6 Middle School Xilinhot, Xilinhot 026000, P. R. China;5.Fujian Marine Products Technical Promotion Station, Fuzhou 350003, P. R. China
Abstract:
We have investigated seasonally the constitution,abundance and diversity of phytoplankton in Niyang River,the branch of the Yarlung Zangbo River,Tibet from 2008 to 2009,and taken quantitative analyses to study spatio-temporal characteristics of phytoplankton and their responses to environment using multivariate statistics method.The results are as follows.Firstly,phyto-plankton community in Niyang River belongs to 7 phyla,29 families and 48 genus,among them,Bacillariophyta is the dominant phytoplankton.Secondly,Shannon-Wiener diversity index for Niyang River is suitable to the theory about mid-altitude bulge, which is Shannon-Wiener diversity index (or Pielou evenness index) higher at the middle of Niyang River (or lower reaches of Niyang River),descending at either side of Niyang River.Thirdly,using Duncan comparison method to judge the difference among sampling sites and seasons for species richness,total abundance,Shannon-Wiener diversity index and Pielou evenness index,there is no significant difference among four sampling sites for four indices mentioned above.However,there is significant difference between the summer and other three seasons for species richness and total abundance.There is also significant difference between the winter and spring for Shannon-Wiener diversity index,and between the winter and other three seasons for Pielou evenness index.Seasonal succession of phytoplankton in Niyang River is mainly defendant on the supplement of exogenous water source,succession along Niyang River have a close relation with substrate of riverbed.Fourthly,based on the CCA method,there is a close relationship between water physical-chemical property and Naviculaceae algae from Bacillariophyta,and between water physical-chemical property and partial algae from Cyanophyta and Chlorophyta.Finally,we predicted the relationships between the total abundance of phytoplankton and environment factors based on CART method,the relationships between Shannon-Wiener diversity index of phytoplankton and environment factors based on CART method,and the relationships between Pielou evenness index of phytoplankton and environment factors based on CART method.The results reveal that pH value has a strong influence on the total abundance and Pielou evenness index of phytoplankton community in Niyang River.Pielou evenness index of phytoplankton is high at Niyang River sections where pH values are below 8 than those sections where pH values exceed 8.Shannon-Wiener diversity index of phytoplankton community in Niyang River is mainly influenced by substrate of Niyang River,specifically,Shannon-Wiener diversity index for the areas where the substrate is sandstone is higher than those areas where the substrate is clay.The paper also recommends paying close attention to phytoplankton and the environment factors mentioned above owing to their important indication function,in order to warrantee the sustainable development of Niyang River aquatic ecology.
Key words:  Tibet  Niyang River  phytoplankton  spatial-temporal dynamic  PCA  CCA  CART
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