西双版纳南腊河浮游植物群落结构及其与水环境因子的关系

摘要

为研究南腊河浮游植物群落结构变化特征及其与水环境因子的关系，分别于2013年8月和11月对西双版纳地区南腊河的浮游植物和环境因子进行调查，运用多元分析方法分析了浮游植物在南腊河的分布情况及其与环境因子间的关系。结果显示，南腊河上游水体的优势种群为蓝藻，下游水体的优势种群为硅藻。浮游植物密度在季节间变化不显著，而空间分布则表现出极显著性差异。比较浮游植物多样性指数后发现，南腊河属于α／β－中污型河流。大部分样点的浮游植物群落结构未发生明显的季节性变化。主成分分析（PCA）和典范对应分析（CCA）显示，总氮可能是雨季南腊河浮游植物生长的主要限制因子，而水温则是旱季影响浮游植物的主导因素，浊度和固体悬浮物浓度在旱季对浮游植物密度的抑制效果明显。%A detailed field survey of hydrological , chemical and biological resources was conducted to find out the changes of phytoplankton community structure and the relationship with environmental factors in August and November 2013 in Nan-la River, which located in Xishuangbanna , Yunnan Province of China .Multivariate analysis method was used to calculate the distributions of phytoplankton and its relationship with environmental factors .Results showed that Cyanophyta was domi-nant population in the upstream water while Bacillariophyta was dominant population in the downstream .The cell density of phytoplankton did not change significantly among the seasons , but showed extremely significant difference in spatial distri -bution.It was found that the water body of Nanla River belonged to α/β-ms type compared the phytoplankton biodiversity index.No obvious seasonal changes of phytoplankton community structure were found in spatial distribution .Results of principal component analysis and canonical correspondence analysis indicated that total nitrogen (TN) was likely to be a limiting factor for the growth of phytoplankton in the rainy season .And the water temperature (WT) was the main factor af-fecting phytoplankton in the dry season .Meanwhile turbidity (TUR) and suspended solids (SS) had inhibitory effect on the density of phytoplankton in the dry season .