多沙河流夏季浮游植物群落结构变化及水环境因子影响分析

发布时间：2018-08-13 16:43

【摘要】：目前,有关多沙河流中浮游植物群落特征与环境因子关系的研究报道极少。以黄河内蒙古河段为研究对象,研究多沙河流中浮游植物特征及其与环境因子之间的关系。从该河段上游至下游共设置了12个采样点进行浮游植物调查,并同步开展水温、溶解氧、总磷等水质因子的监测。在采用多样性指数、相似性指数等方法分析浮游植物群落特征的同时,也采用了非度量多维尺度法(Non-metric multidimensional scaling,NMDS)研究了浮游植物群落结构变化及其与环境因子的关系。研究结果表明:内蒙古河段从上游至下游,浮游植物种类组成以硅藻门和绿藻门为主;浮游植物生物量以硅藻门占优,而密度以蓝藻门占优;浮游植物物种数、密度与生物量沿程空间变化明显,呈现出两端低中间高的变化趋势。NMDS分析则进一步显示上下游两端的采样点与河段中间采样点浮游植物群落结构存在显著差异,结合水环境因子分析可知浊度(NTU)、悬浮物(SS)、COD对浮游植物群落结构存在显著影响,而总磷(TP)等营养盐因素影响较弱,这可能与黄河内蒙古河段河道地势及“水少沙多”的特征密切相关。
[Abstract]:At present, there are few reports on the relationship between phytoplankton community characteristics and environmental factors in sandy rivers. The characteristics of phytoplankton and the relationship between phytoplankton and environmental factors in sandy rivers in Inner Mongolia reach of Yellow River were studied. A total of 12 sampling sites were set up from the upper reaches to the lower reaches for phytoplankton investigation, and water temperature, dissolved oxygen, total phosphorus and other water quality factors were monitored simultaneously. The characteristics of phytoplankton community were analyzed by means of diversity index and similarity index, and the relationship between phytoplankton community structure and environmental factors was also studied by Non-metric multidimensional scaling method (NMDS). The results showed that the species composition of phytoplankton was mainly diatoms and chlorophyta, the biomass of phytoplankton was dominated by phylum diatom, but the density was dominated by phylum cyanophyta, and the species number of phytoplankton was dominant. The spatial variation of density and biomass along the course was obvious. The analysis of NMDS showed that there were significant differences in phytoplankton community structure between the sampling points of upper and lower reaches and the middle sampling points of the river. Combined with the analysis of water environmental factors, it was found that the turbidity (NTU), suspended substance (SS) had a significant effect on the phytoplankton community structure, while the total phosphorus (TP) had a weak effect on the phytoplankton community structure. This may be closely related to the topography of the Yellow River in Inner Mongolia and the characteristics of "less water, less sediment".
【作者单位】：水利部中国科学院水工程生态研究所//水利部水工程生态效应与生态修复重点实验室;青海大学;黄河水资源保护研究院;
【分类号】：X173

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