汝溪河浮游硅藻功能群特征及其与环境因子相关性分析

发布时间：2018-03-17 20:32

本文选题：浮游硅藻　切入点：功能群　出处：《环境科学》2017年08期 　论文类型：期刊论文

【摘要】：基于不同水文期特点,分别在平水期(2014年4月)、丰水期(2014年7月)、枯水期(2014年12月)对三峡库区支流汝溪河的浮游硅藻及理化参数进行采样监测,应用功能群分类和数理统计分析等手段,探讨汝溪河不同水文期浮游硅藻功能群特征及其与环境因子间的相互关系.结果表明:3个水文期,汝溪河共发现浮游硅藻功能群10个,分别为A、B、C、D、L_o、MP、P、T_B、X3、S1类群,其中种类最多的功能群是MP类群,数量最多的是D类群.多元逐步回归分析发现,影响平水期功能类群密度最重要的环境因子为总氮(TN);与丰水期功能群密度显著相关的环境因子为透明度(SD);浊度(Tur)、碱度和pH以及电导率则是影响枯水期功能群密度的主要环境因子.RDA分析结果显示,影响汝溪河浮游硅藻功能群多样性的主要环境因子含水温(WT)、电导率(Spc)、氧化还原电位(ORP)、溶解氧(DO)、硝态氮(NO_3~--N)等.因此,功能群能较好反映汝溪河的生境特点,而氮营养元素对汝溪河浮游植物功能群变化及水质的影响应引起关注.
[Abstract]:Based on the characteristics of different hydrological periods, the phytoplankton and physical and chemical parameters of Ruxi River, a tributary of the three Gorges Reservoir area, were sampled and monitored in the normal water period (April 2014), the high water period (July 2014) and the dry season (December 2014). By means of functional group classification and mathematical statistical analysis, the characteristics of phytoplankton functional groups and their relationship with environmental factors in different hydrological periods of Ruxi River were discussed. The results showed that 10 functional groups of planktonic diatoms were found in Ruxi River in 3 hydrological periods. The functional groups were MP group and D group, respectively. The multiple stepwise regression analysis showed that the most functional group was MP group and the most abundant group was D group, and the multivariate stepwise regression analysis showed that the functional group was MP group and D group was the most abundant group, and the multiple stepwise regression analysis showed that the most functional group was MP group and D group was the largest group. The most important environmental factor affecting the density of functional groups in plain water period is TNN; the environmental factor that is significantly related to the density of functional groups in high water period is transparent SDN; the turbidity turbid, alkalinity, pH and conductivity affect the density of functional groups in dry season. The results of RDA analysis show that, The main environmental factors affecting the diversity of phytoplankton functional groups in Ruxi River include water temperature, electrical conductivity, redox potential (ORP), dissolved oxygen (DOA), nitrate-N (no _ 3-N) -N, and so on. Therefore, the functional groups can better reflect the habitat characteristics of the Ruxi River. The effect of nitrogen nutrition on phytoplankton functional group and water quality in Ruxi River should be paid more attention to.
【作者单位】：西南大学生命科学学院三峡库区生态环境教育部重点实验室重庆市三峡库区植物生态与资源重点实验室;
【基金】：中央高校基本科研业务费专项(XDJK2016C111) 西南大学博士基金项目(SWU110065)
【分类号】：X173;X52

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