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乌梁素海冻融前后浮游植物群落结构特征及其影响因素分析
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  • 英文篇名:Phytoplankton Community Structure Characteristics and Its Influencing Factors before and after Freezing and Thawing in Wuliangsuhai Lake
  • 作者:孙鑫 ; 李兴 ; 勾芒芒
  • 英文作者:SUN Xin;LI Xing;GOU Mangmang;College of Geography Science, Inner Mongolia Normal University;School of Ecology and Environment, Inner Mongolia University;Inner Mongolia Engineering Research Center for Water-saving Agriculture, Inner Mongolia Normal University;Water Conservancy and Civil Engineering Department, Inner Mongolia Technical College of Mechanics & Electrics;
  • 关键词:乌梁素海 ; 冻融 ; 浮游植物群落 ; 冗余分析
  • 英文关键词:Wuliangsuhai;;freezing and thawing;;phytoplankton;;redundancy analysis
  • 中文刊名:生态环境学报
  • 英文刊名:Ecology and Environmental Sciences
  • 机构:内蒙古师范大学地理科学学院;内蒙古大学生态与环境学院;内蒙古师范大学节水农业工程研究中心;内蒙古机电职业技术学院水利与土木建筑工程系;
  • 出版日期:2019-04-18
  • 出版单位:生态环境学报
  • 年:2019
  • 期:04
  • 基金:内蒙古自治区科技计划项目(201702111);; 国家自然科学基金项目(51469026);; 内蒙古自然科学基金项目(2016MS0553)
  • 语种:中文;
  • 页:174-183
  • 页数:10
  • CN:44-1661/X
  • ISSN:1674-5906
  • 分类号:X524;X173
摘要
湖泊冰封期前后水生态环境发生了巨大变化,浮游植物群落结构特征也不例外。以往对冰封期湖泊水体在冻融前后浮游植物群落特征研究鲜见报道,为探明冰封期前后湖泊水体浮游植物群落特征及其影响因素,以乌梁素海湖区为研究对象,布置12个采样点,于2016年湖泊水体结冰前的10月、11月、2017年冰封期1月和融冰后的4月和5月采集冰样和水样,分析冰封期前后该湖区浮游植物群落时空分布及其变化情况,同时利用冗余分析法(RDA)分析了浮游植物物种与环境因子的关系。结果表明,调查期间观察到的浮游植物共计6门69属120种,种类组成以硅藻为主。浮游植物种群结构结冰前蓝藻占优势;随着冰封期的到来,蓝藻占比渐少,硅藻占比渐多;融冰后蓝藻占比渐多,硅藻占比渐少。乌梁素海冰封期前后月份南部明水区浮游植物聚集,冰封期1月湖区北部入湖口附近浮游植物丰度较高。根据优势种指示情况可知,乌梁素海冻融前后水体处于富营养化状态;丰富度指数反映水体总体污染状况较轻,均匀度指数反映浮游植物分布整体较为均匀稳定;冰封期1月水体浮游植物硅藻门占比很大,群落结构相对简单。RDA排序揭示氨氮(NH_4~+-N)、总磷(TP)、温度(t)、总溶解性固体(TDS)、溶解氧(DO)和透明度(SD)为影响乌梁素海水体冻融前后浮游植物物种分布格局的主要环境因子。研究结果可为寒区湖泊浮游植物结构特征变化机理研究提供依据。
        Great changes have taken place in the aquatic environment before and after the ice-blocked period of the lake, including the characteristics of phytoplankton community structure. In the past, studies on the characteristics of phytoplankton communities in lake waters before and after freezing and thawing were rarely reported. In order to clarify the mechanism of phytoplankton impacts on the lake water before and after the ice-freezing period, ice and water samples were collected from 12 sampling sites in Wuliangsuhai Lake area in October, November 2016 and January, April and May 2017, the spatial and temporal distribution of phytoplankton community and its changes were investigated during the period, At the same time, the relationship between phytoplankton species and environmental factors was analyzed by redundancy analysis(RDA). The results showed that a total of 6 phyla, 69 genera and 120 species of phytoplankton were observed during the investigation in Wuliangsuhai, the species composition was mainly Bacillariophyta. The phytoplankton population structure predominated with Cyanobacteria before and after freezing and thawing. With the arrival of the ice-sealing period, the proportion of Cyanobacteria decreased, and the proportion of Bacillariophyta increased. After the ice-sealing period, the proportion of Cyanobacteria increased, and the proportion of Bacillariophyta gradually decreased. The phytoplankton in the southern Mingshui area was clustered before and after the ice-sealing period in Wuliangsuhai. Individual density of phytoplankton in the ice-freezing period was higher near the lake entrance in the northern part of the lake. According to the indications of dominant species, the water body was eutrophic before and after freezing and thawing in Wuliangsuhai; The Margalef index reflected that the overall pollution situation of the water body was light,and the Pielou index reflected the overall uniformity and stability of phytoplankton distribution. In the ice-freezing period, the population of Bacillariophyta was dominant, and the community structure was relatively simple. The RDA ranking showed that NH_4~+-N, TP, t, TDS, DO and SD were the main environmental factors affecting the distribution pattern of phytoplankton community before and after freezing and thawing in Wuliangsu. The results can provide a basis for the study on the mechanism of phytoplankton structural characteristics change in cold lakes.
引文
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