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Inner Mongolia University of Science and Technology (2020)

Analysis of Phytoplankton Niche and Interspecific Association in Lakes in Cold and Arid Regions

申涵;

Titre : Analysis of Phytoplankton Niche and Interspecific Association in Lakes in Cold and Arid Regions

Auteur : 申涵;

Grade : Master’s Theses 2020

Université : Inner Mongolia University of Science and Technology

Résumé
Two kinds of ecological theories,niche and interspecific association,have been widely used to explain the structure of species community.However,most of these studies focus on land plants,and few studies have been done to quantify the niche parameters and interspecific association characteristics of phytoplankton.Nanhai Lake,a typical urban lakes in cold and arid regions,is an important wetland resource for the ecological balance in the Baotou section of the Yellow River.Phytoplankton is the indicator organism of nutrient status and ecological conditions in lake ecosystems,and the dynamic changes of its community structure directly affect the structure and function of lake ecosystem and also indirectly reflect the health status of the ecosystem.In order to investigate the phytoplankton community structure,succession rules and their relationship with habitats in Nanhai Lake of Baotou city,the phytoplankton community and physical-chemical indicators from Sep.2018 to Aug.2019 was identified and tested at 12sampling sites in Nanhai Lake.Based on the analysis of the ecological characteristics of phytoplankton community and the niche and interspecific association of dominant species,this study discussed the the dynamic changes of phytoplankton community and its correlation with habitat,which is of great significance to the ecological environment management and protection of Nanhai Lake,and can also provide reference for the study of small urban lakes in cold and arid regions.The main results are as follows :(1)A total of 173 species of 77 genera of 7 phyla of phytoplankton were identified during the study period,and most of which were mainly species in Chlorophyta,followed by species in Cyanophyta and Bacillariophyta.The seasonal alternations of species were obvious,mainly presenting a changing trend that more species were in summer and less in winter,while the spatial order of species from high to low was middle of the lake,northeast,southwest.The phytoplankton density on average was 42.93×106 cells/L,and Comparatively,Cyanophyta,Chlorophyta and Bacillariophyta were the main groups to compose the quantity of phytoplankton in Nanhai Lake.The seasonal variation of phytoplankton density was basically in the shape of"V"with the lowest in winter,and the spatial variation of phytoplankton density was decreasing from the middle of the lake to the shore.

Mots clés : Nanhai Lake; Cold and arid regions; Phytoplankton; Dominant species; Niche; Interspecific association;

Présentation (CNKI)

Page publiée le 15 octobre 2020