纳木措不同水文期水体酵母菌影响因素分析  

Environmental factors affecting yeast community structure during different hydrological periods in Nam Co Lake

作　　者：王艳红 郝兆 薛文凯 孟华旦尚 德吉[1] 郭小芳[1] WANG Yan-hong;HAO Zhao;XUE Wen-kai;MENG Hua-dan-shang;DE Ji;GUO Xiao-fang(School of Science,Tibet University,Lhasa 850000,China)

机构地区：[1]西藏大学理学院,西藏拉萨850000

出　　处：《中国环境科学》2023年第4期2028-2038,共11页China Environmental Science

基　　金：国家自然科学基金资助项目(31960024);2019年中央支持地方高校改革发展基金资助项目(藏财预指[2019]01号)。

摘　　要：于2020年8月(丰水期)和2021年5月(枯水期)对纳木措水体可培养酵母菌群落结构特征进行研究,共分离得到33个属70个种的2411株酵母菌.生物信息学和统计学结果显示,纳木措不同水文期水体酵母菌总丰度、物种组成和群落结构存在显著差异,枯水期水体pH值、电导率、化学需氧量及总氮显著高于丰水期.中性群落拟合及相关性分析显示,相较随机过程而言,确定性过程对水体可培养酵母菌群落结构的影响更为明显,水体氨氮、总磷、电导率以及化学需氧量是显著影响水体酵母菌群落结构的环境因子.生态位量度显示,枯水期酵母菌优势种生态位宽度指数和生态位重叠指数均低于丰水期,环境因子对优势酵母菌类群的资源利用方式及种间关系具有较大影响.对枯水期水体营养水平的监测有助于纳木措水体酵母菌资源的保护.Structure of the culturable yeast community in Nam Co Lake was investigated in August 2020(wet season)and May 2021(dry season).As a result,2411 yeast isolates belonging to 33 genera(70 species)were identified.Bioinformatics and statistical analysis indicated that the total abundance,species composition and community structure of yeasts were significantly different between different periods.Moreover,pH,electrical conductivity,chemical oxygen demand,and total nitrogen in the dry season were significantly higher than those in the wet season.The neutral community model and correlation analysis showed that the yeast community structure was more influenced by deterministic processes,and ammonia nitrogen,total phosphorus and chemical oxygen demand were the remarkable factors that could influence the yeast community structure in Nam Co Lake.Niche measurement indicated that niche breadth and niche overlap value of the dominant species of yeasts in the dry season were lower than those in the wet season.Environmental factors have larger impact on resource utilization pattern and interspecific relationship of the dominant yeast species.Water quality monitoring would contribute to the conservation of yeast resources in Nam Co Lake,especially during the dry season.

关 键 词：纳木措 酵母菌 丰水期 枯水期 生态位 

分 类 号：X172[环境科学与工程—环境科学]