温度和营养盐水平对淡水浮游细菌群落结构的潜在影响

南京大学学报(自然科学版) ›› 2016, Vol. 52 ›› Issue (4): 590–.

温度和营养盐水平对淡水浮游细菌群落结构的潜在影响

陈　祯^1，2，何　聃^2，3，任丽娟^2*

出版日期:2016-07-23 发布日期:2016-07-23
作者简介: 1.中国科学院大学，北京，100049；2.中国科学院南京地理与湖泊研究所，南京，210008；3．中国科学院南京土壤研究所，南京，210008
基金资助:

基金项目：国家自然科学基金(31225004，31500376，U1202231)

收稿日期：2016－04－27
*通讯联系人，Email：wisdom503@126.com

The potential impacts of temperature and nutrient levels on freshwater bacterioplankton community structure

Chen Zhen^1，2，He Dan^2，3，Ren Lijuan²*

Online:2016-07-23 Published:2016-07-23
About author: 1.University of Chinese Academy of Sciences，Beijing，100049，China；2．Nanjing Institute of Geography and Limnology，Chinese Academy of Sciences，Nanjing，210008，China；3．Institute of Soil Science，Chinese Academy of Sciences，Nanjing 210008，China

摘要/Abstract

摘要： 为研究温度与水体营养条件对淡水浮游细菌群落的影响，进行室内模拟实验，设立了15 ℃、25 ℃和35 ℃三种温度处理和添加营养盐、未添加营养盐两种营养处理，总计6个处理组，每个处理组设计3个重复．实验结束后测定了环境因子、植物生物量、浮游细菌群落丰度和结构．结果发现，不同温度和营养盐条件下，环境中的DO、pH、NO－3N、NO－2N以及植物生物量(主要为丝状绿藻，FGA)都存在明显差异．水体温度增加及营养盐浓度的升高均促进了FGA的生长，FGA的增殖明显去除了水体中的氮磷元素，使高温和添加营养盐处理组中浮游细菌丰度差异很小．在15 ℃不添加营养盐处理中，因FGA的生物量最小，其营养盐浓度明显比其他处理组高，因此，浮游细菌群落结构也与其他处理组显著不同，并且这种差异随处理间温度差异的增加而更加明显．综上所述，在淡水生态系统中，温度和营养盐作为重要的非生物因素，与水体系统中植物的生长、浮游细菌群落结构间存在复杂而紧密的相互作用，典型相关性分析发现温度和营养盐的添加不仅能直接影响浮游细菌群落的结构，还可以通过丝状绿藻的生长间接影响浮游细菌群落组成．

Abstract: To investigate bacterioplankton community composition(BCC)under different temperature and nutrient conditions，18 microcosms combining three temperature scenarios(15 ℃，25 ℃and 35 ℃，respectively)and two nutrient levels(control and enriched)were established.After three months experiment，water environmental factors，plant biomass(mainly Filamentous green aglea，FGA)，bacterioplankton community abundance and composition were studied.Extremely differences of DO，pH，NON，NON，FGA biomass were detected under different temperature and nutrient treatments.Both increased temperature(25 ℃and 35 ℃)and nutrient enrichment stimulated the extensive growth of FGA.The proliferation of FGA had pronounced removal of water nutrients，so that the concentrations of N and P together with the bacterioplankton abundance were similar in nutrient enriched groups.In 15 ℃treatments without nutrient enrichment，the influence of FGA was least and the nutrient concentrations were evidently higher than others，thus BCC there was pronouncedly different from the other treatments.Between 15 ℃treatments without nutrient enrichment and the other treatments，the BCC divergence increased with the increasing differences of temperatures.In summary，we found that temperature and nutrient，as important abiotic factors for freshwater ecosystems，had complex interactions with plants and bacterioplankton community composition in freshwater ecosystem.The elevated temperature and nutrient conditions not only directly shifted BCC，but also indirectly impacted BCC through the growth of FGA.

陈　祯^1，2，何　聃^2，3，任丽娟^2*
. 温度和营养盐水平对淡水浮游细菌群落结构的潜在影响[J]. 南京大学学报(自然科学版), 2016, 52(4): 590–.

Chen Zhen^1，2，He Dan^2，3，Ren Lijuan²*. The potential impacts of temperature and nutrient levels on freshwater bacterioplankton community structure[J]. Journal of Nanjing University(Natural Sciences), 2016, 52(4): 590–.

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