摘要
淡水湖泊湿地生态系统中,微生物在生物地球化学循环和能量流动方面具有重要作用,是湿地行使其生态功能的重要参与者。以我国五大淡水湖泊湿地为研究对象,基于16S rRNA基因测序数据的分析,利用距离衰减关系模型、冗余分析、Mantel检验、方差分解分析和共发生网络分析探究了土壤细菌和古菌群落构建在不同湖泊湿地之间的差异及其共现性特征。结果发现:在地理气候因子(样点经纬度、海拔和年均降水)与土壤理化因子(pH,TOC,NH4+-N和NO3--N)的共同驱动下,五大淡水湖泊湿地细菌和古菌群落存在显著的生物地理分布特征;各湿地共有的优势类群和具有共发生网络模块化结构的微生物类群,是参与湿地生态系统中产甲烷、甲烷氧化、硫酸盐还原、硝化等一系列核心生物地球化学过程并相互依存或竞争的类群。虽然五大淡水湖泊在微生物群落组成上存在一定的生物地理学差异,但微生物群落在湿地生态系统中所发挥的功能方面联系紧密,更具整体性。
Microorganisms play a crucial role in biogeochemical cycling and energy flow in freshwater lake wetland ecosystems,and are important component for the maintenance of wetland ecosystem function.In this study,we analyzed soil bacterial and archaeal composition in the top-five largest freshwater lake wetlands in China,by 16S rRNA gene sequencing.The distance-decay relationship,redundancy analysis,Mantel test,variance partitioning analysis and co-occurrence analysis were used to investigate the variations of bacterial and archaeal community assembly and their co-occurrence.The results showed that under the co-driven geographical and climatic factors(site longitude and latitude,altitude,and mean annual precipitation)and soil physical and chemical factors(pH,total organic carbon,ammonium,and nitrate),the bacterial and archaeal communities of the five freshwater lake wetlands showed significant biogeographic distribution pattern.The dominant common species and the taxa structuring a modular co-occurrence network were those with the function of methanogenesis,methane oxidation,sulfate reduction,and nitrification,which are interdependent or competitive in the wetlands.Despite the biogeographic differences,soil microbial communities from the five largest freshwater lake wetlands harbored a tightly associated holistic network in their ecosystem functions.
作者
张杰
尚妍萌
谢钧宇
孟会生
郝鲜俊
孙大生
洪坚平
ZHANG Jie;SHANG Yan-meng;XIE Jun-yu;MENG Hui-sheng;HAO Xian-jun;SUN Da-sheng;HONG Jian-ping(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,Shanxi,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2020年第12期4131-4139,共9页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41907215)
山西省优秀博士来晋工作奖励资金科研项目(SXYBKY2018009)
山西农业大学科技创新基金项目(2018YJ24)资助。
关键词
淡水湖泊湿地
生物地理分布
距离衰减关系
共发生网络
freshwater lake wetland
biogeographic distribution
distance-decay relationship
co-occurrence network
