文献类型：期刊文献

中文题名：互花米草入侵对盐城滨海湿地nirS型反硝化细菌多样性及群落结构的影响

英文题名：Effects of Spartina alterniflora Invasion on the Diversity and Community Structure of nirS-type Denitrifying Bacteria in Yancheng Coastal Wetlands

作者：刘志君[1,2] 崔丽娟[1,2] 李伟[1,2] 李晶[1,2] 雷茵茹[1,2] 朱怡诺[1,2] 王汝苗[1,2] 窦志国[1,2]

第一作者：刘志君

机构：[1]中国林业科学研究院湿地研究所,北京100091;[2]湿地生态功能与恢复北京市重点实验室,北京100091

年份：2022

卷号：31

期号：4

起止页码：704-714

中文期刊名：生态环境学报

外文期刊名：Ecology and Environmental Sciences

收录：CSTPCD;;北大核心:【北大核心2020】；CSCD:【CSCD2021_2022】；

基金：中国林业科学研究院基本科研业务费专项(CAFYBB2020QB008);国家重点研发计划项目(2017YFC0506200)。

语种：中文

中文关键词：nirS基因;细菌多样性;互花米草;滨海湿地

外文关键词：nirS gene;microbial diversity;Spartina alterniflora;coastal wetland

分类号：S154.1;X176

摘要：探明滨海湿地土壤反硝化细菌群落及多样性,对于理解滨海湿地氮素循环以及反硝化引起的N_(2)O排放等具有重要意义。采用时空替代法,选择盐城滨海湿地入侵3年、17年、31年的互花米草(Spartina alterniflora)群落,并以本土植物芦苇(Phragmites australis)群落作为对照,通过高通量测序技术分析不同土壤深度nirS型反硝化细菌群落组成及多样性,探讨互花米草入侵过程中滨海湿地土壤理化性质变化对nirS型反硝化细菌群落组成的影响。结果表明,入侵种互花米草导致盐城滨海湿地土壤反硝化细菌多样性较本地物种芦苇降低,且在不同土壤深度中反硝化细菌多样性均表现为随着入侵年限的增加先降低后上升的趋势。互花米草以及芦苇群落在不同土壤深度均存在特有反硝化细菌,其中嗜氢菌属(Hydrogenophilus)、色盐杆菌属(Chromohalobacter)、慢生根瘤菌属(Bradyrhizobium)相对丰度在不同土壤深度中均表现为随着入侵时间增加而增加。盐城滨海湿地土壤反硝化细菌结构变化同时受到多种环境因子的影响,在0—20 cm土壤深度主控因子为盐度、pH和总有机碳;在20—40 cm土壤深度主控因子为盐度、含水率、总有机碳、总碳。该研究可为深化研究滨海湿地互花米草入侵对反硝化功能细菌多样性及群落结构的影响提供重要科学依据。
Probing the soil denitrifying bacterial community and its diversity in coastal wetlands is of great significance for understanding the nitrogen cycle and N_(2)O emissions caused by denitrification.In this study,the spatio-temporal substitution method was adopted,the Spartina alterniflora community that had been invaded for 3 years,17 years,and 31 years in the coastal wetland of Yancheng were used as the research object,and the native plant Phragmites australis community was used as a control.High-throughput sequencing technology was used to reveal the composition and diversity of nirS-type denitrifying bacterial communities in different soil depths,and to analyze the influence of the physical and chemical properties of coastal wetland soil on the composition of nirS-type denitrifying bacteria community during the invasion of S.alterniflora.The results showed that the invasive species S.alterniflora led to a decrease in the stability of the soil bacterial community structure in coastal wetlands.As the number of years of invasion increased,the diversity of denitrifying bacteria showed a trend of first decreasing and then increasing,but it was always lower than the soil bacterial diversity of the native species of Phragmites australis communities;S.alterniflora and P.australis communities had unique denitrifying bacteria in different soil depths.Among them,the relative abundances of Hydrogenophilus,Chromohalobacter,and Bradyrhizobium were proportional to the number of years of invasion.The composition changes of soil denitrifying bacteria in Yancheng coastal wetland were also affected by many environmental factors,among which,salinity,pH,and water content were the main controlling factors that regulated the composition of soil denitrifying bacteria,followed by total carbon,total organic carbon,and nitrate nitrogen.This study can provide an important scientific basis for further examination of the impact of Spartina alterniflora invasion on the diversity and community structure of denitrifying bacteria in coastal wetlands.