摘要
[目的]本文旨在研究江苏盐城大丰地区碱蓬湿地、芦苇湿地、互花米草湿地、盐蒿湿地和原始光滩等5种滨海湿地生境土壤细菌群落组成结构特征,阐明不同滨海湿地生境对土壤细菌群落的调控作用及驱动机制,为滨海湿地资源合理开发与生物多样性保护提供指导意义。[方法]利用高通量测序技术对滨海湿地土壤细菌群落进行16S rRNA测序,利用微生物信息学方法对序列进行OTU(操作分类单元)聚类、物种注释、多样性指数、功能预测以及环境因子关联分析。[结果]土壤细菌群落中特有细菌OTU种类数从大到小依次为盐蒿湿地、芦苇湿地、互花米草湿地、碱蓬湿地、原始光滩地;土壤细菌群落多样性指数从高到低依次为芦苇湿地、盐蒿湿地、互花米草湿地、原始光滩地、碱蓬湿地。盐生细菌群落结构变化,一部分受到全钾(TK)与碳素耦合作用影响,另一部分受到Na+与钠吸附比的影响。土壤中Na+、钠吸附比(SAR)、土壤多酚氧化酶(PPO)活性、土壤碱性磷酸酶(AKP)活性、全氮(TN)等是驱动细菌群落结构变化的主要环境因子;NH+4-N、PPO和AKP三者形成偶联关系,共同影响土壤细菌群落的生物多样性。[结论]滨海湿地植被类型和主要环境因子在稳定土壤细菌群落结构及生物多样性方面起到关键作用。
[Objectives]Five kinds of wetlands in Dafeng,Yancheng,Jiangsu Province,including:Suaeda salsa wetland,Phragmites australis wetland,Spartina alterniflora wetland,Artemisia salina wetland and primordial beach,were studied on the soil bacterial community structure characteristics. The regulation and driving mechanism of different coastal wetland habitats on soil bacterial communities were elucidated to provide guidance for rational exploitation of coastal wetland resources and conservation of biodiversity. [Methods]High-throughput sequencing technology was used to sequence 16 S rRNA of soil bacterial communities,and micro-informatics methods were used to perform operational taxonomic units(OTU)clustering,species annotation,diversity index,functional prediction and environmental factors correlation analysis. [Results]In the soil bacterial communities,the number of proper bacteria OTU from large to small were Artemisia salina wetland,Phragmites australis wetland,Spartina alterniflora wetland,Suaeda salsa wetland,primordial beach. The diversity indices of soil bacterial community from high to low were Phragmites australis wetland,Artemisia salina wetland,Spartina alterniflora wetland,primordial beach,Suaeda salsa wetland. The community structure of the salt-tolerant bacteria changes,some of which were affected by the coupling of total potassium(TK)and carbon,and the other part of which was affected by Na+ and sodium adsorption ratio(SAR). The changes in bacterial community structure were mainly driven by environmental factors such as Na+,sodium adsorption ratio,soil polyphenol oxidase(PPO)activity,soil alkaline phosphatase(AKP)activity,and total nitrogen(TN). And the diversity of soil bacterial communities were influenced by the coupling relationship among NH+4-N,PPO activity and AKP activity. [Conclusions]Coastal wetland vegetation types and major environmental factors played a key role in stabilizing soil bacterial community structure and biodiversity.
作者
李秋霞
郭加汛
周晓辉
何也
刘叶楠
许斌
赵耕毛
LI Qiuxia;GUO Jiaxun;ZHOU Xiaohui;HE Ye;LIU Yenan;XU Bin;ZHAO Gengmao(College of Resources and Environmental Sciences/Jiangsu Provincial Key Laboratory of Marine Biology,Nanjing Agricultural University,Nanjing 210095,China)
出处
《南京农业大学学报》
CAS
CSCD
北大核心
2019年第6期1108-1117,共10页
Journal of Nanjing Agricultural University
基金
江苏省重点研发计划项目(BE2017337)
江苏省农业科技自主创新资金项目(CX[17]-1001)
关键词
沿海滩涂湿地
植被类型
土壤细菌群落
高通量测序
coastal beach wetland
vegetation types
soil bacterial community
high-throughput sequencing