Responses of soil inhabiting nitrogen-cycling microbial communities to wetland degradation on the Zo

来源 :Journal of Mountain Science | 被引量 : 0次 | 上传用户:reich_ss
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The wetlands on the Zoige Plateau have experienced serious degradation,with most of the original marsh being converted to marsh meadow or meadow.Based on the 3 wetland degradation stages,we determined the effects of wetland degradation on the structure and relative abundance of nitrogencycling(nitrogen-fixing,ammonia-oxidizing,and denitrifying) microbial communities in 3 soil types(intact wetland:marsh soil;early degrading wetland:marsh meadow soil;and degraded wetland:meadow soil) using 454-pyrosequencing.The structure and relative abundance of nitrogen-cycling microbial communities differed in the 3 soil types.Proteobacteria was the predominant phylum in most soil samples but the most abundant soil nitrogenfixing and denitrifying microbial bacteria differed at the class,order,family,and genus levels among the 3soil types.At the genus level,the majority of nitrogenfixing bacterium sequences related to Bradyrhizobium were from marsh and marsh meadow soils;whereas those related to Geobacter originated from meadow soil.The majority of ammonia-oxidizing bacterium sequences related to Nitrosospira were from marsh(except for the 40-60 cm layer),marsh meadow and meadow soils;whereas those related to Candidatus Solibacter originated from 40-60 cm layer of marsh soil.The majority of denitrifying bacterium sequences related to Candidatus Solibacter and Anaeromyxobacter were from marsh and meadow soils;whereas those related to Herbaspirillum originated from meadow soil.The distribution of operational taxonomic units(OTUs)and species were correlated with soil type based upon Venn and Principal Coordinates Analysis(PCoA).Changes in soil type,caused by different water regimes were the most important factors influencing compositional changes in the nitrogen-fixing,ammonia-oxidizing,and denitrifying microbial communities. The wetlands on the Zoige Plateau have experienced serious degradation, with most of the original marsh being converted to marsh meadow or meadow. Based on the 3 wetland degradation stages, we determined the effects of wetland degradation on the structure and relative abundance of nitrogency cling (nitrogen -fixing, Ammonia-oxidizing, and denitrifying) microbial communities in 3 soil types (intact wetland: marsh soil; early degrading wetland: marsh meadow soil; and degraded wetland: meadow soil) using 454-pyrosequencing. The structure and relative abundance of nitrogen -cycling microbial communities differed in the 3 soil types. Proteobacteria was the predominant phylum in most soil samples but the most abundant soil nitrogen fixing and denitrifying microbial bacteria differed at the class, order, family, and genus levels among the 3soil types. At the genus level, the majority of nitrogenfixing bacterium sequences related to Bradyrhizobium were from marsh and marsh meadow soils; cter originated from meadow soil. the majority of ammonia-oxidizing bacterium sequences related to Nitrosospira were from marsh (except for the 40-60 cm layer), but those related to Candidatus Solibacter originated from 40-60 cm layer of marsh soil. majority of denitrifying bacterium sequences related to Candidatus Solibacter and Anaeromyxobacter were from marsh and meadow soils; but those related to Herbaspirillum originated from meadow soil. the distribution of operational taxonomic units (OTUs) and species were correlated with soil type based upon Venn and Principal Coordinates Analysis (PCoA) .Changes in soil type, caused by different water regimes were the most important factors influencing compositional changes in the nitrogen-fixing, Ammonia-oxidizing, and denitrifying microbial communities.
其他文献
阔步走向二十一世纪的中国邮政邮电部邮政总局局长盛名环邮政通信是社会的基础设施。当今世界,邮政通信产业的发展水平已成为衡量一个国家或地区经济发达程度的重要标志之一。
艰苦奋斗是中华民族的美德,也是我们党的优良传统,中国革命的胜利靠的是艰苦奋斗,在“一穷二白”的基础上建设新中国同样靠的是艰苦奋斗,因此,进行艰苦奋斗教育、培育艰苦奋
同在一片蓝天下,生活着这一群孩子,他们生活在一个无声的世界,但他们的心灵深处仍然渴望和正常孩子一样健康快乐地成长,分享明媚的阳光。普兰店市特殊教育学校里的老师们说:
我国实行的厂内经济核算制,与西方责任会计,既有相同的一面,又有不同的一面,现比较如下: 一、相同之处 1.都是在统一领导下,分级落实计划或预算指标。厂内经济核算制是实行
1996年4月26日下午,湖北省邮电审计知识竞赛总结表彰电视电话会议在武汉市电信局召开,大会授予襄樊、黄石、十堰、荆沙、随州、天门等邮电局,省邮政发行局、储汇局、设计院
结节病是一种原因未明的多系统肉芽肿性疾病 ,肺部浸润最为常见 ,也可侵及皮肤、眼、肝、脾、淋巴结、心脏及神经系统等肺外器官。现重点把结节病的肺部表现与诊治情况简要总
内蒙古建设厅会同建筑建材公路运输工会决定对全区在建工程施工现场的安全文明施工、工会劳动保护工作进行检查。这次检查的范围包括全区所有在建工程。自治区主要检查盟行
盛名环局长谈当前邮政工作重点5月20日,在石家庄召开的邮政干部培训指导委员会工作会议上,邮政总局盛名环局长就当前邮政工作重点谈了以厂三点意见。一、要抓住机遇,搞好基础设施建
机械通气 (ventilation)是利用呼吸机 (ventilator)为呼吸衰竭 (呼衰 )患者提供强制通气以代替或加强自主呼吸 ,增加通气量 ,扩张肺泡 ,改善通气 血流比例 ,减少呼吸运动功耗 ,达到纠正或缓解缺氧