Arid
DOI10.1371/journal.pone.0066103
Factors Controlling Soil Microbial Biomass and Bacterial Diversity and Community Composition in a Cold Desert Ecosystem: Role of Geographic Scale
Van Horn, David J.1; Van Horn, M. Lee2; Barrett, John E.3; Gooseff, Michael N.4; Altrichter, Adam E.3; Geyer, Kevin M.3; Zeglin, Lydia H.5; Takacs-Vesbach, Cristina D.1
通讯作者Takacs-Vesbach, Cristina D.
来源期刊PLOS ONE
ISSN1932-6203
出版年2013
卷号8期号:6
英文摘要

Understanding controls over the distribution of soil bacteria is a fundamental step toward describing soil ecosystems, understanding their functional capabilities, and predicting their responses to environmental change. This study investigated the controls on the biomass, species richness, and community structure and composition of soil bacterial communities in the McMurdo Dry Valleys, Antarctica, at local and regional scales. The goals of the study were to describe the relationships between abiotic characteristics and soil bacteria in this unique, microbially dominated environment, and to test the scale dependence of these relationships in a low complexity ecosystem. Samples were collected from dry mineral soils associated with snow patches, which are a significant source of water in this desert environment, at six sites located in the major basins of the Taylor and Wright Valleys. Samples were analyzed for a suite of characteristics including soil moisture, pH, electrical conductivity, soil organic matter, major nutrients and ions, microbial biomass, 16 S rRNA gene richness, and bacterial community structure and composition. Snow patches created local biogeochemical gradients while inter-basin comparisons encompassed landscape scale gradients enabling comparisons of microbial controls at two distinct spatial scales. At the organic carbon rich, mesic, low elevation sites Acidobacteria and Actinobacteria were prevalent, while Firmicutes and Proteobacteria were dominant at the high elevation, low moisture and biomass sites. Microbial parameters were significantly related with soil water content and edaphic characteristics including soil pH, organic matter, and sulfate. However, the magnitude and even the direction of these relationships varied across basins and the application of mixed effects models revealed evidence of significant contextual effects at local and regional scales. The results highlight the importance of the geographic scale of sampling when determining the controls on soil microbial community characteristics.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000320576400053
WOS关键词MCMURDO DRY VALLEYS ; WRIGHT VALLEY ; TAYLOR VALLEY ; FUNGAL COMMUNITIES ; GLOBAL PATTERNS ; VICTORIA LAND ; BIODIVERSITY ; CLASSIFICATION ; BIOGEOCHEMISTRY ; GEOMORPHOLOGY
WOS类目Multidisciplinary Sciences
WOS研究方向Science & Technology - Other Topics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/179376
作者单位1.Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA;
2.Univ S Carolina, Dept Psychol, Columbia, SC 29208 USA;
3.Virginia Technol Inst, Dept Biol Sci, Blacksburg, VA USA;
4.Penn State Univ, Dept Civil & Environm Engn, University Pk, PA 16802 USA;
5.Oregon State Univ, Dept Crop & Soil Sci, Corvallis, OR 97331 USA
推荐引用方式
GB/T 7714
Van Horn, David J.,Van Horn, M. Lee,Barrett, John E.,et al. Factors Controlling Soil Microbial Biomass and Bacterial Diversity and Community Composition in a Cold Desert Ecosystem: Role of Geographic Scale[J],2013,8(6).
APA Van Horn, David J..,Van Horn, M. Lee.,Barrett, John E..,Gooseff, Michael N..,Altrichter, Adam E..,...&Takacs-Vesbach, Cristina D..(2013).Factors Controlling Soil Microbial Biomass and Bacterial Diversity and Community Composition in a Cold Desert Ecosystem: Role of Geographic Scale.PLOS ONE,8(6).
MLA Van Horn, David J.,et al."Factors Controlling Soil Microbial Biomass and Bacterial Diversity and Community Composition in a Cold Desert Ecosystem: Role of Geographic Scale".PLOS ONE 8.6(2013).
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