Arid
DOI10.3389/fmicb.2012.00358
Response of biological soil crust diazotrophs to season, altered summer precipitation, and year-round increased temperature in an arid grassland of the Colorado Plateau, USA
Yeager, Chris M.1; Kuske, Cheryl R.1; Carney, Travis D.1; Johnson, Shannon L.1; Ticknor, Lawrence O.2; Belnap, Jayne3
通讯作者Yeager, Chris M.
来源期刊FRONTIERS IN MICROBIOLOGY
ISSN1664-302X
出版年2012
卷号3
英文摘要

Biological soil crusts (biocrusts), which supply significant amounts of fixed nitrogen into terrestrial ecosystems worldwide (-33Tg y-1), are likely to respond to changes in temperature and precipitation associated with climate change. Using nifH gene-based surveys, we explored variation in the diazotrophic community of biocrusts of the Colorado Plateau, USA in response to season (autumn vs. spring), as well as field manipulations that increased the frequency of small volume precipitation events and year-round soil temperature. Abundance of nifH genes in biocrusts ranged from 3 x 106 to 1 x 108 g-1 soil, and nifH from heterocystous cyanobacteria closely related to Scytonema hyalinum, Spirirestis rafaelensis, and Nostoc commune comprised >98% of the total. Although there was no apparent seasonal effect on total nifH gene abundance in the biocrusts, T-RFLP analysis revealed a strong seasonal pattern in nifH composition. Spirirestis nifH abundance was estimated to oscillate 1 to >2 orders of magnitude between autumn (low) and spring (high). A yearround increase of soil temperature (2-3 C) had little effect on the diazotroph community structure over 2 years. Altered summer precipitation had little impact on diazotroph community structure over the first 1.5 years of the study, when natural background patterns across years and seasons superseded any treatment effects. However, after the second summer of treatments, nifH abundance was 2.6-fold lower in biocrusts receiving altered precipitation. Heterocystous cyanobacteria were apparently more resilient to altered precipitation than other cyanobacteria. The results demonstrate that diazotrophic community composition of biocrusts in this semi-arid grassland undergoes strong seasonal shifts and that the abundance of its dominant members decreased in response to more frequent, small volume precipitation events.


英文关键词biological soil crust nifH cyanobacteria climate change semi-arid altered precipitation nitrogen fixation Scytonema
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000208863600360
WOS关键词NITROGEN-FIXATION ; COMMUNITY STRUCTURE ; BACTERIAL DIVERSITY ; SUCCESSIONAL STAGES ; CRYPTOGAMIC CRUSTS ; TEMPORAL VARIATION ; GENE DIVERSITY ; DESERT CRUSTS ; LIQUID WATER ; CYANOBACTERIA
WOS类目Microbiology
WOS研究方向Microbiology
来源机构United States Geological Survey
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172431
作者单位1.Los Alamos Natl Lab, Div Biochem, Los Alamos, NM 87545 USA;
2.Los Alamos Natl Lab, Comp Computat & Stat Sci Div, Los Alamos, NM 87545 USA;
3.US Geol Survey, Southwest Biol Sci Ctr, Moab, UT USA
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GB/T 7714
Yeager, Chris M.,Kuske, Cheryl R.,Carney, Travis D.,et al. Response of biological soil crust diazotrophs to season, altered summer precipitation, and year-round increased temperature in an arid grassland of the Colorado Plateau, USA[J]. United States Geological Survey,2012,3.
APA Yeager, Chris M.,Kuske, Cheryl R.,Carney, Travis D.,Johnson, Shannon L.,Ticknor, Lawrence O.,&Belnap, Jayne.(2012).Response of biological soil crust diazotrophs to season, altered summer precipitation, and year-round increased temperature in an arid grassland of the Colorado Plateau, USA.FRONTIERS IN MICROBIOLOGY,3.
MLA Yeager, Chris M.,et al."Response of biological soil crust diazotrophs to season, altered summer precipitation, and year-round increased temperature in an arid grassland of the Colorado Plateau, USA".FRONTIERS IN MICROBIOLOGY 3(2012).
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