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  • 1
    Journal cover
    Unknown
    Journal of Glaciology and Geocryology = Bingchuan-dongtu
    Zhongguo Dili Xuehui
    Online: 1.1979 –
    Print: 24.2002 – 40.2018 (Location: A43, AWI LZ 12 Unten)
    Details
    Publisher: Zhongguo Dili Xuehui
    Print ISSN: 1000-0240
    Topics: Biology , Geography , Geosciences
    Keywords: China ; Glaziologie ; Dauerfrostgebiet ; Permafrost
    Parallel titles: Bingchuan-dongtu
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    JOURNAL
  • 2
    Journal cover
    Unknown
    Ecological Applications
    Wiley-Blackwell | Ecological Society of America (ESA)
    Online: 7.1997 –
    Print: 1.1991 – 21.2011 (Location: A17, Kompaktmagazin, 18/6 - 19/1)
    Details
    Publisher: Wiley-Blackwell , Ecological Society of America (ESA)
    Corporation: Ecological Society of America, ESA
    Print ISSN: 1051-0761
    Electronic ISSN: 1939-5582
    Topics: Biology
    Keywords: Allgemeine Ökologie ; Landschaftsökologie ; Ökologie
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    JOURNAL
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  • 3
    Electronic Resource
    Electronic Resource
    Low-temperature recovery strategies for the isolation of bacteria from ancient permafrost sediments (2000)
    Springer
    Extremophiles 4 (2000), S. 165-173 
    Details
    ISSN: 1433-4909
    Keywords: Key words Arctic ; Permafrost ; Subsurface ; Microorganisms ; Psychrotolerant organism ; Low temperature ; Subzero
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Permafrost represents a unique ecosystem that has allowed the prolonged survival of certain bacterial lineages at subzero temperatures. To better understand the permafrost microbial community, it is important to identify isolation protocols that optimize the recovery of genetically diverse bacterial lineages. We have investigated the impact of different low-temperature isolation protocols on recovery of aerobic bacteria from northeast Siberian permafrost of variable geologic origin and frozen for 5000 to 3 million years. Low-nutrient media enhanced the quantitative recovery of bacteria, whereas the isolation of diverse morphotypes was maximized on rich media. Cold enrichments done directly in natural, undisturbed permafrost led not only to recovery of increased numbers of bacteria but also to isolation of genotypes not recovered by means of liquid low-temperature enrichments. On the other hand, direct plating and growth at 4°C also led to recovery of diverse genotypes, some of which were not recovered following enrichment. Strains recovered from different permafrost samples were predominantly oligotrophic and non-spore-forming but were otherwise variable from each other in terms of a number of bacteriological characteristics. Our data suggest that a combination of isolation protocols from different permafrost samples should be used to establish a culture-based survey of the different bacterial lineages in permafrost.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007920070031
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Environmental effects on CO2 efflux from riparian tundra in the northern foothills of the Brooks Range, Alaska, USA (1992)
    Springer
    Oecologia 92 (1992), S. 568-577 
    Details
    ISSN: 1432-1939
    Keywords: Arctic tundra ; Depth of thaw ; Ecosystem carbon exchange ; Permafrost ; Soil respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Carbon dioxide efflux and soil microenvironmental factors were measured diurnally in Carex aquatilus-and Eriophorum angustifolium-dominated riparian tundra communities to determine the relative importance of soil environmental factors controlling ecosystem carbon dioxide exchange with the atmosphere. Measurements were made weekly between 18 June and 24 July 1990. Diurnal patterns in carbon dioxide efflux were best explained by changes in soil temperature, while seasonal changes in efflux were correlated with changes in depth to water table, depth to frozen soil and soil moisture. Carbon dioxide efflux rates were lowest early in the growing season when high water tables and low soil temperatures limited microbial and root activity. Individual rainfall events that raised the water table were found to strongly reduce carbon dioxide efflux. As the growing season progressed, rainfall was low and depth to water table and soil temperatures increased. In response, carbon dioxide efflux increased strongly, attaining rates late in the season of approximately 10 g CO2 m−2 day−1. These rates are as high as maxima recorded for other arctic sites. A mathematical model is developed which demonstrates that soil temperature and depth to water table may be used as efficient predictors of ecosystem CO2 efflux in this habitat. In parallel with the field measurements of CO2 efflux, microbial respiration was studied in the laboratory as a function of temperature and water content. Estimates of microbial respiration per square meter under field conditions were made by adjusting for potential respiring soil volume as water table changed and using measured soil temperatures. The results indicate that the effect of these factors on microbial respiration may explain a large part of the diurnal and seasonal variation observed in CO2 efflux. As in coastal tundra sites, environmental changes that alter water table depth in riparian tundra communities will have large effects on ecosystem CO2 efflux and carbon balance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317851
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  • 5
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    Unknown
    Climate modellers take tropical approach (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-03-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tollefson, Jeff -- England -- Nature. 2015 Mar 26;519(7544):398-9. doi: 10.1038/519398a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25810183" target="_blank"〉PubMed〈/a〉
    Keywords: Arctic Regions ; Atmosphere/chemistry ; Carbon Dioxide/analysis/*metabolism ; *Forests ; Global Warming/*statistics & numerical data ; Human Activities ; *Models, Theoretical ; Permafrost ; Pilot Projects ; Plant Leaves/chemistry/metabolism ; Puerto Rico ; Soil/chemistry ; Trees/*growth & development/*metabolism ; *Tropical Climate ; United States
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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