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[Download Ebook.6f6d] Permafrost Soils (Soil Biology)

[Download Ebook.6f6d] Permafrost Soils (Soil Biology)

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Book Details :
Published on: 2008-12-08
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Original language: English

Most of the Earth’s biosphere is characterized by low temperatures. Vast areas (20%) of the soil ecosystem are permanently frozen or are unfrozen for only a few weeks in summer. Permafrost regions occur at high latitudes and also at high ele- tions; a significant part of the global permafrost area is represented by mountains. Permafrost soils are of global interest, since a significant increase in temperature is predicted for polar regions. Global warming will have a great impact on these soils, especially in northern regions, since they contain large amounts of organic carbon and act as carbon sinks, and a temperature increase will result in a release of carbon into the atmosphere. Additionally, the intensified release of the clima- relevant tracer gas methane represents a potential environmental harzard. Significant numbers of viable microorganisms, including bacteria, archaea, p- totrophic cyanobacteria and green algae, fungi and protozoa, are present in per- frost, and the characteristics of these microorganisms reflect the unique and extreme conditions of the permafrost environment. Remarkably, these microorg- isms have been reported to be metabolically active at subzero temperatures, even down to 20°C. Climate change and the permafrost carbon feedback : Nature ... Large quantities of organic carbon are stored in frozen soils (permafrost) within Arctic and sub-Arctic regions. A warming climate can induce environmental changes ... Study measures methane release from Arctic permafrost A University of Alaska Fairbanks-led research project has provided the first modern evidence of a landscape-level permafrost carbon feedback in which thawing ... Soil - Wikipedia Soil is a mixture of minerals organic matter gases liquids and countless organisms that together support life on Earth. Soil is a natural body called the ... Determinants of carbon release from the active layer and ... The chemistry of the aqueous soil extracts also differed between the two soil layers. Dissolved organic C (DOC) yield (mg C kg 1 OC) was greater from permafrost ... Archaeology Wordsmith Results for soil: (View exact match) anthropic soils CATEGORY: geology DEFINITION: Soils formed by or related to human activity. anthropogenic soil Peat - Wikipedia Peat (/ p i t /) also called turf (/ t r f /) is an accumulation of partially decayed vegetation or organic matter that is unique to natural areas called ... Global Change Biology - Wiley Online Library Global Change Biology exists to promote understanding of the interface between all aspects of current environmental change that affects a substantial part of the ... Soil - definition of soil by The Free Dictionary soil 1 (soil) n. 1. The top layer of the earth's surface in which plants can grow consisting of rock and mineral particles mixed with decayed organic matter and ... Soil Survey Manual - Chapter Three NRCS Soils - USDA Soil Survey Manual - Chapter Three Examination and Description of Soils. A description of the soils is essential in any soil survey. This chapter provides standards ... The temperature dependence of soil organic matter ... The temperature dependence of soil organic matter decomposition and the effect of global warming on soil organic C storage
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