Are oxygen limitations under recognized regulators of organic carbon turnover in upland soils?
نویسندگان
چکیده
منابع مشابه
Role of large-scale soil structure in organic carbon turnover: Evidence from California grassland soils
[1] We characterized the effect of large-scale (>20 mm) soil physical structure on the age and recalcitrance of soil organic carbon (SOC) in upper (A) and lower (B) horizons of grassland soils from California’s Central Valley. The radiocarbon content of SOC from surfaces and interiors of large-scale soil structural units (‘‘peds’’) was measured in order to characterize the spatial distribution ...
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The loss of organic matter from soil is mainly the result of the clearing of forests for grassland or cropland. On the basis of the assumptions outlined here, the annual loss of organic carbon from the world's soils is between 2.5 x 1015g and 7.4 x 1015g, with 4.6 x 1015g being considered a realistic estimate. These amounts are 0.2, 0.5 and 0.3 per cent of the toial organic carbon (1477x 1015g)...
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Understanding global change impacts on the globally important carbon storage in alpine, Arctic and sub-Arctic soils requires knowledge of the mechanisms underlying the balance between plant primary productivity and decomposition. Given that nitrogen availability limits both processes, understanding the response of the soil nitrogen cycle to shifts in temperature and other global change factors ...
متن کاملControls over carbon storage and turnover in high-latitude soils
Despite the importance of Arctic and boreal regions in the present carbon cycle, estimates of annual high-latitude carbon ̄uxes vary in sign and magnitude. Without accurate estimates of current carbon ̄uxes from Arctic and boreal ecosystems, predicting the response of these systems to global change is daunting. A number of factors control carbon turnover in high-latitude soils, but because they...
متن کاملSequestered Organic Carbon Status in the Soils under Grassland in Uttarakhand State, India
Vegetative growth serves as an important means to capture and store atmospheric carbon dioxide in biomass and soil. Grassland soils are high in soil organic carbon and contain an extensive fibrous root system that creates an environment ideal for soil microbial activity. Accurate quantification of SOC pool is needed to generate benchmark information for the present and to determine the changes ...
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ژورنال
عنوان ژورنال: Biogeochemistry
سال: 2016
ISSN: 0168-2563,1573-515X
DOI: 10.1007/s10533-015-0180-6