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Storage and turnover of carbon in grassland soils along an elevation gradient in the Swiss Alps
JournalArticle (Originalarbeit in einer wissenschaftlichen Zeitschrift)
ID 69376
Author(s) Leifeld, Jens; Zimmermann, Michael; Fuhrer, Juerg; Conen, Franz
Author(s) at UniBasel Conen, Franz
Year 2009
Title Storage and turnover of carbon in grassland soils along an elevation gradient in the Swiss Alps
Journal Global change biology
Volume 15
Number 3
Pages / Article-Number 668-679
Keywords global warming, grassland, NaOCl, radiocarbon, RothC, soil carbon turnover, soil fractionation
Abstract Amount, composition, and rate of turnover of soil organic carbon (SOC) in mountainous cold regions is largely unknown, making predictions of future responses of this carbon (C) to changing environmental conditions uncertain. We hypothesized increasing amounts and declining turnover times of soil organic matter (SOM) under permanent grassland with increasing elevation and decreasing temperature. Samples from an irrigated transect in the Swiss Alps (880 to 2200m elevation, mean annual temperatures +8.9 to +0.9 degrees C) were analyzed. Soil C stocks ranged from 49 to 96 t Cha(-1) (0-20 cm) and were not related to elevation, though the highest site stored least C. Particulate organic carbon (POC) increased significantly with elevation and accounted for >80% of the total soil C at 2200m (0-5 cm). Mean residence times (MRTs) of POC computed by means of radiocarbon dating were in the order of years to decades and were positively related to elevation in the topsoil. At higher elevations, the estimated total C flux through the soil profile mainly depended on this fraction. MRT of mineral-associated matter ranged from decades to centuries and was not systematically related to elevation, but positively related to the soil mineral surface area and it increased with soil depth. Turnover rates from simulations with the soil C model RothC exceeded those from (14)C measurements by a factor of 1.7-3.3 which suggests that C dynamics at these sites is overestimated by the model. Size of model pools and amount of C in soil fractions were only weakly correlated, thereby challenging previously postulated hypotheses concerning the correspondence of pools and fractions for grasslands at higher elevations.
Publisher Blackwell Science
ISSN/ISBN 1354-1013
Full Text on edoc No
Digital Object Identifier DOI 10.1111/j.1365-2486.2008.01782.x
ISI-Number WOS:000263134600011
Document type (ISI) Article

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