Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/2561
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: The response of organic matter mineralisation to nutrient and substrate additions in sub-arctic soils
Authors: Hartley, Iain
Hopkins, David
Sommerkorn, Martin
Wookey, Philip
Contact Email: pw9@stir.ac.uk
Keywords: Arctic
Climate change
Glucose
Glycine
Mountain birch
Nitrogen
Phosphorus
Priming
Soil respiration
Tundra-heath
Issue Date: Jan-2010
Publisher: Elsevier
Citation: Hartley I, Hopkins D, Sommerkorn M & Wookey P (2010) The response of organic matter mineralisation to nutrient and substrate additions in sub-arctic soils, Soil Biology and Biochemistry, 42 (1), pp. 92-100.
Abstract: Global warming in the Arctic may alter decomposition rates in Arctic soils and therefore nutrient availability. In addition, changes in the length of the growing season may increase plant productivity and the rate of labile C input below ground. We carried out an experiment in which inorganic nutrients (NH4NO3 and NaPO4) and organic substrates (glucose and glycine) were added to soils sampled from across the mountain birch forest-tundra heath ecotone in northern Sweden (organic and mineral soils from the forest. and organic soil only from the heath). Carbon dioxide production was then monitored continuously over the following 19 days. Neither inorganic N nor P additions substantially affected soil respiration rates when added separately. However, combined N and P additions stimulated microbial activity, with the response being greatest in the birch forest mineral soil (57% increase in CO2 production compared with 26% in the heath soil and 8% in the birch forest organic soil). Therefore, mineralisation rates in these soils may be stimulated if the overall nutrient availability to microbes increases in response to global change, but N deposition alone is unlikely to enhance decomposition. Adding either, or both, glucose and glycine increased microbial respiration. Isotopic separation indicated that the mineralisation of native soil organic matter (SOM) was stimulated by glucose addition in the heath soil and the forest mineral soil, but not in the forest organic soil. These positive 'priming' effects were lost following N addition in forest mineral soil, and following both N and P additions in the heath soil. In order to meet enhanced microbial nutrient demand, increased inputs of labile C from plants could stimulate the mineralisation of SOM, with the soil C stocks in the tundra-heath potentially most vulnerable.
Type: Journal Article
URI: http://hdl.handle.net/1893/2561
DOI Link: http://dx.doi.org/10.1016/j.soilbio.2009.10.004
Rights: (C) 2009 Elsevier Ltd. All rights reserved; The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author; you can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Biological and Environmental Sciences
Biological and Environmental Sciences
Macaulay Land Use Research Institute
Biological and Environmental Sciences

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