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Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Application of nitrogen fertilizer to a boreal pine forest has a negative impact on the respiration of ectomycorrhizal hyphae
Author(s): Vallack, Harry W
Leronni, Vincenzo
Metcalfe, Daniel B
Hogberg, Peter
Ineson, Phil
Subke, Jens-Arne
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Keywords: 13CO2
Pulse labelling
Soil CO2 efflux
Soil respiration
Boreal forest
Soil respiration
Forest ecology
Soil ecology
Soil chemistry
Issue Date: 2011
Date Deposited: 28-Oct-2011
Citation: Vallack HW, Leronni V, Metcalfe DB, Hogberg P, Ineson P & Subke J (2011) Application of nitrogen fertilizer to a boreal pine forest has a negative impact on the respiration of ectomycorrhizal hyphae. Plant and Soil, 352 (1/2), pp. 405-417.
Abstract: Aims: There is evidence that increased N inputs to boreal forests, via atmospheric deposition or intentional fertilization, may impact negatively on ectomycorrhizal (ECM) fungi leading to a reduced flux of plant- derived carbon (C) back to the atmosphere via ECM. Our aim was to investigate the impact of N fertilization of a Pinus sylvestris (L.) forest stand on the return of recently photoassimilated C via the ECM component of soil respiration. Methods: We used an in situ, large-scale, 13C-CO2 isotopic pulse labelling approach and monitored the 13C label return using soil gas efflux chambersplaced over three different types of soil collar to distinguish between heterotrophic (RH), autotrophic (RA; partitioned further into contributions from ECM hyphae and total RA) and total (RS) soil respiration. Results: The impact of N fertilization was to significantly reduce RA, particularly respiration via extramatrical ECM hyphae. ECM hyphal flux in control plots showed substantial spatial variability, resulting in mean flux estimates exceeding estimates of total RA, while ECM contributions to RA in N treated plots were estimated at around 30%. Conclusion: Significant impacts on soil C cycling may be caused by reduced plant C allocation to ECM fungi in response to increased N inputs to boreal forests; ecosystem models so far lack this detail.
DOI Link: 10.1007/s11104-011-1005-6
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