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Oyewole, OA; Inselsbacher, E; Nashohn, T; Jamtgard, S.
(2017): Incorporating mass flow strongly promotes N flux rates in boreal forest soils
SOIL BIOL BIOCHEM. 2017; 114: 263-269. FullText FullText_BOKU

Abstract:
Large differences in productivity and species composition are characteristic for the boreal forest and nitrogen (N) availability has been deemed the proximate cause of this variation. We used a modified microdialysis technique to assess N availability through monitoring in situ inorganic and organic soil N fluxes in the presence and absence of mass flow in two forest ecosystems of contrasting fertility, a nutrient rich Norway spruce forest and a nutrient poor Scots pine forest. This was enabled by using solutions of different osmotic potentials as perfusates. In the absence of mass flow, amino acids dominated soil N fluxes of both ecosystems representing 62 and 82% of total flux in the nutrient rich and the nutrient poor ecosystem respectively. In the presence of mass flow, N flux increased by nine times in the nutrient rich and four times in the nutrient poor soil and nitrate comprised a greater share of total N flux. Our results suggest that mass flow may be a strong driver for plant N acquisition in boreal forests through delivering higher amounts of amino acids and NOT to plant roots and mycorrhizas. These results points to a strong interaction between water and N availabilities, the former enhancing the supply of the latter through enabling high rates of transpiration. (C) 2017 The Authors. Published by Elsevier Ltd.
Authors BOKU Wien:
Inselsbacher Erich
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Find related publications in this database (Keywords)
Amino acids
Boreal forest
Diffusion
Mass flow
Microdialysis
Plant nutrition


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