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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1111/nph.12553
|2 doi
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|a pubmed25n0772.xml
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|e rakwb
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|a eng
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|a Oyewole, Olusegun Ayodeji
|e verfasserin
|4 aut
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|a Direct estimation of mass flow and diffusion of nitrogen compounds in solution and soil
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 01.09.2014
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|a Date Revised 09.01.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2013 The Authors. New Phytologist © 2013 New Phytologist Trust.
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|a Plant nutrient uptake from soil is mainly governed by diffusion and transpirationally induced mass flow, but the current methods for assessing the relative importance of these processes are indirect. We developed a microdialysis method using solutions of different osmotic potentials as perfusates to simulate diffusion and mass flow processes, and assessed how induced mass flow affected fluxes of nitrogen (N) compounds in solution and in boreal forest soil. Varying the osmotic potential of perfusates induced vertical fluxes in the direction of the dialysis membranes at rates of between 1 × 10(-8) and 3 × 10(-7) m s(-1) , thus covering the estimated range of water velocities perpendicular to root surfaces and induced by transpiration. Mass flow increased N fluxes in solution but even more so in soil. This effect was explained by an indirect effect of mass flow on rates of diffusive fluxes, possibly caused by the formation of steeper gradients in concentrations of N compounds from membrane surfaces out in the soil. Our results suggest that transpiration may be an essential driver of plant N acquisition
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Dextran 40
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|a amino acids
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|a diffusion
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|a mass flow
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|a microdialysis
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|a nutrient availability
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|a osmotic potential
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|a transpiration
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|a Nitrogen Compounds
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|a Soil
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|a Solutions
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|a Inselsbacher, Erich
|e verfasserin
|4 aut
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|a Näsholm, Torgny
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1990
|g 201(2014), 3 vom: 04. Feb., Seite 1056-1064
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|x 1469-8137
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|g year:2014
|g number:3
|g day:04
|g month:02
|g pages:1056-1064
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|u http://dx.doi.org/10.1111/nph.12553
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