The below-ground perspective of forest plants: soil provides mainly organic nitrogen for plants and mycorrhizal fungi.

The New Phytologist
Erich Inselsbacher, Torgny Näsholm

Abstract

• Nitrogen (N) availability has a major impact on a wide range of biogeochemical processes in terrestrial ecosystems. Changes in N availability modify the capacity of plants to sequester carbon (C), but despite the crucial importance for our understanding of terrestrial ecosystems, the relative contribution of different N forms to plant N nutrition in the field is not known. Until now, reliably assessing the highly dynamic pool of plant-available N in soil microsites was virtually impossible, because of the lack of adequate sampling techniques. • For the first time we have applied a novel microdialysis technique for disturbance-free monitoring of diffusive fluxes of inorganic and organic N in 15 contrasting boreal forest soils in situ. • We found that amino acids accounted for 80% of the soil N supply, while ammonium and nitrate contributed only 10% each. In contrast to common soil extractions, microdialysis revealed that the majority of amino acids are available for plant and mycorrhizal uptake. • Our results suggest that the N supply of boreal forest soils is dominated by organic N as a major component of plant-available N and thus as a regulator of growth and C sequestration.

References

Feb 17, 2001·Nitric Oxide : Biology and Chemistry·K M MirandaD A Wink
Jan 19, 2008·Nature·Nicolas Gruber, James N Galloway
Feb 13, 2009·The New Phytologist·Torgny NäsholmUlrika Ganeteg

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Citations

Sep 12, 2012·The New Phytologist·Erik A Hobbie, Peter Högberg
Jun 4, 2014·The New Phytologist·Susanne SchmidtDoris Rentsch
Mar 27, 2015·Molecular Ecology·Stan D WullschlegerDavid J Weston
Jun 1, 2016·Plant, Cell & Environment·Oskar FranklinTorgny Näsholm
May 4, 2017·Ecological Applications : a Publication of the Ecological Society of America·Hyungwoo LimTorgny Näsholm
Oct 19, 2013·The New Phytologist·Olusegun Ayodeji OyewoleTorgny Näsholm
Oct 10, 2019·International Journal of Systematic and Evolutionary Microbiology·Wanatchaporn BoonthamNantana Srisuk
Nov 15, 2019·International Journal of Systematic and Evolutionary Microbiology·Abd El-Rahim M A El-SamawatyMohamed A Abdel-Wahab
Aug 23, 2018·Applications in Plant Sciences·Maria L KuzminaEvgeny V Zakharov
May 20, 2016·The New Phytologist·Michael WeißMarc-André Selosse
Apr 17, 2018·Tree Physiology·Min LiuXiaodong Yang
Aug 6, 2020·International Journal of Molecular Sciences·Üner Kolukisaoglu
Apr 4, 2017·Journal of Experimental Botany·Vanessa Castro-RodríguezFrancisco M Cánovas
Aug 6, 2019·Frontiers in Plant Science·Mélissande NagatiMonique Gardes
Jul 1, 2017·Mycoses·Marcela Guevara-SuarezJosé F Cano-Lira
Mar 5, 2021·The New Phytologist·Peter M HomyakJoshua P Schimel

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