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Boreal forest plants take up organic nitrogen
Örebro universitet, Institutionen för naturvetenskap.ORCID-id: 0000-0003-4384-5014
Vise andre og tillknytning
1998 (engelsk)Inngår i: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 392, nr 6679, s. 914-916Artikkel i tidsskrift, Letter (Annet (populærvitenskap, debatt, mm)) Published
Abstract [en]

Plant growth in the boreal forest, the largest terrestrial biome, is generally limited by the availability of nitrogen. The presumed cause of this limitation is slow mineralization of soil organic nitrogen1,2. Here we demonstrate, to our knowledge for the first time, the uptake of organic nitrogen in the field by the trees Pinus sylvestris and Picea abies, the dwarf shrub Vaccinium myrtillus and the grass Deschampsia flexuosa. These results show that these plants, irrespective of their different types of root–fungal associations (mycorrhiza), bypass nitrogen mineralization. A trace of the amino acid glycine, labelled with the stable isotopes 13C and 15N, was injected into the organic (mor) layer of an old successional boreal coniferous forest. Ratios of 13C:15N in the roots showed that at least 91, 64 and 42% of the nitrogen from the absorbed glycine was taken up in intact glycine by the dwarf shrub, the grass and the trees, respectively. Rates of glycine uptake were similar to those of 15N-ammonium. Our data indicate that organic nitrogen is important for these different plants, even when they are competing with each other and with non-symbiotic microorganisms. This has major implications for our understanding of the effects of nitrogen deposition, global warming and intensified forestry.

sted, utgiver, år, opplag, sider
1998. Vol. 392, nr 6679, s. 914-916
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Forskningsprogram
Biologi
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URN: urn:nbn:se:oru:diva-4246DOI: 10.1038/31921OAI: oai:DiVA.org:oru-4246DiVA, id: diva2:138545
Tilgjengelig fra: 2007-12-07 Laget: 2007-12-07 Sist oppdatert: 2017-12-14bibliografisk kontrollert

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Forlagets fullteksthttp://www.oru.se/oru-upload/Institutioner/Naturvetenskap/Dokument/%C4mnen/Biologi/N%E4sholmetal_1998_Nature.pdf

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