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¹⁵N-labelled ammonium and nitrate uptake by the grass "Calamagrostis villosa"

Title data

Koppisch, Doris ; Schulze, Ernst-Detlef ; Gebauer, Gerhard:
¹⁵N-labelled ammonium and nitrate uptake by the grass "Calamagrostis villosa".
In: Isotopes in Environmental and Health Studies. Vol. 29 (1993) Issue 1/2 . - pp. 77-84.
ISSN 1477-2639
DOI: https://doi.org/10.1080/10256019308046138

Abstract in another language

"Calamagrostis villosa" dominates the understory vegetation in declining spruce forests at higher elevations of the Central European mountain areas which show symptoms of needle yellowing and associated magnesium (Mg) deficiency. It was hypothesized that grasses would preferentially take up nitrate-nitrogen (NO3-N) over ammonium-nitrogen (NH4+-N) which would support the cation balance in Mg deficient soils. In order to test this hypothesis, growth experiments were carried out in the greenhouse using plants which were cultivated in sand for nine weeks with full nutrient solution containing 0.2 or 2 mmol of N with different NH4+ to NO3- ratios (1:0, 0.5:0.5, 0:1). In a short term experiment with labelled (NH4+)-15N and (NO3-)-15N, uptake of NH4+ and NO3- was measured. When NO3- was the only N source it was taken up at similar rate per g dry mass as in the experiment in which NH4+ was the only N source. However, at high supply pure NO3- nutrition resulted in higher biomass. In contrast, supply of only NH4+ caused accumulation of N in the roots but growth remained restricted. If NH4+ and NO3- were supplied at equal amounts, NH4+ was the preferred form for N uptake. Biomass of the plants with mixed supply did not differ from the plants with pure NO3- nutrition.The results point to an interesting interaction of carbon and nitrogen relation, but they do not support the initial hypothesis that grasses may prefer NO3- over NH4+.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER6732
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 12 Nov 2015 07:44
Last Modified: 12 Nov 2015 07:44
URI: https://eref.uni-bayreuth.de/id/eprint/22468