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15N-ammonium and 15N-nitrate uptake of a 15-year-old Picea abies plantation

Title data

Buchmann, Nina ; Schulze, Ernst-Detlef ; Gebauer, Gerhard:
15N-ammonium and 15N-nitrate uptake of a 15-year-old Picea abies plantation.
In: Oecologia. Vol. 102 (1995) Issue 3 . - pp. 361-370.
ISSN 1432-1939
DOI: https://doi.org/10.1007/BF00329803

Abstract in another language

Throughfall nitrogen of a 15-year-old Picea abies (L.) Karst. (Norway spruce) stand in the Fichtelgebirge, Germany, was labeled with either 15N-ammonium or 15N-nitrate and uptake of these two tracers was followed during two successive growing seasons (1991 and 1992). 15N-labeling (62 mg 15N m-2 under conditions of 1.5 g N m-2 atmospheric nitrogen deposition) did not increase N concentrations in plant tissues. The 15N recovery within the entire stand (including soils) was 94% +/- 6% of the applied 15N- ammonium tracer and 100% +/- 6% of the applied 15N- nitrate tracer during the Ist year of investigation. This decreased to 80% +/- 24% and 83% +/- 20%, respectively, during the 2nd year. After 11 days, the 15N tracer was detectable in 1-year-old spruce needles and leaves of understory species. After 1 month, tracer was detectable in needle litter fall. At the end of the first growing season, more than 50% of the 15N taken up by spruce was assimilated in needles, and more than 20% in twigs. The relative distribution of recovered tracer of both 15N-ammonium and 15N-nitrate was similar within the different foliage age classes (recent to ii-year-old) and other compartments of the trees. 15N enrichment generally decreased with increasing tissue age. Roots accounted for up to 20% of the recovered 15N in spruce; no enrichment could be detected in stem wood. Although 15N-ammonium and 15N-nitrate were applied in the same molar quantities ((NH4+)-15N:(NO3-)-15N =1:1), the tracers were diluted differently in the inorganic soil N pools ((NH4+)-15N/NH4+: (NO3-)-15N/NO3- = 1:9). Therefore the measured 15N amounts retained by the vegetation do not represent the actual fluxes of ammonium and nitrate in the soil solution. Use of the molar ammonium-to-nitrate ratio of 9:1 in the soil water extract to estimate 15N uptake from inorganic N pools resulted in a 2-4 times higher ammonium than nitrate uptake by P. abies.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER6789
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Sep 2015 06:35
Last Modified: 03 May 2016 10:29
URI: https://eref.uni-bayreuth.de/id/eprint/19403