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Buchmann, Nina ; Gebauer, Gerhard ; Schulze, Ernst-Detlef:
Partitioning of 15N-labeled ammonium and nitrate among soil, litter, below- and above-ground biomass of trees and understory in a 15-year-old Picea abies plantation.
In: Biogeochemistry.
Bd. 33
(1996)
Heft 1
.
- S. 1-23.
ISSN 1573-515X
DOI: https://doi.org/10.1007/BF00000967
Abstract
The partitioning of nitrogen deposition among soil, litter, below- and above-ground biomass of trees and understory vegetation was investigated in a 15-year-old Picea abies (L.) Karst. plantation in the Fichtelgebirge, Germany, by labeling with 62 mg of 15N tracer per square meter in March 1991. Ammonium and nitrate depositions were simulated on five plots each, by labeling with either 15N-NH4+ or 15N-NO3-, and the 15N pulse was followed during two successive growing seasons (1991 and 1992). Total recovery rates of the 15N tracer in the entire stand ranged between 93 and 102% for both nitrogen forms in 1991, and 82% in June 1992. delta15N ratios increased rapidly in all compartments of the ecosystem. Roots and soils (to 65 cm depth) showed significant 15N enrichments for both 15N-treatments compared to reference plots. Newly grown spruce tissues were more enriched than older ones, but the most enriched delta15N values were found in the understory vegetation. Although spruce trees were a much larger pool (1860 g biomass/m2) than understory vegetation (Vaccinium myrtillus 333 g/m2, Calluna vulgaris 142 g/m2, Deschampsia flexuosa 22 g/m2), the ericaceous shrubs and the perennial grass were a much greater sink for the 15N label. Eight months after labeling, 9% of the ammonium and 15% of the nitrate label were found in the understory. P. abies retained only 3% of the 15N-ammonium and 7% of the 15N-nitrate. The main sink for both 15N tracers was the soil, where 87% of the ammonium and 79% of the nitrate tracer were found. The organic soil horizon (5-0 cm depth) contained 63% of the 15N-ammonium and 46% of the 15N-nitrate suggesting strong immobilization by microorganisms of both N forms. Eight months after tracer application, about 16% of both 15N-tracers was found below 25 cm soil depth. This 16% corresponds well to a 20% decrease in the recovery of both 15N tracers after 15 months and indicates a total loss out of the ecosystem. Highly enriched delta15N values were found in fruit bodies of fungi growing in reference plots (no N addition), although soils did not show increased delta15N ratios. No transfer of 15N-tracer between fungi and spruce or understory vegetation was apparent yet.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER6812 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzenökologie Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 24 Sep 2015 09:39 |
| Letzte Änderung: | 24 Sep 2015 09:39 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/19744 |