Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

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

Title data

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. Vol. 33 (1996) Issue 1 . - pp. 1-23.
ISSN 1573-515X
DOI: https://doi.org/10.1007/BF00000967

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER6812
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: 24 Sep 2015 09:39
Last Modified: 24 Sep 2015 09:39
URI: https://eref.uni-bayreuth.de/id/eprint/19744