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Wirth, Christian ; Schulze, Ernst-Detlef ; Schulze, W. ; von Stünzner-Karbe, D. ; Ziegler, W. ; Miljukova, M. ; Sogachev, Andrey ; Varlagin, A. B. ; Panvyorov, M. ; Grigoriev, S. ; Kusnetzova, W. ; Siry, M. ; Hardes, G. ; Zimmermann, Reiner ; Vygodskaya, Natalja N.:
Above-ground biomass and structure of pristine Siberian Scots pine forests as controlled by competition and fire.
In: Oecologia.
Bd. 121
(1999)
Heft 1
.
- S. 66-80.
ISSN 1432-1939
DOI: https://doi.org/10.1007/s004420050908
Abstract
The study presents a data set of above-ground biomass (AGB), structure, spacing and fire regime, for 24 stand of pristine Siberian Scots pine (Pinus sylvestris) forests with lichens (n=20) or Vaccinium/mosses (n=4) as ground cover, along four chronosequences. The stands of the 'lichen' site type (LT) were stratified into three chronosequences according to stand density and fire history. Allometric equations were established from 90 sample trees for stem, coarse branch, fine branch, twig and needle biomass. The LT stands exhibited a low but sustained biomass accumulation until a stand age of 383 years. AGB reached only 6-10 kgdwm-2 after 200 years depending on stand density and fire history compared to 20 kgdwm-2 in the 'Vaccinium' type (VT) stands. Leaf area index (LAI) in the LT stands remained at 0.5-1.5 and crown cover was 30-60%, whereas LAI reached 2.5 and crown cover was >100% in the VT stands. Although nearest-neighbour analyses suggested the existence of density-dependent mortalilty, fire impact turned out to have a much stronger effect on density dynamics. Fire scar dating and calculation of mean and initial fire return intervals revealed that within the LT stands differences in structure and biomass were related to the severity of fire regimes, which in turn was related to the degree of landscape fragmentation by wetlands. Self-thinning analysis was used to define the local carrying capacity for biomass. A series of undisturbed LT stands was used to characterise the upper self-thinning boundary. Stands that had experienced a moderate fire regime were positioned well below the self-thinning boundary in a distinct fire-thinning band of reduced major axis regression slope -0.26. We discuss how this downward shift resulted from alternating phases of density reduction by fire and subsequent regrowth. We conclude that biomass in Siberian Scots pine forests is strongly influenced by fire and that climate change will affect ecosystems functions predominantly via changes in fire regimes.
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| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER7335 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Pflanzenökologie Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 11 Sep 2015 06:35 |
| Letzte Änderung: | 04 Jul 2016 13:51 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/19375 |