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  Above-ground biomass and structure of pristine Siberian Scots pine forests as controlled by competition and fire

Wirth, C., Schulze, E.-D., Schulze, W., Von Stünzner-Karbe, D., Ziegler, W., Miljukova, I. M., et al. (1999). Above-ground biomass and structure of pristine Siberian Scots pine forests as controlled by competition and fire. Oecologia, 121(1), 66-80.

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Wirth, C.1, Author           
Schulze, E.-D.1, Author           
Schulze, W., Author
Von Stünzner-Karbe, D., Author
Ziegler, W.1, Author           
Miljukova, I. M., Author
Sogachev, A., Author
Varlagin, A. B., Author
Panvyorov, M., Author
Grigoriev, S., Author
Kusnetzova, W., Author
Siry, M.1, Author           
Hardes, G.1, Author           
Zimmermann, R., Author
Vygodskaya, N. N., Author
Affiliations:
1Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, ou_1497751              

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Free keywords: Pinus sylvestri Siberia Biomass Self-thinning Forest fire Self-thinning exponent Sylvestris stands Long-term Populations Needle Rule Plantations Evaporation Hypothesis Dynamics
 Abstract: The study presents a data set of above-ground biomass (AGB), structure, spacing and fire regime, for 24 stands 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. AGE reached only 6-10 kg(dw) m(-2) after 200 years depending on stand density and fire history compared to 20 kg(dw) m(-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 mortality, 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 ecosystem functions predominantly via changes in fire regimes. [References: 51]

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 Dates: 1999
 Publication Status: Issued
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 Identifiers: Other: BGC0199
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Title: Oecologia
Source Genre: Journal
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Publ. Info: Berlin : Springer-Verlag.
Pages: - Volume / Issue: 121 (1) Sequence Number: - Start / End Page: 66 - 80 Identifier: CoNE: https://pure.mpg.de/cone/journals/resource/1000000000265440
ISSN: 0029-8549