Theme: East-West Interdisciplinaty Boreal Forest Fire Experiment, Part 2 Moderator: J. G. Goldammer
Regularity of the Scots Pine Renewal Dynamics During Recovery of the Northern Taiga Pine Forests After Fires
Gorshkov, Vadim V., Stavrova, Natalie I.
Investigations were carried out in 5 regions in the Kola peninsula (between 67°40’68°00’N and 30°50’4°50’E) in pine forests of lichen site type (the share of lichens in the moss-lichen cover exceeding 80 %), burned 0, 57, 3040, 60, 90, 140150 and 210 years ago. Two most common extreme versions of post-fire damage in northern forest stands were analyzed:
I sample dead trees amount to less than 20 %,
II sample dead trees amount to more than 80 %.
The data were collected at 40 permanent sampling sites. The area of each site remained within 0.1 to 1 ha. Seedling density was determined in sample plots of 1 x 1 m (40 sample plots at each site), regularly positioned along the parallel profiles in 510 m from each other (the distance was constant within the site). Seedling density was studied according to three age groups:
1 less than 10 years,
2 1020 years,
3 more than 20 years.
The maximum value of overall regrowth density for the I sample is five to seven times higher than that of the II sample (1415 n/m2 and 23 n/m2 respectively), and observed 30 years earlier (at 30 [I] and 60 [II] years after fire). Stabilization of overall regrowth density coincides for both community samples, and is detected in the forests with fires dating back 120140 years.
During stabilization period the overall density of regrowth amounts to 0.10.6 trees/m2, with the ratio between regrowth and tree individuals ranging approximately between 10/1 and 4/1.
Indicated values agree with the corresponding numbers for boreal (both pine and spruce) climax forests of Russia with perturbations older than 200 years, and thus constitute fundamental indices.
Key words: fire, Scots pine forests, regrowth.
Correspondence: Vadim V. Gorshkov, Komarov Botanical Institute, Prof. Popov str., 2, RUS-St. Petersburg, 197376