TY  - JOUR
A1  - Wieczorek, Mareike
A1  - Kolmogorov, Alexei
A1  - Kruse, Stefan
A1  - Jacobsen, Inga
A1  - Nitze, Ingmar
A1  - Nikolaev, Anatoly N.
A1  - Heinrich, Ingo
A1  - Pestryakova, Luidmila Agafyevna
A1  - Herzschuh, Ulrike
T1  - Disturbance-effects on treeline larch-stands in the lower Kolyma River area (NE Siberia)
JF  - Silva Fennica : a quarterly journal for forest science
N2  - Tree stands in the boreal treeline ecotone are, in addition to climate change, impacted by disturbances such as fire, water-related disturbances and logging. We aim to understand how these disturbances affect growth, age structure, and spatial patterns of larch stands in the north-eastern Siberian treeline ecotone (lower Kolyma River region), an insufficiently researched region. Stand structure of Larix cajanderi Mayr was studied at seven sites impacted by disturbances. Maximum tree age ranged from 44 to 300 years. Young to medium-aged stands had, independent of disturbance type, the highest stand densities with over 4000 larch trees per ha. These sites also had the highest growth rates for tree height and stem diameter. Overall lowest stand densities were found in a polygonal field at the northern end of the study area, with larches growing in distinct " tree islands". At all sites, saplings are significantly clustered. Differences in fire severity led to contrasting stand structures with respect to tree, recruit, and overall stand densities. While a low severity fire resulted in low-density stands with high proportions of small and young larches, high severity fires resulted in high-density stands with high proportions of big trees. At waterdisturbed sites, stand structure varied between waterlogged and drained sites and latitude. These mixed effects of climate and disturbance make it difficult to predict future stand characteristics and the treeline position.
KW  - treeline
KW  - Larix cajanderi
KW  - Siberia
KW  - fire
KW  - stand structure
Y1  - 2017
U6  - https://doi.org/10.14214/sf.1666
SN  - 0037-5330
SN  - 2242-4075
VL  - 51
IS  - 3
PB  - The Finnish Society of Forest Science
CY  - Helsinki
ER  -