Climatic response of larch (Larix sp.) radial increment in provenances on the Krasnoyarsk forest-steppe
A. P. BARCHENKOV1,2, I. A. PETROV1,2,4, A. S. SHUSHPANOV1,3,4, A. S. GOLYUKOV1,2,4
1V. N. Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russia
2Siberian Federal University, Krasnoyarsk, Russia
3Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russia
4Tomsk State University, Tomsk, Russia
Keywords: larch, radial growth, provenances, climate change
Abstract
The article presents the results of a comparative analysis of the radial increment of various larch species and provenances growing on a common ecological background in experemental forestry established in 1965-1967 on the Krasnoyarsk forest-steppe territory by employees of the Sukachev Institute of Forest SB RAS. The provenances of Siberian larch (Larix sibirica Ledeb.) from different elevation belts of the Southern Siberian Mountains, Gmelin larch (L. gmelinii Rupr.) from the Trans-Baikal and Zeya provinces (Eastern Siberia), as well as Japanese larch (L. leptolepis Gord) introduced from Sakhalin Island were studied. Based on the cluster analysis of radial growth series, four groups of provenances were identified with different growth strategies depending on the response to environmental factors: mountain-forest-steppe and mountain-taiga provenances of Siberian larch; provenances of Gmelin larch from Transbaikalia. The provenance of Japanese larch from Sakhalin Island has formed a separate cluster. The highest values of radial growth were found in groups of mountain-forest-steppe provenances formed by Siberian larch and Gmelin larch trees introduced from East Siberian provinces. Low values of radial growth were noted in provenances of Siberian larch trees from Southern Siberia mountain-taiga zone and Japanese larch from the Sakhalin Island. Dendroclimatic analysis was used to identify the relationship between the environmental variables of the introduction zone and the radial increment of the studied provenances. In the Krasnoyarsk forest-steppe, the main factor limiting radial growth is the moisture content of the root layer in the middle of the growing season (July - August). Larch trees introduced from wetter habitats respond more strongly to an increase in water stress, while radial growth of trees taken from drier habitats responds positively to an increase in the length of the growing season.
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