Тип публикации: статья из журнала
Год издания: 2023
Идентификатор DOI: 10.1007/s11629-022-7433-3
Ключевые слова: larch, siberian pine, Climate influence on tree radial growth, mountain forests, treeline, timberline, foreststeppe, drought stress, moisture stress, earth sciences, general, geography, environment, ecology
Аннотация: Climate-driven changes in the thermal and moisture regimes may variously influence different tree species growth and ranges. We hypothesize that drought resistant Siberian larch (Larix sibirica Ledeb.) and precipitation-sensitive Siberian pine (Pinus sibirica Du Tour) responded differently to climate change along the elevational thПоказать полностьюermal and precipitation gradients. We studied the influence of air temperature, precipitation, soil moisture, and atmospheric drought (indicated by the drought index SPEI) on larch and pine growth along the southward megaslope of the West Sayan Ridge. We found that since 2000 climate change resulted in increasing larch and pine radial growth index (GI) (c. 1.5–3 times) within treeline (2000–2300 m) and timberline (1900–2000 m) ecotones, i.e. within high precipitation zones. Within the forest-steppe ecotone (1100–1200 m) in which L. sibirica is the only species, larch GI stagnated or even decreased. The total forested area increased since 2000 up to +50% in the high elevations, whereas in the low elevations (<1400 m) area changes were negligible. Within treeline and timberline, trees’ GI was stimulated by summer temperature. Meanwhile, temperature increase in early spring reduces GI due to living tissue activation followed by tissue damage by desiccation. Within forest-steppe, larch radial growth was mostly dependent on soil moisture. Warming shifted dependence on moisture to the early dates of the growing period. Acute droughts decreased GI within forest-steppe as well as within treeline, whereas the drought influence on both species within highlands was insignificant. Within forest-steppe seedlings establishment was poor, whereas it was successful within treeline and timberline. Current climate change leads to stagnation or even decrease in Larix sibirica growth in the southern lowland habitat. In combination with poor seedlings establishment, reduced growth threatens the transformation of open lowland forests into forest-steppe and steppe communities. Meanwhile, in the highlands warming facilitated the growth of Siberian larch and pine and the increase of forested area.
Журнал: Journal of Mountain Science
Выпуск журнала: Т.20, №1
Номера страниц: 101-114
ISSN журнала: 16726316