Larch growth across thermal and moisture gradients in the Siberian Mountains  

作　　者：KHARUK Viacheslav I. PETROV Il'ya A. GOLYUKOV Alexey S. DVINSKAYA Maria L. IM Sergei T. SHUSHPANOV Alexander S. 

机构地区：[1]Sukachev Institute of Forest,Federal Scientific Center,Russian Academy of Science,Siberian Branch,Academgorodok 50/28,Krasnoyarsk,660036,Russia [2]Siberian Federal University,Svobodny str.79,Krasnoyarsk,660041,Russia [3]Reshetnev Siberian State University of Science and Technology,Krasnoyarsky rabochy str.31,Krasnoyarsk,660014,Russia [4]Tomsk State University,Lenina str.36,Tomsk,634050,Russia

出　　处：《Journal of Mountain Science》2023年第1期101-114,共14页山地科学学报（英文）

基　　金：The Tomsk State University Development Program《Priority-2030》supported this study。

摘　　要：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 thermal 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.1.5–3times)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 lar

关 键 词：LARCH Siberian pine Climate influence on tree radial growth Mountain forests TREELINE TIMBERLINE Foreststeppe Drought stress Moisture stress 

分 类 号：S71[农业科学—林学]