Species-and Age-Specific Growth Reactions to Extreme Droughts of the Keystone Tree Species across Forest-Steppe and Sub-Taiga Habitats of South Siberia
Belokopytova L.V. Zhirnova D.F. Krutovsky K.V. Mapitov N.B. Vaganov E.A. Babushkina E.A.
July 2022MDPI
Forests
2022#13Issue 7
Over the coming decades, climate change can decrease forest productivity and stability in many semiarid regions. Tree-ring width (TRW) analysis allows estimation of tree sensitivity to droughts, including resistance (Rt) and resilience (Rc) indexes. It helps to find adaptive potential of individual trees and forest populations. On a forest stand scale, it is affected by habitat conditions and species’ ecophysiological characteristics, and on individual scale by tree genotype, age, and size. This study investigated TRW response to droughts in forest-steppe and sub-taiga of southern Siberia for keystone species Scots pine (Pinus sylvestris L.), Siberian larch (Larix sibirica Ledeb.), and silver birch (Betula pendula Roth.). Chronologies reacted positively to the Standardized Precipita-tion-Evapotranspiration Index (SPEI) of the previous July–September and current April–July. De-pressed tree growth across region and droughts lasting over both intra-seasonal intervals were reg-istered in 1965, 1974, and 1999. TRW-based Rt and Rc for these droughts did not reveal age-or size-related patterns. Higher growth stability indexes were observed for birch in sub-taiga and for conifers in forest-steppe. Larch at all sites had disadvantage against pine for 1965 and 1999 droughts aggravated by pest outbreaks, but adapted better to drought in 1974. Site aridity affected both tree growth stability and intensity of climatic response.
age , drought sensitivity , habitat differences , resilience , resistance , tree rings
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Khakass Technical Institute, Siberian Federal University, Abakan, 655017, Russian Federation
Department of Forest Genetics and Forest Tree Breeding, Georg-August University of Göttingen, Göttingen, 37077, Germany
Center for Integrated Breeding Research (CiBreed), Georg-August University of Göttingen, Göttingen, 37075, Germany
Laboratory of Population Genetics, N. I. Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, 119333, Russian Federation
Laboratory of Forest Genomics, Genome Research and Education Center, Department of Genomics and Bioinformatics, Institute of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, 660036, Russian Federation
Scientific and Methodological Center, G. F. Morozov Voronezh State, University of Forestry and Technologies, Voronezh, 394036, Russian Federation
Department of Biology and Ecology, Toraighyrov University, Pavlodar, 140008, Kazakhstan
Institute of Ecology and Geography, Siberian Federal University, Krasnoyarsk, 660036, Russian Federation
Department of Dendroecology, V.N. Sukachev Institute of Forest, Siberian Branch of the Russian Academy of Science, Krasnoyarsk, 660036, Russian Federation
Khakass Technical Institute
Department of Forest Genetics and Forest Tree Breeding
Center for Integrated Breeding Research (CiBreed)
Laboratory of Population Genetics
Laboratory of Forest Genomics
Scientific and Methodological Center
Department of Biology and Ecology
Institute of Ecology and Geography
Department of Dendroecology
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