Сибирский федеральный университет

Тип публикации: статья из журнала (материалы конференций, опубликованные в журналах)

Конференция: Workshop on Current Status and the Potential of Tree-Ring Research in Russia; Krasnoyarsk, RUSSIA; Krasnoyarsk, RUSSIA

Год издания: 2016

Идентификатор DOI: 10.1016/j.dendro.2015.12.008

Ключевые слова: Northeastern Yakutia, Stable isotopes in tree-ring width, Permafrost, Thaw depth, Water source, Climate, Larix, Larix cajanderi

Аннотация: Tree-ring width and stable isotopic composition are widely used for the reconstruction of environmental conditions. Eco-physiological models simulating delta C-13 and delta O-18 provide tools to constrain the interpretation of measured tree-ring variations and their relationships to environmental variables. Here, we apply biochemical models of photosynthesis and a model of stomatal conductance to simulate the intra-annual dynamics of delta(13) C values in photo assimilates and tree-rings. We use these models to investigate the physiological responses of larch trees growing on permafrost to variability in precipitation and permafrost depth associated with regional temperature and precipitation changes. Tree-ring width, delta C-13 and delta O-18 in wood and cellulose were measured in larch (Larix cajanderi Mayr.) samples from northeastern Yakutia (69 degrees N, 148 degrees E) for the period from 1945 to 2004 and used for comparisons with modeled delta C-13 and delta O-18 data. Mechanistic models that quantify physical and biochemical fractionation processes leading to oxygen isotope variation in organic matter are used to identify source water for trees growing on permafrost in Siberia. These models allowed us to investigate the influence of a variety of climatic factors on Siberian forest ecosystem water relations that impact isotope fractionation. Based on delta C-13 and delta O-18 in tree wood and cellulose measurements as well as outputs from different eco-physiological models, we assume that larch trees from northeastern Yakutia can have limited access to the additional thawed permafrost water during dry summer periods. (C) 2015 Elsevier GmbH. All rights reserved.

Журнал: DENDROCHRONOLOGIA

Выпуск журнала: Vol. 39

Номера страниц: 51-59

ISSN журнала: 11257865

Место издания: JENA

Издатель: ELSEVIER GMBH, URBAN & FISCHER VERLAG

• Churakova Sidorova O.V. (Paul Scherrer Institute)
• Siegwolf R.T.W. (Paul Scherrer Institute)
• Saurer M. (Paul Scherrer Institute)
• Spahni R. (Climate and Environmental Physics,Physics Institute and Oeschger Centre for Climate Change Research,University of Bern)
• Roden J. (Southern Oregon University,Biology Department)
• Shashkin A.V. (V.N Sukachev Institute of Forest SB RAS)
• Bryukhanova M.V. (Siberian Federal University)
• Benkova A.V. (V.N Sukachev Institute of Forest SB RAS)
• Kuptsova A.V. (V.N Sukachev Institute of Forest SB RAS)
• Vaganov E.A. (Siberian Federal University)
• Launois T. (CEA Saclay-Laboratoire des Sciences du Climat et de l'Environnement,CEA Saclay)
• Peylin P. (CEA Saclay-Laboratoire des Sciences du Climat et de l'Environnement,CEA Saclay)
• Masson-Delmotte V. (CEA Saclay-Laboratoire des Sciences du Climat et de l'Environnement,CEA Saclay)

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