Increasing radial and latewood growth rates of Larix cajanderi Mayr. and Pinus sylvestris L. in the continuous permafros
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RESEARCH PAPER
Increasing radial and latewood growth rates of Larix cajanderi Mayr. and Pinus sylvestris L. in the continuous permafrost zone in Central Yakutia (Russia) Alberto Arzac 1 & Margarita Popkova 1 & Altynai Anarbekova 1 & José Miguel Olano 2 & Emilia Gutiérrez 3 & Anatoly Nikolaev 4,5 & Vladimir Shishov 1,6 Received: 15 April 2019 / Accepted: 27 August 2019 # INRA and Springer-Verlag France SAS, part of Springer Nature 2019
Abstract & Key message Annual radial growth and latewood formation increase during the period 1966–2015 in Larix cajanderi Mayr. and Pinus sylvestris L. along a latitudinal gradient on Siberian permafrost. Warmer temperatures and precipitation at the onset of the growth season favor growth in both species. & Context A vast area of Siberian boreal forest is covered by continuous permafrost, where tree radial growth is strongly limited by low temperatures. Understanding how climate controls Siberian conifer growth is critical in order to predict their response to ongoing climate change. & Aims To explore variations in the radial growth and earlywood/latewood formation of Pinus sylvestris L. and Larix cajanderi Mayr. trees along a climate gradient within the continuous permafrost zone in Central Yakutia (Russia), a region experiencing accelerated warming. & Methods We evaluated spatiotemporal differences in tree-ring and latewood width among sites by using generalized additive mixed models. Pearson’s correlations were used to analyze the effect of local climate (temperature, precipitation) and drought (SPEI) on the formation of earlywood and latewood. & Results Both conifers showed increased radial growth in recent decades. Radial growth was controlled by temperature and precipitation in both species along the gradient, with earlier precipitation events being critical for the formation of wide rings. & Conclusion Although temperature is considered as the main limiting factor triggering tree growth in the continuous permafrost zone, our results showed that water availability also plays a key role in radial tree growth even in the coldest sites. Keywords Central Yakutia . Climate . General additive mixed models . Pointer years . SPEI . Tree growth This article is part of the topical collection on Wood formation and tree adaptation to climate Handling Editor: Cyrille B. Rathgeber Contributions of the co-authors A. Arzac contributed to the project design, analyzed the data, and wrote the manuscript. M. Popkova, A. Anarbekova, and A. Arzac were responsible for RW, EW, and LW measurements and chronologies. JM Olano and E. Gutiérrez contributed to the interpretation of the results and helped in writing the manuscript. A. Nikolaev and V. Shishov were responsible for the field works. V. Shishov also contributed to the project design and funding acquisition. All the authors reviewed the paper. * Alberto Arzac [email protected] 1
2
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, Russia 660041 iuFOR-EiFAB, Universidad de Valladolid, 42004 Soria, Spain
3
Department of Evolutionary Bio
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