Measured and modelled source water delta O-18 based on tree-ring cellulose of larch and pine trees from the permafrost zone : научное издание | Научно-инновационный портал СФУ

Measured and modelled source water delta O-18 based on tree-ring cellulose of larch and pine trees from the permafrost zone : научное издание

Тип публикации: статья из журнала

Год издания: 2020

Идентификатор DOI: 10.3832/ifor3212-013

Ключевые слова: conifers, climate, drought, permafrost thaw depth, siberia, delta o-18 of source water, δ18 o of source waterthis work was supported by the russian science foundation (rsf) (19-14188000 28), eu-fp7 marie curie fellowship (eu- isotrec 235122, 909122). fj and sl ac knowledge support by the swiss national science foundation (# 200020_172476). we thank martin werner for providing the soil water and humidity δ18o data from the echam5-jsbach model.

Аннотация: To identify source water for trees growing on permafrost in Siberia, we applied mechanistic models that quantify physical and biochemical fractionation processes, leading to oxygen isotope variation (delta O-18) in plant organic matter. These models allowed us to investigate the influence of a variety of climatic factors on tree-ring cellulose from two dominant species: Larix cajanderi Mayr. from northeastern Yakutia (69 degrees 22' N, 148 degrees 25' E, similar to 250 m a.s.l.) and Pinus sylvestris L. from Central Yakutia (62 degrees 14' N, 129 degrees 37' E, similar to 220 m a.s.l.). The climate of the region is highly continental with short growing seasons, low amount of precipitation and these forest ecosystems are growing on permafrost, which in turn impact the water cycle and climate variation in the delta O-18 of source water. We compared outputs of the Land surface Processes and eXchanges (LPX-Bem v. 1.3), and Roden-Lin-Ehleringer (RLE) models for the common period from 1945 to 2004. Based on our findings, trees from northeastern and central Yakutia may have access to additional thawed permafrost water during dry summer periods. Owing to differences in the soil structure, active thaw soil depth and root systems of trees at two Siberian sites, Larix cajanderi Mayr. trees can access water not more than from 50 cm depth, in contrast to Pinus sylvestris L. in Central Yakutia which can acquire water from up to 80 cm soil depth. The results enhance our understanding of the growth and survival of the trees in this extreme environment. To identify source water for trees growing on permafrost in Siberia, we applied mechanistic models that quantify physical and biochemical fractionation pro-cesses, leading to oxygen isotope variation (δ18O) in plant organic matter. These models allowed us to investigate the influence of a variety of climatic factors on tree-ring cellulose from two dominant species: Larix cajanderi Mayr. from northeastern Yakutia (69° 22′ N, 148° 25′ E, ~ 250 m a.s.l.) and Pi-nus sylvestris L. from Central Yakutia (62°14′ N, 129°37′ E, ~ 220 m a.s.l.). The climate of the region is highly continental with short growing seasons, low amount of precipitation and these forest ecosystems are growing on per-mafrost, which in turn impact the water cycle and climate variation in the δ18O of source water. We compared outputs of the Land surface Processes and eX-changes (LPX-Bern v. 1.3), and Roden-Lin-Ehleringer (RLE) models for the com-mon period from 1945 to 2004. Based on our findings, trees from northeastern and central Yakutia may have access to additional thawed permafrost water during dry summer periods. Owing to differences in the soil structure, active thaw soil depth and root systems of trees at two Siberian sites, Larix cajan-deri Mayr. trees can access water not more than from 50 cm depth, in contrast to Pinus sylvestris L. in Central Yakutia which can acquire water from up to 80 cm soil depth. The results enhance our understanding of the growth and survival of the trees in this extreme environment. © SISEF.

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Издание

Журнал: IFOREST-BIOGEOSCIENCES AND FORESTRY

Выпуск журнала: Vol. 13

Номера страниц: 224-229

ISSN журнала: 19717458

Место издания: POTENZA

Издатель: SISEF-SOC ITALIANA SELVICOLTURA ECOL FORESTALE

Авторы

  • Churakova-Sidorova Olga (Siberian Fed Univ, Svobodniy Pr 79, RU-660041 Krasnoyarsk, Russia; Swiss Fed Inst Forest Snow & Landscape Res WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland)
  • Lienert Sebastian (Univ Bern, Climate & Environm Phys, Sidlerstr 5, CH-3012 Bern, Switzerland; Univ Bern, Oeschger Ctr Climate Change Res, Falkenpl 16, CH-3012 Bern, Switzerland)
  • Timofeeva Galina (Swiss Fed Inst Forest Snow & Landscape Res WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland)
  • Siegwolf Rolf (Swiss Fed Inst Forest Snow & Landscape Res WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland)
  • Roden John (Southern Oregon Univ, Biol Dept, Ashland, OR 97520 USA)
  • Joos Fortunat (Univ Bern, Climate & Environm Phys, Sidlerstr 5, CH-3012 Bern, Switzerland; Univ Bern, Oeschger Ctr Climate Change Res, Falkenpl 16, CH-3012 Bern, Switzerland)
  • Saurer Matthias (Swiss Fed Inst Forest Snow & Landscape Res WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland)

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