Trees

, Volume 28, Issue 1, pp 183–191

Increasing relevance of spring temperatures for Norway spruce trees in Davos, Switzerland, after the 1950s

  • Olga V. Churakova (Sidorova)
  • Werner Eugster
  • Sebastian Zielis
  • Paolo Cherubini
  • Sophia Etzold
  • Matthias Saurer
  • Rolf Siegwolf
  • Nina Buchmann
Original Paper

Abstract

Key message

Relevance of spring temperatures for tree-ring growth steadily increased since 1950s. Closely linked tree-ring growth and net CO2exchange driven by spring temperatures.

Abstract

We investigated long-term (over 100 years) tree-ring width (TRW) variabilities as well as short-term (10 years) variations in net ecosystem productivity (NEP) in response to climate to assess the driving factors for stem growth of Norway spruce in a subalpine forest at Davos in Switzerland. A tree-ring width index (TRWi) chronology for the period from 1750 to 2006 was constructed and linked with climate data from 1876 to 2006, and with NEP available for the period from 1997 to 2006. Based on TRWi, we found that only two out of the 257 years exhibited extreme negative TRWi, compared to 29 years with extreme positive anomalies, observed mainly in recent decades. Annual temperature, annual precipitation, as well as autumn and winter temperature signals were well preserved in the TRWi chronology over the last 130 years. Spring temperatures became increasingly relevant for TRWi, explaining less than 1 % of the variation in TRWi for the period from 1876 to 2006, but 8 % for the period from 1950 to 2006 (p = 0.032), and even 47 % for 1997–2006 (p = 0.028). We also observed a strong positive relationship between annual TRWi and annual NEP (r = 0.661; p = 0.037), both strongly related to spring temperatures (r = 0.687 and r = 0.678 for TRWi and NEP, respectively; p = 0.028; p = 0.032). Moreover, we found strong links between monthly NEP of March and annual TRWi (r = 0.912; p = 0.0001), both related to March temperatures (r = 0.767, p = 0.010 and r = 0.724, p = 0.018, respectively). Thus, under future climate warming, we expect stem growth of these subalpine trees and also ecosystem carbon (C) sequestration to increase, as long as water does not become a limiting factor.

Keywords

Norway spruce Tree-ring width Net ecosystem productivity Climate Subalpine forest 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Olga V. Churakova (Sidorova)
    • 1
    • 2
  • Werner Eugster
    • 2
  • Sebastian Zielis
    • 2
  • Paolo Cherubini
    • 4
  • Sophia Etzold
    • 4
  • Matthias Saurer
    • 3
  • Rolf Siegwolf
    • 3
  • Nina Buchmann
    • 2
  1. 1.V. N. Sukachev Institute of Forest SB RASKrasnoyarskRussia
  2. 2.Institute of Agricultural SciencesETH ZurichZürichSwitzerland
  3. 3.Paul Scherrer InstituteVilligenSwitzerland
  4. 4.WSL, Swiss Federal Institute for Forest, Snow and Landscape ResearchBirmensdorfSwitzerland

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