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Growth of mature boreal Norway spruce was not affected by elevated [CO2] and/or air temperature unless nutrient availability was improved

journal contribution
posted on 2023-05-17, 23:03 authored by Sigurdsson, BD, Medhurst, JL, Wallin, G, Eggertsson, O, Linder, S
The growth responses of mature Norway spruce (Picea abies (L.) Karst.) trees exposed to elevated [CO2] (CE; 670-700ppm) and long-term optimized nutrient availability or elevated air temperature (TE; +3.9 °C) were studied in situ in northern Sweden in two 3 year field experiments using 12 whole-tree chambers in ca. 40-year-old forest. The first experiment (Exp. I) studied the interactions between CE and nutrient availability and the second (Exp. II) between CE and TE. It should be noted that only air temperature was elevated in Exp. II, while soil temperature was maintained close to ambient. In Exp. I, CE significantly increased the mean annual height increment, stem volume and biomass increment during the treatment period (25, 28, and 22%, respectively) when nutrients were supplied. There was, however, no significant positive CE effect found at the low natural nutrient availability. In Exp. II, which was conducted at the natural site fertility, neither CE nor TE significantly affected height or stem increment. It is concluded that the low nutrient availability (mainly nitrogen) in the boreal forests is likely to restrict their response to the continuous rise in [CO2] and/or TE.

History

Publication title

Tree Physiology

Volume

33

Issue

11

Pagination

1192-1205

ISSN

0829-318X

Department/School

College Office - College of Sciences and Engineering

Publisher

Oxford University Press

Place of publication

Oxford, UK

Rights statement

Copyright 2013 the authors

Repository Status

  • Restricted

Socio-economic Objectives

Native forests

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