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HERO ID
1858944
Reference Type
Journal Article
Title
Growth of mature boreal Norway spruce was not affected by elevated [CO2] and/or air temperature unless nutrient availability was improved
Author(s)
Sigurdsson, BD; Medhurst, JL; Wallin, G; Eggertsson, O; Linder, S
Year
2013
Is Peer Reviewed?
1
Journal
Tree Physiology
ISSN:
0829-318X
Volume
33
Issue
11
Page Numbers
1192-1205
Language
English
PMID
23878169
DOI
10.1093/treephys/tpt043
Web of Science Id
WOS:000328374500006
Abstract
The growth responses of mature Norway spruce (Picea abies (L.) Karst.) trees exposed to elevated [CO2] (CE; 670-700 ppm) 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.
Keywords
boreal forest; global climate change; nitrogen limitation; Picea abies
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