Drought causes reduced growth of trembling aspen in western Canada. (25th January 2017)

• Record Type: Journal Article
• Authors: Chen, Lei; Huang, Jian‐Guo; Alam, Syed Ashraful; Zhai, Lihong; Dawson, Andria; Stadt, Kenneth J.; Comeau, Philip G.
• Is Part Of: Global change biology. Volume 23:Number 7(2017)
• Page Start: 2887
• Page End: 2902
• Publication Date: 2017-01-25
• Subjects: boreal forest -- drought -- radial growth -- spatial variation -- trembling aspen; Climatic changes -- Environmental aspects -- Periodicals; Troposphere -- Environmental aspects -- Periodicals; Biodiversity conservation -- Periodicals; Eutrophication -- Periodicals; 551.5
• DOI: 10.1111/gcb.13595
• Languages: English
• ISSNs: 1354-1013

Abstract

Abstract: Adequate and advance knowledge of the response of forest ecosystems to temperature‐induced drought is critical for a comprehensive understanding of the impacts of global climate change on forest ecosystem structure and function. Recent massive decline in aspen‐dominated forests and an increased aspen mortality in boreal forests have been associated with global warming, but it is still uncertain whether the decline and mortality are driven by drought. We used a series of ring‐width chronologies from 40 trembling aspen ( Populus tremuloides Michx.) sites along a latitudinal gradient (from 52° to 58°N) in western Canada, in an attempt to clarify the impacts of drought on aspen growth by using Standardized Precipitation Index (SPI) and Standardized Precipitation Evapotranspiration Index (SPEI). Results indicated that prolonged and large‐scale droughts had a strong negative impact on trembling aspen growth. Furthermore, the spatiotemporal variability of drought indices is useful for explaining the spatial heterogeneity in the radial growth of trembling aspen. Due to ongoing global warming and rising temperatures, it is likely that severer droughts with a higher frequency will occur in western Canada. As trembling aspen is sensitive to drought, we suggest that drought indices could be applied to monitor the potential effects of increased drought stress on aspen trees growth, achieve classification of eco‐regions and develop effective mitigation strategies to maintain western Canadian boreal forests. Abstract : Droughts are closely related to the reduced growth of trembling aspen in western Canadian boreal forests. Drought indices could be applied to monitor the potential effects of increased drought stress on aspen trees growth, achieving classification of eco‐regions and developing effective mitigation strategies to maintain western Canadian boreal forests.