Warming and neighbor removal affect white spruce seedling growth differently above and below treeline

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• 作者：Kyoko Okano ; M Syndonia Bret-Harte
• 关键词：Picea glauca ; Boreal forest ; Climate change ; Competition ; Subarctic ; Alaska
• 刊名：SpringerPlus
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：4
• 期：1
• 全文大小：2827KB
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• 作者单位：Kyoko Okano (1)
  M Syndonia Bret-Harte (1)
  
  1. Institute of Arctic Biology, University of Alaska, Fairbanks, Fairbanks, AK, USA
  
• 刊物类别：Science, general;
• 刊物主题：Science, general;
• 出版者：Springer International Publishing
• ISSN：2193-1801

文摘

Climate change is expected to be pronounced towards higher latitudes and altitudes. Warming triggers treeline and vegetation shifts, which may aggravate interspecific competition and affect biodiversity. This research tested the effects of a warming climate, habitat type, and neighboring plant competition on the establishment and growth of white spruce (Picea glauca (Moench) Voss) seedlings in a subarctic mountain region. P. glauca seedlings were planted in June 2010 under 4 different treatments (high/control temperatures, with/without competition) in 3 habitats (alpine ridge above treeline/tundra near treeline /forest below treeline habitats). After two growing seasons in 2011, growth, photosynthesis and foliar C and N data were obtained from a total of 156, one-and-a-half year old seedlings that had survived. Elevated temperatures increased growth and photosynthetic rates above and near treeline, but decreased them below treeline. Competition was increased by elevated temperatures in all habitat types. Our results suggest that increasing temperatures will have positive effects on the growth of P. glauca seedlings at the locations where P. glauca is expected to expand its habitat, but increasing temperatures may have negative effects on seedlings growing in mature forests. Due to interspecific competition, possibly belowground competition, the upslope expansion of treelines may not be as fast in the future as it was the last fifty years. Keywords Picea glauca Boreal forest Climate change Competition Subarctic Alaska