Tight Coupling Between Shoot Level Foliar N and P, Leaf Area, and Shoot Growth in Arctic Dwarf Shrubs Under Simulated Climate Change

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• 作者：Eva K. Koller ; Malcolm C. Press ; Terry V. Callaghan ; Gareth K. Phoenix
• 关键词：tundra ; nutrient dynamics ; climate change ; ecosystem function ; shoot growth ; plant productivity
• 刊名：Ecosystems
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：19
• 期：2
• 页码：326-338
• 全文大小：527 KB
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• 作者单位：Eva K. Koller (1)
  Malcolm C. Press (2)
  Terry V. Callaghan (1) (3) (4)
  Gareth K. Phoenix (1)
  
  1. Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK
  2. Manchester Metropolitan University, Manchester, M15 6BH, UK
  3. Royal Swedish Academy of Sciences, PO Box 50005, Stockholm, Sweden
  4. National Research Tomsk State University, 36, Lenin Ave., Tomsk, 634050, Russia
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Ecology
  Plant Sciences
  Zoology
  Environmental Management
  Geoecology and Natural Processes
  Nature Conservation
  
• 出版者：Springer New York
• ISSN：1435-0629

文摘

Nutrient availability limits productivity of arctic ecosystems, and this constraint means that the amount of nitrogen (N) in plant canopies is an exceptionally strong predictor of vegetation productivity. However, climate change is predicted to increase nutrient availability leading to increases in carbon sequestration and shifts in community structure to more productive species. Despite tight coupling of productivity with canopy nutrients at the vegetation scale, it remains unknown how species/shoot level foliar nutrients couple to growth, or how climate change may influence foliar nutrients–productivity relationships to drive changes in ecosystem carbon gain and community structure. We investigated the influence of climate change on arctic plant growth relationships to shoot level foliar N and phosphorus (P) in three dominant subarctic dwarf shrubs using an 18-year warming and nutrient addition experiment. We found a tight coupling between total leaf N and P per shoot, leaf area and shoot extension. Furthermore, a steeper shoot length-leaf N relationship in deciduous species (Vaccinium myrtillus and Vaccinium uliginosum) under warming manipulations suggests a greater capacity for nitrogen to stimulate growth under warmer conditions in these species. This mechanism may help drive the considerable increases in deciduous shrub cover observed already in some arctic regions. Overall, our work provides the first evidence at the shoot level of tight coupling between foliar N and P, leaf area and growth i.e. consistent across species, and provides mechanistic insight into how interspecific differences in alleviation of nutrient limitation will alter community structure and primary productivity in a warmer Arctic.