DOI: 10.1111/gcb.12544
论文题名: Thermal acclimation of shoot respiration in an Arctic woody plant species subjected to 22 years of warming and altered nutrient supply
作者: Heskel M.A. ; Greaves H.E. ; Turnbull M.H. ; O'Sullivan O.S. ; Shaver G.R. ; Griffin K.L. ; Atkin O.K.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 8 起始页码: 2618
结束页码: 2630
语种: 英语
英文关键词: Arctic tundra
; Betula nana
; Nitrogen
; Phosphorus
; Stems
Scopus关键词: acclimation
; arctic environment
; carbon cycle
; global warming
; nitrogen
; nutrient availability
; phosphorus
; respiration
; shoot
; soil nutrient
; tundra
; woody plant
; Alaska
; Toolik Lake
; United States
; Betula nana
; nitrogen
; phosphorus
; acclimatization
; anatomy and histology
; Arctic
; birch
; cell respiration
; climate change
; growth, development and aging
; metabolism
; plant
; plant leaf
; plant stem
; temperature
; United States
; Acclimatization
; Alaska
; Arctic Regions
; Betula
; Cell Respiration
; Climate Change
; Nitrogen
; Phosphorus
; Plant Leaves
; Plant Shoots
; Plant Stems
; Temperature
英文摘要: Despite concern about the status of carbon (C) in the Arctic tundra, there is currently little information on how plant respiration varies in response to environmental change in this region. We quantified the impact of long-term nitrogen (N) and phosphorus (P) treatments and greenhouse warming on the short-term temperature (T) response and sensitivity of leaf respiration (R), the high-T threshold of R, and associated traits in shoots of the Arctic shrub Betula nana in experimental plots at Toolik Lake, Alaska. Respiration only acclimated to greenhouse warming in plots provided with both N and P (resulting in a ~30% reduction in carbon efflux in shoots measured at 10 and 20 °C), suggesting a nutrient dependence of metabolic adjustment. Neither greenhouse nor N+P treatments impacted on the respiratory sensitivity to T (Q10); overall, Q10 values decreased with increasing measuring T, from ~3.0 at 5 °C to ~1.5 at 35 °C. New high-resolution measurements of R across a range of measuring Ts (25-70 °C) yielded insights into the T at which maximal rates of R occurred (Tmax). Although growth temperature did not affect Tmax, N+P fertilization increased Tmax values ~5 °C, from 53 to 58 °C. N+P fertilized shoots exhibited greater rates of R than nonfertilized shoots, with this effect diminishing under greenhouse warming. Collectively, our results highlight the nutrient dependence of thermal acclimation of leaf R in B. nana, suggesting that the metabolic efficiency allowed via thermal acclimation may be impaired at current levels of soil nutrient availability. This finding has important implications for predicting carbon fluxes in Arctic ecosystems, particularly if soil N and P become more abundant in the future as the tundra warms. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62144
Appears in Collections: 影响、适应和脆弱性
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作者单位: Research School of Biology, Division of Plant Sciences, Australian National University, Building 46, Canberra, ACT 0200, Australia; Department of Forest, Rangeland, and Fire Sciences, University of Idaho, Moscow, Idaho, 83844-1135, United States; School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, Canterbury, 8140, New Zealand; The Ecosystems Center, Marine Biological Laboratory, Woods Hole, Falmouth, MA, 02543, United States; Earth and Environmental Sciences, Columbia University, Lamont-Doherty Earth Observatory of Columbia University, 61 Route 9W, 6 Biology, Palisades, NY, 10964, United States
Recommended Citation:
Heskel M.A.,Greaves H.E.,Turnbull M.H.,et al. Thermal acclimation of shoot respiration in an Arctic woody plant species subjected to 22 years of warming and altered nutrient supply[J]. Global Change Biology,2014-01-01,20(8)