DOI: 10.1111/gcb.13030
论文题名: Experimental drought and heat can delay phenological development and reduce foliar and shoot growth in semiarid trees
作者: Adams H.D. ; Collins A.D. ; Briggs S.P. ; Vennetier M. ; Dickman L.T. ; Sevanto S.A. ; Garcia-Forner N. ; Powers H.H. ; Mcdowell N.G.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2015
卷: 21, 期: 11 起始页码: 4210
结束页码: 4220
语种: 英语
英文关键词: Climate change
; Juniper
; Juniperus monosperma
; Nonstructural carbohydrate
; Phenology
; Pinus edulis
; Piñon pine
; Water potential
Scopus关键词: carbohydrate
; climate change
; coniferous tree
; drought
; drought stress
; phenology
; semiarid region
; shoot growth
; soil water potential
; Coniferophyta
; Juniperus
; Juniperus monosperma
; Pinus edulis
; climate change
; drought
; growth, development and aging
; heat
; Juniperus
; New Mexico
; physiological stress
; physiology
; pine
; tree
; Climate Change
; Droughts
; Hot Temperature
; Juniperus
; New Mexico
; Pinus
; Stress, Physiological
; Trees
英文摘要: Higher temperatures associated with climate change are anticipated to trigger an earlier start to the growing season, which could increase the terrestrial C sink strength. Greater variability in the amount and timing of precipitation is also expected with higher temperatures, bringing increased drought stress to many ecosystems. We experimentally assessed the effects of higher temperature and drought on the foliar phenology and shoot growth of mature trees of two semiarid conifer species. We exposed field-grown trees to a ~45% reduction in precipitation with a rain-out structure ('drought'), a ~4.8 °C temperature increase with open-top chambers ('heat'), and a combination of both simultaneously ('drought + heat'). Over the 2013 growing season, drought, heat, and drought + heat treatments reduced shoot and needle growth in piñon pine (Pinus edulis) by ≥39%, while juniper (Juniperus monosperma) had low growth and little response to these treatments. Needle emergence on primary axis branches of piñon pine was delayed in heat, drought, and drought + heat treatments by 19-57 days, while secondary axis branches were less likely to produce needles in the heat treatment, and produced no needles at all in the drought + heat treatment. Growth of shoots and needles, and the timing of needle emergence correlated inversely with xylem water tension and positively with nonstructural carbohydrate concentrations. Our findings demonstrate the potential for delayed phenological development and reduced growth with higher temperatures and drought in tree species that are vulnerable to drought and reveal potential mechanistic links to physiological stress responses. Climate change projections of an earlier and longer growing season with higher temperatures, and consequent increases in terrestrial C sink strength, may be incorrect for regions where plants will face increased drought stress with climate change. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61919
Appears in Collections: 影响、适应和脆弱性
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作者单位: Earth and Environmental Sciences, Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM, United States; Irstea, UR Ecosystèmes Méditerranéens et Risques, Le Tholonet Aix-en-Provence, France; Centre de Recerca Ecològica i Aplicacions Forestals (CREAF), Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain
Recommended Citation:
Adams H.D.,Collins A.D.,Briggs S.P.,et al. Experimental drought and heat can delay phenological development and reduce foliar and shoot growth in semiarid trees[J]. Global Change Biology,2015-01-01,21(11)