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Title: Experimental drought and heat can delay phenological development and reduce foliar and shoot growth in semiarid trees

Journal Article · · Global Change Biology
DOI:https://doi.org/10.1111/gcb.13030· OSTI ID:1257861
 [1];  [1];  [1];  [2];  [1];  [1];  [3];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. UR Ecosystemes Mediterraneens et Risques, Le Tholonet Aix-en-Provence (France)
  3. Univ.t Autonoma de Barcelona, Cerdanyola del Valles (Spain)

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. Furthermore, 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.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1257861
Report Number(s):
LA-UR-15-22759
Journal Information:
Global Change Biology, Vol. 21, Issue 11; ISSN 1354-1013
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 87 works
Citation information provided by
Web of Science

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Cited By (26)

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Plant phenological sensitivity to climate change on the Tibetan Plateau and relative to other areas of the world journal January 2019
Unsaturation of vapour pressure inside leaves of two conifer species journal May 2018
Complex responses of spring vegetation growth to climate in a moisture-limited alpine meadow journal March 2016
Temperature response surfaces for mortality risk of tree species with future drought journal November 2017
Are Scots pine forest edges particularly prone to drought-induced mortality? journal January 2018
Mechanisms of a coniferous woodland persistence under drought and heat journal April 2019
Carbohydrate dynamics of three dominant species in a Chinese savanna under precipitation exclusion journal February 2018
Lack of acclimation of leaf area:sapwood area ratios in piñon pine and juniper in response to precipitation reduction and warming journal September 2018
Heat stress tolerance determines the survival and growth of introduced Canadian sugar maple in subtropical China journal September 2018
Differences in morphological and physiological plasticity in two species of first-year conifer seedlings exposed to drought result in distinct survivorship patterns journal June 2019
Precipitation, not air temperature, drives functional responses of trees in semi-arid ecosystems journal October 2016
Poor plant performance under simulated climate change is linked to mycorrhizal responses in a semi-arid shrubland journal November 2017
Altered leaf elemental composition with climate change is linked to reductions in photosynthesis, growth and survival in a semi‐arid shrubland journal August 2019
Warming combined with more extreme precipitation regimes modifies the water sources used by trees journal September 2016
Conifers depend on established roots during drought: results from a coupled model of carbon allocation and hydraulics journal August 2019
Tree water dynamics in a drying and warming world: Future tree water dynamics journal June 2017
Stem radial growth and water storage responses to heat and drought vary between conifers with differing hydraulic strategies: Semiarid conifers responses to drought and heat journal June 2018
Reductions in tree performance during hotter droughts are mitigated by shifts in nitrogen cycling: Mitigation of hotter droughts journal August 2018
Quantifying Drought Sensitivity of Mediterranean Climate Vegetation to Recent Warming: A Case Study in Southern California journal December 2019
Interannual variations in needle and sapwood traits of Pinus edulis branches under an experimental drought text January 2018
Experimental throughfall reduction barely affects soil carbon dynamics in a warm-temperate oak forest, central China journal November 2017
Impacts of the removal of shrubs on the physiological and biochemical characteristics of Syntrichia caninervis Mitt: in a temperate desert journal April 2017
Individual and interactive effects of drought and heat on leaf physiology of seedlings in an economically important crop journal December 2016
Xylem and Leaf Functional Adjustments to Drought in Pinus sylvestris and Quercus pyrenaica at Their Elevational Boundary journal July 2017
Long-Term Studies Reveal Differential Responses to Climate Change for Trees Under Soil- or Herbivore-Related Stress journal February 2019