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  • Precipitation, not air temperature, drives functional responses of trees in semi-arid ecosystems [Elektronski vir]
    Grossiord, Charlotte ...
    Model scenarios of climate change predict that warming and d rought will occur simultaneouslyin the future in many regions. The capacity of woody species to modify their physiology and mor-phology in ... response to environmental conditions is widely recognized, but little is known about theresponses of trees to reduced precipitation and increased temperature acting simultaneously.2. In a semi-arid woodland, we asses sed the responses in physiological (needle emergence, maxi-mum photosynthesis, stomatal conductance, water use ef%ciency (WUE) and shoot elongation) andmorphological (needle length and thickness, and leaf mass per area (LMA)) foliar traits of pi~nonpine (Pinus edulis) in response to three years of a 45% reduction in precipitation, a 4.8 °C increasein air temperature and their simultaneous effects.3. A strong change in physiological and morphological traits in response to reduced precipitationwas observed. Precipitation reduction delayed needle emergence, decreased photosynthesis andstomatal conductance, increased WUE, decreased shoot elongation and induced shorter needles witha higher LMA. Trees subjected to simultaneous reductions in precipitation and warming demon-strated a similar response. However, atmospheric warming did not induce a response in any of themeasured traits.4. Physiological and morphological traits of trees in this semi-arid climate were more responsive tochanges in soil moisture than air temperature. Long-term exposure to seasonal drought stress in aridsites may have resulted in strong plastic responses to this %rst stre ssor. However, atmospheric warm-ing probably was not experienced as a stress for trees in this warm and dry climate. Overall, ourresults indicate that in semi-arid ecosystems where tree functioning is already highly limited by soilwater availability, atmospheric warming as anticipated with climate change may have less impact onfoliar trait responses than previously thought.
    Vir: Journal of ecology [Elektronski vir]. - ISSN 1365-2745 (Vol. 105, iss. 1, Jan. 2017, str. 163-175)
    Vrsta gradiva - e-članek
    Leto - 2017
    Jezik - angleški
    COBISS.SI-ID - 5023398

    Povezava(-e):

    http://onlinelibrary.wiley.com/doi/10.1111/1365-2745.12662/abstract
    DOI

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