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Differential drought tolerance in tree populations from contrasting elevations.

Fei Ma1, Ting Ting Xu2, Ming Fei Ji3

  • 1New Technology Application, Research and Development Center, Ningxia University, Yinchuan 750021, PR China.

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|November 13, 2014
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Summary

High-elevation Pinus tabuliformis populations show greater drought tolerance than low-elevation ones, exhibiting better growth and water use efficiency under water stress. This is crucial for predicting climate change impacts on this key Chinese tree species.

Keywords:
Carbon isotope compositionPinus tabuliformisdrought tolerancegrowthleaf gas exchangewater-use efficiency.

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Area of Science:

  • Plant ecophysiology
  • Climate change biology
  • Forest ecology

Background:

  • Understanding ecophysiological responses to water availability is vital for predicting climate change impacts on tree species.
  • Pinus tabuliformis is a significant tree species in China, necessitating research into its drought response.
  • Contrasting populations from different climates may exhibit varied adaptations to water stress.

Purpose of the Study:

  • To assess the ecophysiological responses of high-elevation (HP) and low-elevation (LP) Pinus tabuliformis populations to varying soil water availabilities.
  • To determine differences in drought tolerance between HP and LP populations.
  • To inform predictions of ecological consequences of climate change for Pinus tabuliformis.

Main Methods:

  • Greenhouse experiment exposing trees to four levels of soil water stress (80% to 20% field capacity).
  • Measurements included leaf gas exchange (photosynthesis, stomatal conductance), biomass production and allocation, water-use efficiency, and carbon isotope composition.
  • Comparison of responses between high-elevation and low-elevation populations.

Main Results:

  • Increasing water stress reduced growth rate, biomass, photosynthetic rate, stomatal conductance, and water use in both populations.
  • Intrinsic water-use efficiency and carbon isotope composition increased with water stress.
  • High-elevation populations exhibited less negative impacts from drought, showing higher relative growth rate, total dry mass, and whole-plant water-use efficiency compared to low-elevation populations.

Conclusions:

  • Pinus tabuliformis populations display differential responses to drought stress.
  • High-elevation populations demonstrate superior drought tolerance compared to low-elevation populations.
  • These findings highlight the importance of considering population origin in predicting species' responses to climate change-induced drought.