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Boreal tree hydrodynamics: asynchronous, diverging, yet complementary.

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Boreal trees like larch and black spruce show different water use strategies. Their unique hydraulic behaviors help forests adapt to environmental stress and impact carbon dynamics.

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Area of Science:

  • Forest Ecology
  • Plant Physiology
  • Boreal Ecosystems

Background:

  • Increasing tree mortality in North America is linked to water stress.
  • Detailed analysis of boreal tree hydrodynamics and interspecific differences is lacking.

Purpose of the Study:

  • Examine hydraulic behavior of co-occurring larch (Larix laricina) and black spruce (Picea mariana).
  • Quantify tree hydraulic functioning and scrutinize water-use strategies.
  • Investigate interspecific differences near the southern boreal ecozone limit in Canada.

Main Methods:

  • Measured sap flux density (Js) and stem radius fluctuations.
  • Recorded concurrent meteorological conditions.
  • Analyzed diel hydrodynamics and stomatal regulation.

Main Results:

  • Observed asynchronous diel hydrodynamics: larch sap flux rose 2 hours earlier than black spruce.
  • Interspecific differences in crown architecture explained hydraulic asynchrony.
  • Larch exhibited isohydric behavior, while black spruce showed anisohydric behavior.

Conclusions:

  • Diverging hydrodynamics and stomatal strategies between larch and black spruce offer ecosystem-level complementarity.
  • Findings provide insights into boreal forest water and carbon dynamics.
  • Understanding these differences is crucial for boreal forest resilience to environmental stress.