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Merryn G Smith1, Stefan K Arndt1, Rebecca E Miller1

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Area of Science:

  • Plant Physiology
  • Forest Ecology
  • Ecosystem Dynamics

Background:

  • Non-structural carbohydrates (NSCs) are vital for tree survival and regrowth after disturbances.
  • Epicormic resprouting, originating from the stem, may incur higher NSC costs than basal resprouting due to increased biomass maintenance.

Purpose of the Study:

  • To investigate NSC dynamics during epicormic versus basal resprouting in Eucalyptus obliqua.
  • To determine the relative contribution of stem and below-ground NSC reserves to resprouting.
  • To test hypotheses regarding NSC depletion patterns and carbohydrate types.

Main Methods:

  • Experimental crown or stem removal in 14-year-old Eucalyptus obliqua.
  • Harvesting trees over 10 months to assess NSC concentration and mass in stems, lignotubers, and roots.
  • Analysis of changes in starch and soluble sugar concentrations.

Main Results:

  • Starch was the predominant carbohydrate depleted during resprouting.
  • Stems served as a significant NSC source for epicormic resprouting.
  • Epicormic resprouting exhibited greater NSC reserve depletion than basal resprouting, particularly during the leafless period.
  • Roots were more critical for starch storage than lignotubers for both resprouting types.

Conclusions:

  • Tree resprouting strategies significantly impact NSC reserve utilization.
  • Stem NSC reserves play a crucial role in supporting epicormic regrowth.
  • Understanding NSC partitioning is essential for predicting tree resilience to disturbances.