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Related Experiment Videos

Water use by forests, limits and controls.

Ian R. Calder1

  • 1Centre for Land Use and Water Resources Research, The University of Newcastle upon Tyne, NE1 7RU, U.K.

Tree Physiology
|March 26, 2003
PubMed
Summary

Forest water use varies by region and crop type, influenced by evaporation limits. Understanding these limits helps predict water consumption differences between forests and crops globally.

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Area of Science:

  • Hydrology
  • Forestry
  • Ecology

Background:

  • Forest water use is critical for water resource management.
  • Evaporation controls differ significantly between temperate and tropical, wet and dry regions.
  • Existing physical and physiological models for forest water use are not always practical.

Purpose of the Study:

  • To review global studies on forest water use compared to other crops.
  • To propose a new approach for estimating forest water use based on evaporation limits.
  • To develop adaptable models for predicting water use differences between forests and crops.

Main Methods:

  • Review of existing scientific literature on forest and crop water use.
  • Analysis of principal controls on evaporation in various climatic zones.
  • Development of evaporation-limits-based models of varying complexity.
  • Application of models to real-world water resource problems.

Main Results:

  • Evaporation controls on forests and crops vary markedly by region (temperate vs. tropical) and zone (wet vs. dry).
  • Key evaporation limits include radiation, advection, tree physiology, soil water, tree size, and drop size.
  • Evaporation-limits-based models offer practical solutions for forest water resource issues.

Conclusions:

  • A limits-based approach provides a flexible framework for estimating forest water use globally.
  • This method enhances predictions of water use disparities between forests and agricultural crops.
  • The findings are applicable to solving practical water resource challenges in diverse geographical contexts.

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