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Mapping tree density at a global scale.

T W Crowther1, H B Glick1, K R Covey1

  • 1Yale School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut 06511, USA.

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|September 3, 2015
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Summary
This summary is machine-generated.

The global forest tree count is approximately 3.04 trillion, significantly higher than previous estimates. Deforestation has led to a 46% decline in tree numbers since human civilization began.

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Area of Science:

  • Ecology
  • Forestry
  • Environmental Science

Background:

  • Understanding forest tree distribution is crucial for global biosphere research.
  • Previous estimates of global tree numbers were significantly lower.

Purpose of the Study:

  • To create the first spatially continuous global map of forest tree density.
  • To provide an updated estimate of the total number of trees worldwide.

Main Methods:

  • Utilized a combination of ground-truthed data and spatial modeling.
  • Integrated data on climate, topography, and human impact.

Main Results:

  • Estimated global tree population at approximately 3.04 trillion.
  • Identified tropical and subtropical forests as having the highest tree density (1.39 trillion).
  • Found that human activity has drastically reduced global tree numbers by 46% since the start of civilization.

Conclusions:

  • Climate and topography influence tree density at local scales.
  • Human impact is the dominant factor affecting tree densities globally.
  • An estimated 15 billion trees are lost annually due to deforestation.