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Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the...
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Quantifying deforestation and forest degradation with thermal response.

Hua Lin1, Yajun Chen1, Qinghai Song1

  • 1Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, Yunnan 666303, China.

The Science of the Total Environment
|July 23, 2017
PubMed
Summary

Mature forests act as superior thermal buffers, with their thermal response number (TRN) indicating forest health. A TRN below 75% of the optimal TRN signals significant disturbance, aiding early deforestation detection.

Keywords:
DisturbanceReforestationSuccessionSurface temperatureTemperature stability

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Area of Science:

  • Ecology
  • Environmental Science
  • Remote Sensing

Background:

  • Deforestation and forest degradation degrade resources and ecosystem services.
  • Operational indicators for forest status, especially degradation, are lacking.
  • Thermal properties offer potential for monitoring forest health.

Purpose of the Study:

  • To analyze the thermal response number (TRN) across various vegetation types.
  • To establish TRN as an indicator for forest degradation and deforestation.
  • To propose a method for early warning of forest status changes.

Main Methods:

  • Analysis of the thermal response number (TRN) at 163 sites.
  • TRN calculation: daily total net radiation divided by daily temperature range.
  • Comparison of TRN across mature forest, disturbed forest, planted forest, shrubland, grassland, savanna, and cropland.

Main Results:

  • TRN generally increased with latitude, with vegetation-specific regressions.
  • Mature forests exhibited significantly higher TRN, indicating superior thermal buffering.
  • A clear TRN boundary was observed between forests and non-forests (grassland, savanna), with shrubland overlapping.

Conclusions:

  • The thermal response number (TRN) is a valuable indicator for forest status.
  • Optimal TRN (TRNopt) from local mature forests can serve as a benchmark.
  • TRN thresholds (75% for disturbance, 66% for deforestation) can detect forest degradation and deforestation risks.