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Toward a forest biomass reference measurement system for remote sensing applications.

Nicolas Labrière1, Stuart J Davies2, Mathias I Disney3,4

  • 1Evolution and Biological Diversity (EDB), CNRS/IRD/UPS, Toulouse, France.

Global Change Biology
|October 21, 2022
PubMed
Summary

A global forest biomass reference system is needed for validating Earth Observation data. While 200 sites offer good coverage, environmental representation plateaus, highlighting needs for improved geographical and structural data collection.

Keywords:
Earth Observationaboveground biomasscarbonforest vegetationpermanent plotsrepresentativenessvalidation

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Area of Science:

  • Earth Observation
  • Forestry Science
  • Climate Change Mitigation

Background:

  • Forests are crucial for climate mitigation via carbon storage, but their spatial and temporal carbon pool dynamics are poorly understood.
  • Earth Observation missions (e.g., GEDI, NISAR, BIOMASS) aim to quantify forest biomass, yet require independent validation.
  • A consistent, global, in situ forest biomass reference system using high-quality ground data is essential for mission product validation.

Approach:

  • Compiled a reference system of nearly 200 high-quality forest sites through literature review and expert consultation.
  • Assessed the representativeness of these sites against global forest environmental conditions, geographical distribution, and biomass-related structures.
  • Identified key sites for maximizing representativeness and pinpointed areas needing improved coverage.

Key Points:

  • Environmental coverage of the reference system stabilizes after including approximately 175 sites.
  • Geographical and structural coverage of forest biomass continues to improve with the addition of more sites.
  • Significant gaps in environmental, geographical, and structural coverage were identified in regions like Canada, the USA, Mexico, Russia, and various tropical highlands.

Conclusions:

  • The proposed forest biomass reference system requires standardized data collection and processing globally.
  • Equitable and inclusive system establishment, with attention to working conditions, is critical for success.
  • Mandatory training and involvement of site partners in downstream activities are necessary for system efficacy.