Introduction
Forests are natural carbon sinks. However, as reforestation of degraded land becomes a global climate solution, a persistent question lingers: How do we know how much carbon a forest is actually storing? Researchers say ground-based laser scanning, or LiDAR, could improve the efficiency of measuring the outcomes of reforestation.
The Role of LiDAR in Carbon Estimation
A recent paper published in Ecological Solutions and Evidence found that LiDAR scanning in Australia offered an improvement over other methods of carbon estimation. LiDAR instruments emit thousands of tiny laser pulses to create complex and intricate 3D maps of a forest’s structure, allowing researchers to more accurately estimate how much carbon is contained in its trees.
Alexander W. Cheesman, co-author of the paper and senior research fellow at James Cook University, North Queensland, Australia, calls the technology “transformative.” “Traditional field surveys heavily relied on manually measuring the height and diameter of a relatively small number of trees. But laser scanning captures the whole forest in 360 degrees, recording every stem, every branch and the shape of the canopy,” Cheesman told Mongabay during a virtual interview.
Carbon Accounting Model in Australia
In Australia, the Full Carbon Accounting Model (FullCAM) is the government’s main tool to track carbon stored in soil and roots (belowground carbon) and vegetation (aboveground carbon). It is used for national greenhouse gas reporting to the United Nations and to assess carbon credit within the country, through the government’s Australian Carbon Credit Unit (ACCU) Scheme.
Challenges and Perspectives
However, the use of LiDAR for carbon estimation is not without challenges. Questions about the credibility and accuracy of the data collected by this technology still linger. Additionally, the large-scale implementation of LiDAR for forest monitoring may be limited by factors such as cost and access to remote areas.
Despite these challenges, the potential of LiDAR to improve carbon estimates is significant. As the technology continues to evolve, it is likely that we will see a greater adoption of LiDAR in reforestation and carbon monitoring initiatives around the world.
Conclusion
Laser scanning of forests may be a powerful tool for improving carbon estimates and supporting reforestation efforts. However, it is crucial to address the credibility and accuracy issues associated with this technology. As we continue to seek solutions to the climate challenge, the adoption of innovative technologies like LiDAR can play a crucial role in promoting sustainable forest management practices.
Source / Reference: Mongabay