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Related Experiment Video

Updated: Sep 21, 2025

Simulating Impacts of Ice Storms on Forest Ecosystems

Simulating Impacts of Ice Storms on Forest Ecosystems

Published on: June 30, 2020

Thinning increases forest resiliency during unprecedented drought.

Temuulen Sankey¹, Julia Tatum²

¹School of Informatics, Computing, and Cyber Systems, Northern Arizona University, 1295 S. Knoles Drive, Flagstaff, AZ, 84011, USA. Temuulen.Sankey@nau.edu.

Scientific Reports

|May 31, 2022

Summary

Regional forest restoration thinning helps ponderosa pine forests endure severe drought. Thinned forests show reduced canopy temperatures and water stress, retaining more soil moisture during drought periods.

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Area of Science:

Forest ecology
Drought impact studies
Climate change adaptation

Background:

Widespread regional droughts are increasing, severely impacting western US ponderosa pine forests.
The ongoing North American megadrought presents unprecedented stress to these vital ecosystems.
Ponderosa pine forests cover over 56 million hectares in the western USA.

Purpose of the Study:

To assess the impact of the 2021 summer drought on ponderosa pine forest canopy temperature and carbon uptake.
To evaluate the effectiveness of regional forest restoration thinning in mitigating drought impacts.
To analyze soil moisture dynamics in thinned versus non-thinned forest stands during drought.

Main Methods:

Utilized unpiloted aerial vehicle (UAV) thermal imaging and ground-based hyperspectral data.
Monitored ponderosa pine forest canopy temperatures and inferred carbon uptake.
Employed an extensive soil moisture network to compare thinned and non-thinned stands.

Main Results:

Canopy temperatures in ponderosa pine forests increased up to 34.6°C during the 2021 drought, indicating a shift from carbon sink to source.
Thinned forests exhibited significantly lower increases in canopy temperature and reduced canopy water stress compared to non-thinned stands.
Thinned forests maintained significantly greater soil moisture at all measured depths (25, 50, 100 cm).

Conclusions:

Forest restoration thinning is a critical strategy for enhancing ponderosa pine forest resilience to severe drought.
Thinning practices amplify their benefits during extreme drought, improving water availability and reducing thermal stress.
Understanding these drought mitigation benefits is crucial for effective forest management in a changing climate.