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Nakaji Lab
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A lab that uses drones, satellites, and spectral imaging to study how forest trees function.
AboutAbout the lab
Remote sensing and non-destructive plant diagnostics
The Nakaji Lab studies forest remote sensing and techniques for examining plant function without damaging the plants.
Images taken from drones, aircraft, and satellites show, over wide areas, how forest trees respond to environmental stress.
Using laser scanners to measure forest structure and spectral imaging to measure leaf properties in the field, the lab develops techniques for understanding and monitoring ecosystem function.
The lab welcomes students who wish to go on to graduate school.
Key terms
- Remote sensing
- A technique for examining the state of an object from a distance by measuring light from drones, aircraft, satellites, and the like
- Aboveground biomass
- The amount of plant material above the ground, such as the trunks, branches, and leaves of forest trees
- Rhizotron method
- A method in which transparent windows are buried in the ground and root growth is examined by repeatedly photographing it through the windows
ResearchResearch themes
The lab works on developing forest remote sensing techniques for understanding ecosystem function and predicting ecosystem services. It combines field measurements of forest structure and leaf properties with drone and satellite imagery.
*Illustrative imageForest biomass and ecosystem services
The lab improves models that estimate aboveground biomass using drone laser surveys, satellite imagery, and data from field tree-by-tree inventories. Since 2024, it has also worked on remote sensing of ecosystem services in collaboration with forest and marine researchers at Hokkaido University, Chiba University, the National Institute for Environmental Studies, and other institutions.
*Illustrative imageMeasuring leaf properties without damaging them
Leaf properties are clues to how trees function and how organisms interact, but measuring leaves in the forest canopy is not easy. Using spectral models and hyperspectral reflectance data, the lab has tested methods for non-destructively estimating the leaf properties of East Asian trees, and also participates in building global datasets.
*Illustrative imageInvisible changes in roots and soil
Combining the rhizotron method with near-infrared imaging and spectroscopy, the lab investigates how root vitality and the composition of soil organic matter vary across place and time. It is testing spectral imaging methods for assessing belowground dynamics in boreal forests.
MembersFaculty
- ProfessorTatsuro Nakaji
VoicesStudent voices
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Green and yellow forest (Unsplash)” Nathan Anderson nathananderson / CC0 (cropped)
- Forest biomass and ecosystem services: “Great Smoky Mountains (MODIS)” MODIS Land Rapid Response Team, NASA GSFC / Public domain (cropped)
- Measuring leaf properties without damaging them: “HyperspectralCube” Dr. Nicholas M. Short, Sr. / Public domain (cropped)
- Invisible changes in roots and soil: “Braunerde Conv” U. Burkhardt / CC BY-SA 3.0 (cropped)
- Related lab (Biodiversity Lab (Kasada)): “Coccinella septempunctata, larva eating aphids” Gilles San Martin from Namur, Belgium / CC BY-SA 2.0 (cropped)
- Related lab (Regional Resource Management Lab): “Abies sachalinensis, Gora Lopatina, Sakhalin” User:Lupus-sapiens / CC0 (cropped)
- Related lab (Makoto's Plant & Soil Lab): “Hokkaido University Research Forest - panoramio” kazppi77 / CC BY 3.0 (cropped)
- Related lab (Nakamura Lab): “Quercus crispula 01” Σ64 / CC BY 3.0 (cropped)
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