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Forest Hydrology Lab
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The lab measures the water and carbon that circulate through forests and uses science to verify how forests function.
AboutAbout the lab
Understanding how forests function through the cycles of water and carbon.
The Forest Hydrology Lab scientifically investigates the many functions of forests, including the "green dam" effect, mitigation of global warming, purification of air and water, and moderation of climate.
Many forest functions are carried out as water and carbon circulate through the forest.
To understand the conditions under which these functions continue and where their limits lie, the lab studies how water and carbon circulate through forests, using observations at experimental sites in Japan and abroad.
Undergraduate students join the lab in their fourth year (graduate school: Division of Forest Science, Graduate School of Agriculture).
Key terms
- Transpiration
- The release of water as water vapor from the stomata of plant leaves
- Eddy covariance method
- A method that finely measures the vertical movement of wind and the concentration of a gas to determine the amount of that gas exchanged between the ground and the atmosphere
- Methane
- The greenhouse gas with the second-largest impact on global warming after carbon dioxide. It is released from wetlands, ponds, and similar places
NewsLab news
Published research results estimating greenhouse gas emissions from tropical peatlands
Published research results on a method for measuring forest–atmosphere gas exchange using "eddies"
An undergraduate student won a Student Poster Award at the Annual Meeting of the Japanese Forest Society
ResearchResearch themes
The lab studies photosynthesis and transpiration in tree leaves, gas exchange between forests and the atmosphere, and how water stored in forest soil drains out, using long-term observations at experimental sites in Japan and abroad.
*Illustrative imageOver 50 years of observing mountain water
The lab set up the Kiryu Experimental Watershed at the headwaters of the Kusatsu River in Shiga Prefecture, and has continued hydrological observations for more than 50 years since its founding in 1967. It still studies long-term changes in soil respiration in a Japanese cypress forest, among other topics.
*Illustrative imageMeasuring forest–atmosphere gas exchange with "eddies"
The lab has built a device usable in forests that puts into practice the "true eddy accumulation" measurement theory, which was conceived half a century ago but was difficult to make practical. It can accurately measure the exchange of a wide variety of gases that were previously difficult to measure.
*Illustrative imageExchange between tropical rainforest and the atmosphere
At the Pasoh Forest Reserve in Malaysia, the lab has continuously observed the exchange of carbon dioxide, water vapor, and heat between the forest canopy and the atmosphere using the eddy covariance method since September 2002.
*Illustrative imageMethane and carbon dioxide in irrigation ponds and cities
At irrigation ponds in Hyogo Prefecture, the lab observes methane emission rates using the eddy covariance method and studies water quality. On the rooftop of the Faculty of Agriculture Main Building, it observes the emission and uptake of carbon dioxide, among other things, around Kyoto University.
MembersFaculty
Members of the Forest Hydrology Lab are faculty members, project researchers, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorYoshiko Kosugi
- ProfessorEPRON Daniel
- Assistant ProfessorAyaka Sakabe
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: “Installation of the eddy covariance system” UBC Micrometeorology from Vancouver, Canada / CC BY 2.0 (cropped)
- Over 50 years of observing mountain water: “Chamaecyparis obtusa 'Aurea' Cyprysik japoński” Agnieszka Kwiecień, Nova / CC BY-SA 4.0 (cropped)
- Measuring forest–atmosphere gas exchange with "eddies": “Eddy Covariance Sonic IRGA” Veedar / Public domain (cropped)
- Exchange between tropical rainforest and the atmosphere: “Tropical Wet Evergreen Forest Rainforest Malaysia IMG” Rohitjahnavi / CC0 (cropped)
- Methane and carbon dioxide in irrigation ponds and cities: “Scenery of Shinji pond at Expo’70 Commemorative Park, November 2015, Osaka II” Laitche / CC BY-SA 4.0 (cropped)
- Related lab (Forest Utilization Lab): “Dülmen, Kirchspiel, Bauerschaft Börnste” Dietmar Rabich / CC BY-SA 4.0 (cropped)
- Related lab (Mountain Conservation Lab): “Oirase Mountain Stream 500px photo ( )” Chi King / CC BY 3.0 (cropped)
- Related lab (Biosphere Informatics Lab): “Forest stream - geograph.org.uk - 642718” Nigel Freeman / CC BY-SA 2.0 (cropped)
- Related lab (Tree Cell Biology Lab): “Resin Canals” Bweil2 / CC BY-SA 4.0 (cropped)
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