Tomakomai site before 2004




The monitoring had been conducted in cooperation with the Experimental Plantation and Faculty of Agriculture of Hokkaido University, and Environmental Sciences Research Center of Hokkaido along with other institutions. In addition, comprehensive field research on the carbon cycle in forest ecosystem was conducted with the cooperation of the National Institute of Advanced Industrial Science and Technology and Faculty of Agriculture of Osaka Prefecture University. Unfortunately, the tower and observation system were destroyed by the strong winds during a typhoon in 2004 and the monitoring was stopped . The following is an overview of the observations conducted from July 2000 to September 2004.

Observation site

Location Forest No.1196-1198, Tomakomai National Forest, Tomakomai, Hokkaido (Within the jurisdiction of Tomakomai Office, Iburi-higashi Forest Management Office)
Latitude and Longitude: 42º 44' 13.1" N,141º 31' 7.1" E
Elevation: 115-140m
Land Gradient: 1-2 degrees
Soil type: Volcanogenous regosol
Vegetation Type: Japanese larch forest
Tree age: about 45 years old
Tree height: 18~20m
Area: 117 ha (Larix forest 98 ha)
Dominant Species (Over story): Japanese larch (Larix Kaempferi Sarg.), Birch (Betula ermanii and Betula platyphylla), Japanese elm (Ulmus japonica), Spruce (Picea jezoensis)
Dominant Species (Understory): Fern (Dryopteris crassirhizoma, Dryopteris austriaca) and Pachysandra terminalis
Mean annual air temperature 6.5℃ (2001-2003)
Annual precipitation 1055 mm (2001-2003)
Annual global solar radiation 4199 MJm-2 (2001-2003)

Observation Facilities(detail)

Observation tower (2) Gas flux monitoring site: Height 41 m (Aluminium frame)
Ecological research site: Height 25 m (Alminium frame)
Mobile laboratory (2) Two portable cabins of about 10 m2

Observation System

System Item Number Installed places
Eddy covariance method Three-dimensional sonic anemometer-thermometer 2 Tower boom, tower
Open-path systems (CO2 flux, latent heat flux) 3 Tower boom (2), tower
Closed-path systems (CO2 flux, latent heat flux) 2 Tower boom, tower
Concentrations CO2 profile 1 set 10 elevation
Soil respirationContinuous (automated chambers) Forest floor
Phenology Fisheye Lens Camera 2 Tower, Forest floor
MeteorologySolar radiation 10 Tower top, Tower (3), Forest floor (6)
Photosynthetic active radiation (PPFD) 5 tower (2), Forest floor (3)
1 set In pairs: Tower top
UV-A radiation 1 Tower top
UV-B radiation 1 Tower top
Direct/sky solar radiation 1 Tower top
Spectral radiation (Rotary type) 2 In pairs: Tower top, Forest floor
Net radiation 3 Tower boom, Tower, Forest floor
Air temperature, Air humidity 8 Tower boom, Tower (6), Forest floor
Two-dimensional Wind direction and speed 7 Tower (6), Forest floor
Atmospheric pressure 2 Ground level, Forest floor
Precipitation 4 Tower top, Forest floor
Snow depth 1 Ground level
Soil temperature 12 Forest floor (mesuring at 3 points in 4 different depths)
Soil water content 6 Forest floor (measuring at 3 points in 2 different depths)
Soil heat flux 5 Forest floor (measuring at 5 points)



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