Gengeral site detail (Updated 19 July 2007)
 Site name
 National Institute of Fruit Tree Science
 AsiaFlux site code
 Location Fujimoto, Tsukuba, Ibaraki, Japan
 Position 36° 33´ N, 140° 8´ E
 Elevation 40 m above sea level
 Slope 0 degree
 Terrain type
 Area 400 m2
 Fetch 50-90 m
 Climate -
 Mean annual air temperature
 Mean annual precipitation
 Vegetation type
 Fruit farm
 Domestic species (Overstory)
 Japanese pear
 Dominant species (Understory)
 Poor vegetation of annual weeds
 (mowed several times a year)
 Canopy height
 2.2-3.5 m (seasonally change)
 Age 22 years (2001)
 LAI 0 to 4
 Soil type

Eddy Covariance method (CO2)
 System open-path system 
 Wind speed
 Gill research
 Air temperature
 Water vapor
 Advanet E009b
 CO2 Advanet E009b
 Measurement height
 3.5 m
 Sampling frequency
 10 Hz
 Averaging time
 20 min
 Data logger
 Not used
 Data storage
 Directly to PC (Dell)
 Original data

 Observation items
  Levels/ Depth
 Global solar radiation(incoming)
 - Thermocouple type pyranometer (MS-61, EKO)
 Global solar 
radiation (outgoing)
 Long-wave radiation(outgoing) 
 Long-wave radiation(outgoing) 
 Net radiation
 5 m Ventilated radiometer(CN11, EKO)
 PPFD (incoming)
 PPFD (outgoing)
 Direct / diffuse radiation
 Direct / diffuse  PPFD
 Air temperature
 Just above     canopy surface  and above 0.8  m Ventilated thermocouple psychrometer  (handmade)
 Humidity Just above  canopy surface  and above 0.8  m Dew point hygrometer (handmade)
 Soil temperature
 0.05 m Thermocouple
 Soil heat flux
 Soil water 
 0.1, 0.2 m DIK-1600
 Wind speed
 Wind direction
 Precipitation - 
 - IRGA (Yokokawa electric )
 Soil respiration
 Photosynthesis -
 Ecological investigation
 LAI, Fruit yield
Observation Period and Data Availability
 Measurement Period
 Apr. 1997 to Oct. 2000 (Apr. 2000  to Oct. 2000 for Eddy Covarience  Method)
 Measurement Frequency
 From 0600 to 1800 every day from  April to October
 Data Availability
 Daiyu ITO (daiyu [at]
 Toshihiko SUGIURA
 Haruyuki KURODA
 Teaching and Research Center for Bio-coexistence, Faculty of  Agriculture and Life Science, Hirosaki University7-1, Shimobukuro,  Fujisaki, Fujisaki, Aomori, 038-3802, JAPAN
 Electrical power (AC 100V)