[KHW]
Kahoku Experiment watershed
  • Site Description
  • Observation
  • Researchers
  • Note

    • Eddy correlation method

    System Closed-path system (CO2 flux), Open-path system (H2O, CO2 flux)
    Wind speed Three-dimensional sonic anemometer-thermometer (DA600-3T, KAIJO, Japan)
    Air temperature Three-dimensional sonic anemometer-thermometer (DA600-3T, KAIJO, Japan)
    Water Vapor Open-path (LI-7500, LI-COR, USA)
    CO2 Closed-path (LI-7000, LI-COR, USA)
    Measurement height 51.0m
    Sampling frequency 10Hz
    Averaging time 30min
    Data logger DR-M3a, TEAC, Japan
    Data storage MO
    Original data (Raw data or statistics) Raw data

    Meteorology

    Observation items Levels / Depth Instrument
    Global solar radiation (incoming) 47.2m Pyranometer (CM14, Kipp & Zonen, Netherland)
    Global solar radiation (outgoing) 47.2m Pyranometer (CM14, Kipp & Zonen, Netherland)
    Long-wave radiation (incoming) 47.2m Infrared radiometer (CNR1, Kipp & Zonen, Netherland)
    Long-wave radiation (outgoing) 47.2m Infrared radiometer (CNR1, Kipp & Zonen, Netherland )
    Net radiation 47.2m Net radiometer (NR-LITE, Kipp & Zonen, Netherland)
    PPFD (incoming) N/A －
    PPFD (outgoing) 47.2m Quantum sensor (LI-190, LI-COR, USA)
    Direct/diffuse radiation 51.0m Pyranometer (CM3, Kipp & Zonen, Netherland) with shadow-band (PSB-100, Prede, Japan)
    Direct/diffuse PPFD N/A －
    Air temperature 51.0, 41.5, 34.0, 22.0, 10.5m Platinum resistance thermometer (HMP45D, VAISALA, Finland/ ML-020L, EKO, Japan)
    Humidity 51.0, 41.5, 34.0, 22.0, 10.5m Capacitive hygrometer (HMP45D, VAISALA, Finland), Wet bulb temperature (ML-020L, Eko, Japan)
    Soil temperature 0.05m Thermistor (HOBO S-TMB-002, Onset, USA)
    Soil heat flux 0.02m Heat flow transducer (HFT-3.1, REBS, USA)
    Soil water content 0.05m Capacitance prove (ECH2O, Decagon Devises, USA)
    Wind speed 45.7, 41.7, 37.7m 3-cups anemometer (Met-One 014A,)
    Wind direction 51.0m Three-dimensional sonic anemometer-thermometer (DA600, KAIJO, Japan)
    Barometric pressure 51.0m Barometric pressure sensor (PTB210, VAISALA, Finland)
    Precipitation 1.5m Rain gauge: 0.5mm tipping bucket (RT-5, Ikeda Keiki, Japan)
    CO2 concentration 44.2, 38.5, 33.5, 27.0, 20.2, 13.5, 6.8, 1.0m Closed-path CO2/H2O analyzer (LI-6262, LI-COR, USA)

    Other

    Soil respiration Continuous
    Ecological Investigation Tree heights, stand density, diameter: 9 plot sampling in 1999. LAI: once a month (LAI-2000, LI-COR, USA).
    Hydrological Investigation Runoff from the watershed (V-notch and float flow meter)
    Sap flow measurement Granier sensors (handmade)