Site name	Sakaerat
AsiaFlux site code	SKR
Location	Sakaerat Environmental Research Center,  Sakaerat, Nakonrachasima, Thailand
Position	14º 29' 32.5" N, 101º 54' 58.7" E (WGS84)
Elevation	543 m above sea level (WGS84)
Slope	6m/100m
Terrain type	Approximately flat
Area	78km2
Fetch	-
Climate	Tropical - desert (Aw)
Mean annual air temperature	24 degree C
Mean annual precipitation	1200-1300 mm
Vegetation type	Tropical seasonal evergreen forest
Domestic species (Overstory)	Hopea ferrea Pierre
Dominant species (Understory)	-
Canopy height	35 m
Age	Mature forest
LAI	3.5-4.0 m2 m-2 (PAI)
Soil type	Shallow Stony Ultisols (US Soil Texonomy)

Observations
Eddy Covariance method (CO₂)

System	Closed-path system
Wind speed	Three-dimensional sonic anemometer-thermometer  (Wind Master, Gill)
Air temperature	Three-dimensional sonic anemometer-thermometer  (Wind Master, Gill)
Water vapor	Closed-path CO2/H2O analyzers (LI-6262, LI-COR)
CO2	Closed-path CO2/H2O analyzers (LI-6262, LI-COR)
Measurement height	45 m
Sampling frequency	4 Hz
Averaging time	30 min
Data logger	NR-1000, Keyence, Japan
Data storage	HDD (Laptop PC)
Original data	Raw data

Meteorology

Observation items	Levels/ Depth	Instrument
Global solar radiation(incoming)	45 m	Radiometer (CNR1, Kipp&Zonen)
Global solar  radiation (outgoing)	45 m	Radiometer (CNR1, Kipp&Zonen)
Long-wave radiation(outgoing)	45 m	Radiometer (CNR1, Kipp&Zonen)
Long-wave radiation(outgoing)	45 m	Radiometer (CNR1, Kipp&Zonen)
Net radiation	45 m	Radiometer (CNR1, Kipp&Zonen)
PPFD (incoming)	45, 1  (two points) m	Quantum sensor (ML-020V, Eko, Japan)
PPFD (outgoing)	45 m	Quantum sensor (ML-020V, Eko, Japan)
Direct / diffuse radiation	45 m	Pyranometer (ML-020V, Eko, Japan)
Direct / diffuse PPFD	45 m	Pyranometer (ML-020V, Eko, Japan)
Air temperature	45, 35, 20, 5 m	Platinum resistance thermometer and capacitive  hygrometer (HMP45A, Vaisala)
Humidity	45, 35, 20, 5 m	Platinum resistance thermometer and capacitive  hygrometer (HMP45A, Vaisala)
Soil temperature	1, 5, 10, 20, 50  cm	Platinum resistance thermometer
Soil heat flux	2 cm  (two points)	Soil heat flux plate (MF-81, Eko, Japan)
Soil water   content	10cm, 50cm	Water content reflectometer (CS615, Campbell)
Wind speed	47 m	Combined wind vane and fan anemometer  (Met One, Campbell)
Wind direction	47 m	Combined wind vane and fan anemometer  (Met One, Campbell)
Precipitation	47 m	Tipping-bucket rain gauge (TE525, Campbell)
CO2 concentration	45, 35, 20, 5 m	Closed-path infrared gas analyzer  (LI-6262, LI-COR)
Radiation  Temperature	-	Infrared thermometer (IT-340, Horiba, Japan)

Other

Soil respiration	Chamber method, frequency: hourly
Ecological investigation	-