Site name	Rubber Flux Bueng Kan
AsiaFlux site code	RFB
Location	Pak Khat district, BuengKan province, Thailand
Position	18°13'22.77"N , 103°18'59.46"E
Elevation	186 m
Slope	1-3 degree
Terrain type	Flat
Area	16 ha
Fetch	-
Climate	Tropical monsoon climate
Mean annual air temperature	27ºC
Mean annual precipitation	1816 mm
Vegetation type	Mono-specific rubber tree (Hevea brasiliensis)  plantation
Domestic species (Overstory)	Rubber tree (Hevea brasiliensis Müll. Arg.)
Dominant species (Understory)	Tropic ageratum (Ageratum conyzoides L.)
Canopy height	8-9 m
Age	4 years old
LAI	1.5
Soil type	Sandy clay loam at 0-1 m and Clay loam at    0.1-0.3 m (Phon Phisai series: Pp)

Observations
Eddy Covariance method (CO₂)

System	Open-path system (LI-7500, LI-COR)
Wind speed	Three-dimensional sonic anemometer-thermometer  (Campbell CSAT3)
Air temperature	Three-dimensional sonic anemometer-thermometer  (Campbell CSAT3)
Water vapor	Open-path CO2/H2O analyzer (LI-7500, LI-COR)
CO2	Open-path CO2/H2O analyzer (LI-7500, LI-COR)
Measurement height	11.5 m
Sampling frequency	20 Hz
Averaging time	30 min
Data logger	CR5000, (Campbell Sci., USA)
Data storage	CF
Original data	Raw data

Meteorology

Observation items	Levels/ Depth	Instrument
Global solar radiation(incoming)	15 m	Net radiometer (CNR-1, Campbell)
Global solar  radiation (outgoing)	15 m	Net radiometer (CNR-1, Campbell)
Long-wave radiation(outgoing)	15 m	Net radiometer (CNR-1, Campbell)
Long-wave radiation(outgoing)	15 m	Net radiometer (CNR-1, Campbell)
Net radiation	15 m	Net radiometer (CNR-1, Campbell)
PPFD (incoming)	15 m	LI-190,Li-Cor Inc., Lincoln, NE, USA
PPFD (outgoing)	-
Direct / diffuse radiation	15 m	LI-COR Silicon Pyranometer   (LI-200SA, Li-COR)
Direct / diffuse PPFD	-
Air temperature	15.5 m	Temperature and Relative Humidity  Probe  (Vaisala HMP50)
Humidity	15.5 m	Temperature and Relative Humidity  Probe  (Vaisala HMP50)
Soil temperature	0.2 m and  0.4,0.6,0.16,0.32,0.64,  1 m (three points)	Averaging Soil Thermocouple, TCAV  Sensors , Campbell) and Thermocouple  Type E
Soil heat flux	8 cm ( two points)	Soil Heat Flux Plate  (HFP01-L, Campbell)
Soil water   content	0.6,0.10,0.30,0.50,0.70,  1,1.50 m (three points)	TDR sensor (CS616, Campbell)
Wind speed	16 m	Campbell 03002 R.M. Young Wind  Sentry Set
Wind direction	16 m	Campbell 03002 R.M. Young Wind  Sentry Set
Barometric   pressure	-
Precipitation	15 m	Tipping-bucket rainguage
CO2 concentration	11.5 m	Open-path CO2/H2O analyzer   (Li 7500, Li-Cor Inc., Lincoln, NE, USA)
H2O concentration	11.5 m	Open-path CO2/H2O analyzer   (Li 7500, Li-Cor Inc., Lincoln, NE, USA)

Other

Soil respiration	LI8100A-automated soil respiration   (every 2 week)
Photosynthesis	-
Ecological investigation	Tree height, diameter, root growth and  turnover, phenology, LAI and canopy  structure, litter dynamics, sap flow  velocity, water potential in tree