IRI - AsiaFlux

IRI: IRRI Flux Research Site

General site detail (updated 16 May 2012)

Site name	IRRI Flux Research Site
AsiaFlux site code	IRI
Location	IRRI, Los Banos, Laguna, Philippines
Position	14.2°N, 121.3°E
Elevation	21 m above sea level
Slope	1-2º
Terrain type	Agricultural land
Area	8 ha
Fetch	100-150 m
Climate	Tropical
Mean annual air temperature	27.5°C (1979-2007)
Mean annual precipitation	2075 mm (1979-2007)
Vegetation type	Rice
Domestic species (Overstory)	-
Dominant species (Understory)	-
Canopy height	1 m
Age	About 120 days
LAI	About 6.5(Max.)
Soil type	Aquandic Epiaquoll

Observations
Eddy Covariance method (CO₂)

System	Open-path system (CO₂ flux, latent heat flux)
Wind speed	3D sonic anemometer(CSAT3, Campbell Sci., Inc., USA)
Air temperature	3D sonic anemometer(CSAT3, Campbell Sci., Inc., USA)
Water vapor	Open path(LI-7500, Li-Cor, USA)
CO₂	Open path(LI-7500, Li-Cor, USA)
Measurement height	2.25 m
Sampling frequency	10 Hz
Averaging time	30 min
Data logger	CR3000 (Campbell, USA)
Data storage	CF
Original data	Raw data

Meteorology

Observation items	Levels/ Depth	Instrument
Global solar radiation(incoming)	2.25 m	Pyranometer (LI-200S, LI-COR, USA) Net radiometer (NR01, Hukseflux, Campbell, USA)
Global solar radiation (outgoing)	2.25 m	Net radiometer (NR01, Hukseflux, Campbell, USA)
Long-wave radiation(incoming)	2.25 m	Net radiometer (NR01, Hukseflux, Campbell, USA)
Long-wave radiation(outgoing)	2.25 m	Net radiometer (NR01, Hukseflux, Campbell, USA)
Net radiation	2.25 m	Net radiometer (NR01, Hukseflux, Campbell, USA)
PPFD (incoming)	2.25 m	Quantum sensor (LI-190S, LI-COR, USA)
PPFD (outgoing)	2.25 m	Quantum sensor (LI-190S, LI-COR, USA)
Direct / diffuse radiation	-
Direct / diffuse PPFD	-
Air temperature	0.75, 2.25 m	Platinum resistance thermometer (HMP45C, Vaisala)
Humidity	0.75, 2.25 m	Capacitive hygrometer (HMP45C, Vaisala)
Soil temperature	0.05, 0.10, 0.15 m	T-type thermocouple
Soil heat flux	-
Soil water content	-
Wind speed	2.25 m	Vantage Pro2 Plus weather system (Davis, USA)
Wind direction	20.8 m	Vantage Pro2 Plus weather system (Davis, USA)
Barometric pressure	2.25 m	Vantage Pro2 Plus weather system (Davis, USA)
Precipitation	2.25 m	Vantage Pro2 Plus weather system (Davis, USA)
CO₂concentration	2.25 m	LI-7500 (Li-Cor, USA)
H₂O concentration	2.25 m	LI-7500 (Li-Cor, USA)

Other

Soil respiration	-
Photosynthesis	-
CH₄	eddy covariance (Half hourly) since 2011-
Ecological investigation	Biomass, LAI, plant height, tiller no.

Observation Period and Data Availability

Measurement Period	from January 2008 to present
Measurement Frequency	Continuous
Data Availability	2009 - 2010 in AsiaFlux Database

Contact

Maricar Alberto (maricar.alberto[at]yahoo.com )
R.Wassmann (R.Wassmann[at]IRRI.ORG)
Rice Climate Change Consortium, Crop & Environmental Sciences Division, International Rice Research Institute, College, 4030
Los Banos, Laguna, Philippines
TEL : +63(49)536-2701 loc 2300 FAX : +63(49)536-7995

Calibration Informationion

Open-path analyzers were calibrated approximately in every 6 months with standard CO₂ gases and a dew point generator(LI610, Li-Cor, USA).

Publication

Alberto, M.C.R., Wassmann, R., Hirano, T., Miyata, A., Kumar, A., Padre, A., Amante, M., 2009. CO2/heat fluxes in rice fields: Comparative assessment of flooded and non-flooded fields in the Philippines. Agricultural and Forest Meteorology. 149, 1737-1750.

Alberto, M.C.R., Wassmann, R., Hirano, T., Miyata, A., Hatano, R., Kumar, A., Padre, A., Amante, M., 2011. Comparisons of energy balance and evapotranspiration between flooded and aerobic rice fields in the Philippines. Agricultural Water Management. 98, 1417-1430.

Alberto, M.C.R., Hirano, T., Miyata, A., Wassmann, R., Kumar, A., Padre, A., Amante, M., 2012. Influence of climate variability on seasonal and interannual variations of ecosystem CO2 exchange in flooded and non-flooded rice fields in the Philippines. Field Crops Research.