IRI: IRRI Flux Research Site
General site details
| 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)from January 2008 to present |
| Mean annual precipitation | 2075 mm (1979-2007) |
| Vegetation type | Rice |
| Dominant Species (Overstory) | - |
| Dominant Species (Understory) | - |
| Canopy height | 1 m |
| Age | About 120 days |
| LAI | About 6.5(Max.) |
| Soil type | Aquandic Epiaquoll |
Observation
Eddy Covariance method (CO2)
| System | Open-path system (CO<sub>2</sub> 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) |
| CO2 concentration | 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 Information
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.