BDP: Bidoup forest
General site details
| Site name | Bidoup forest |
|---|---|
| AsiaFlux site code | BDP |
| Location | Bidoup Nui Ba National Park Da Chais village, Lac Duong districts, Lam Dong province,Vietnam |
| Position | 12°11'04.0'' N, 108°41'31.4'' E (GPS 18x LVC, Garmin, within SmartFlux2 system, LI-COR) |
| Elevation | 1498m |
| Slope | ~10° |
| Terrain type | Hilly mountains |
| Area | about 30 ha of uniform ecosystem around the tower |
| Fetch | 245 m (90%), 90 m (peak) |
| Climate | Cf, Mild temperate, fully humid |
| Mean annual air temperature | 17.5 (2022-2023) °С |
| Mean annual precipitation | 2980 mm (2022-2023) |
| Vegetation type | Polydominant mountain forest |
| Dominant Species (Overstory) | Pinus dalatensis, Рinus krempfii (Pinaceae), Dacricarpus imbricatus, Dacrydium elatum (Podocarpaceae), Rhodoleia championii (Rhodoleiaceae), Schima wallichii (Theaceae), Craibiodendron stellatum (Ericaceae), Magnolia sp. (Magnoliaceae). |
| Dominant Species (Understory) | Poilannammia costata, Pseudodissochaeta septentrionalis (Melastomataceae), Ardisia sp. (Myrsinaceae), Lasianthus spp. (Rubiaceae). |
| Canopy height | 25 m |
| Age | Primary forest |
| LAI | Not measured |
| Soil type | Topsoil 0-20 cm (black, 2.5Y 2.5/1 Munsell scale) with ferralitic soil below (light yellow-brown, 2.5Y 7/2, 7/4 — 4/4 Munsell scale) |
Observation
Eddy Covariance method (CO2)
| System | Enclosed-path system (CO2 flux, latent heat flux) |
|---|---|
| Wind speed | Three-dimensional sonic anemometer (WindMaster Pro, Gill inatruments) |
| Air temperature | Three-dimensional sonic anemometer (WindMaster Pro, Gill inatruments) |
| Water vapor | Enclosed-path CO2/H2O analyzer (LI-7200, LI-COR) |
| CO2 | Enclosed-path CO2/H2O analyzer (LI-7200, LI-COR) |
| Measurement height | 36 m |
| Sampling frequency | 10 Hz |
| Averaging time | 30 min |
| Data logger | LI-7550 Analyzer Interface Unit / SmartFlux2 |
| Data storage | USB drive, FTP upload |
| Original data | Raw data |
Meteorology
| Observation items | Levels/Depth | Instrument |
|---|---|---|
| Global solar radiation (incoming) | 36m | 4-component net radiometer with ventilation unit (CNR4+CNF4, K&Z) |
| Global solar radiation (outgoing) | 36m | 4-component net radiometer with ventilation unit (CNR4+CNF4, K&Z) |
| Long-wave radiation (incoming) | 36m | 4-component net radiometer with ventilation unit (CNR4+CNF4, K&Z) |
| Long-wave radiation (outgoing) | 36m | 4-component net radiometer with ventilation unit (CNR4+CNF4, K&Z) |
| Net radiation | 36m | 4-component net radiometer with ventilation unit (CNR4+CNF4, K&Z) |
| Air temperature | 36m, 2m | Platinum resistance thermometer and capacitive Hygrometer (HMP155, Vaisala) |
| Humidity | 36m, 2m | Platinum resistance thermometer and capacitive Hygrometer (HMP155, Vaisala) |
| Soil temperature | 8 cm (six points) | Thermistor (7900-180 temperature probe, LI-COR); HydraProbeII (Stevens) |
| Soil heat flux | 5 cm | Heat flux plate (HFP01, Hukseflux) |
| Soil water content | 8 cm | Coaxial Impedance Dielectric Reflectometry sensor (HydraProbeII, Stevens) |
| Wind speed | 36m | Sonic anemometer (WindMaster Pro, Gill inatruments) |
| Wind direction | 36m | Sonic anemometer (WindMaster Pro, Gill inatruments) |
| Barometric pressure | 36m | Analyser interface unit built-in barometer (LI-7550, LI-COR) |
| Precipitation | 36m | Tipping-bucket rain gauge (TE-525M, Texas Instruments) |
| CO2 concentration | 36m | Enclosed-path CO2/H2O analyzer (LI-7200, LI-COR) |
Observation Period and Data Availability
| Measurement Period | July 2022 -- present |
|---|---|
| Measurement Frequency | Continuous |
| Data Availability |
Contact
[PI – VN side]
Dinh Ba Duy (duydb.vrtc[at]gmail.com)
Joint Vietnam-Russia Tropical Science and Technology Research Center
Institute of Tropical Ecology
63 Nguyen Van Huyen str., Nghia Do ward, Hanoi city, 100000, Vietnam
Tel: (+8424) 38363906
[PI – RU side]
Julia Kurbatova (kurbatova.j[at]gmail.com)
A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences
V.N. Sukachev Laboratory of Biogeocenology
Leninsky Prospekt, 33
Moscow, 119071, Russia
Tel:+7(903)710-3744
[Fluxes, Meteorology, Instrumentation]
Vitaly Avilov (vitavilov[at]gmail.com)
A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences
V.N. Sukachev Laboratory of Biogeocenology Leninsky Prospekt, 33 Moscow, 119071, Russia
Tel:+7(903)262-6295
Dinh Vu Anh Tu (anhtu2893[at]gmail.com)
Natalia Myslitskaia (myslitskaya[at]gmail.com)
Fedor Amirov (amirow-fedor[at]mail.ru)
Ngo Thanh Dat (datdotq95[at]gmail.com)
Infrastructure
Tower (36m), ancillary building (2x4m), solar power, LTE communication, accomodation (2 km away)
Research Fund
Joint Vietnam-Russia Tropical Science and Technology Research Center
Calibration Information
・ LI-7200 – annual CO2/H2O zero using molecular sieve scrubber (31022 Zero Air Generator, Campbell Scientific), annual CO2 span – using reference gas (616ppm CO2 in air)
・ HMP155 – annual 2-point humidity adjustment by ~35% and ~85% points using reference capacitive hygrometer DV2-TS (Microfor, Russia), 1-point temperature adjustment using reference platinum thermometer PTSV-6-Km-3 (Microfor, Russia)
・ TE525M – annual field check using Rain Gauge Calibrator (52260, RM Young), 500ml, .50 orifice
・ CNR4 – annual field matching (+inversion test) with reference pyranometer (SR30D2, Hukseflux) and pyrgeometer (IR20, Hukseflux)
・ LI190R – annual field matching with reference quantum sensor (LI190R, LI-COR)
・ LI7550 integrated barometer – annual comparison with reference absolute pressure sensor PDE-020I-DA (Elemer, Russia)
Publication
N/A