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GBK: Gimje Soybean Field

General site detail (Updated 20 May 2024)

Site name	Gimje Soybean Field
AsiaFlux site code	GBK
Location	Yeonpo-ri, Juksan-myeon, Gimje-si, Korea
Position	35°45'03.301"N, 126°48'49.500"E
Elevation	6m above sea level
Slope	N/A
Terrain type	Flat
Area	Farmland
Fetch	N/A
Climate	Continental Climate (Dfa)
Mean annual air temperature	13.4 ℃ (2013-2022)
Mean annual precipitation	1,094 mm (2013-2022)
Vegetation type	Soybean Field
Dominant Species (Overstory)	Glycine max (L.) Merrill
Dominant Species (Understory)	-
Canopy height	~ 1 m
Age	Annual Plant
LAI	~ 6 (±1)
Soil type	N/A

Observations

Eddy Covariance method (CO₂)

System	Open-path (CO₂ flux, latent heat flux)
Wind speed	3D sonic anemometer (CSAT3)
Air temperature	3D sonic anemometer (CSAT3)
Water vapor	Open path infrared gas analyzer (EC-150)
CO₂	Open path infrared gas analyzer (EC-150)
Measurement height	4 m
Sampling frequency	10 Hz
Averaging time	30 min.
Data logger	CR3000 (Campbell Sci., Inc., USA)
Data storage	CF card
Original data	Statistics (Raw data is also available)

Meteorology

Observation items	Levels / Depth	Instrument
Global solar radiation (incoming)	1.5ｍ	Net radiometer (CNR4, Kipp & Zonen, Netherlands)
Global solar radiation (outgoing)	1.5 m	Net radiometer (CNR4)
Long-wave radiation (incoming)	1.5 m	Net radiometer (CNR4)
Long-wave radiation (outgoing)	1.5 m	Net radiometer (CNR4)
Net radiation	1.5 m	Net radiometer (CNR4)
Air temperature	1.5 m, 4 m	Temperature and RH prove (HPM155, Vaisala, Finland)
Humidity	1.5 m, 4 m	Temperature and RH prove (HMP155)
Soil temperature	-0.3 m	Soil thermocouple prove (TCAV, Campbell Sci., Inc., USA)
Soil heat flux	-0.3 m	Heat Flux plate (HFP-1, Campbell Sci., Inc., USA)
Soil water content	-0.3 m	Water content reflectometer (CS-616, Campbell Sci., Inc., UAS)
Wind speed	4 m	3D sonic anemometer (CSAT3, Campbell Sci., Inc., USA)
Wind direction	4 m	3D sonic anemometer (CSAT3)
Barometric pressure	4 m	Open path infrared gas analyzer (EC-150, Campbell Sci., Inc., USA)
Precipitation	1.5 m	Tipping bucket rain gauge
CO₂ concentration	4 m	Open path infrared gas analyzer (EC-150)
H₂O concentration	4 m	Open path infrared gas analyzer (EC-150)

Other

Photosynthesis	Portable chamber (LI-6400XT, Li-Cor)
Canopy structure	Digital camera, LED sensor
Ecological investigation	LAI, Plant height, Dry weight
Soil respiration	N/A

Observation Period and Data Availability

Measurement Period	June 2016 to present
Measurement Frequency	Continuous
Data Availability	-

Contact

Mingu Kang (hyekky[at]korea.kr)
National Institute of Agricultural Sciences,
Rural Development Administration
166, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do,
55365, KOREA
Phone: +82-63-238-2523 Fax: +82-63-238-3823

Kyo-Moon Shim (kmshim[at]korea.kr)
National Instiute of Agricultural Sciences,
Rural Development Administration
166, Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do,
55365, KOREA
Phone: +82-63-238-2518 Fax: +82-63-238-3823

Infrastructure

Tower, Electrical power (AC)

Research Fund

Rural Development Administration Research and Development Program (Project No. PJ014892)

Calibration Information

Open-path gas analyzer (EC-150) were calibrated approximately in every year with standard CO₂ gases and a dew point generator (LI-610, Li-Cor, USA).

Publications

Jina Hur et al. (2020). Estimation and Comparison of Carbon Uptake in Rice Paddy, Dry Cropland and Grove in South Korea using Eddy Covariance Flux Data. Korean Journal of Environmental Agriculture 39(4): 334-342.