JRS: Jurong Ecological Experimental Station
General site details
| Site name | Jurong Ecological Experimental Station |
|---|---|
| AsiaFlux site code | JRS |
| Location | Jurong City, Jiangsu Province, China |
| Position | 31° 48' 24.59" N, 119° 13' 2.15" E |
| Elevation | 15m a.s.l |
| Slope | 1-2 deg |
| Terrain type | Flat |
| Area | 40 ha |
| Fetch | 100-200m |
| Climate | Mild with no dry season, hot summer (Cfa) |
| Mean annual air temperature | 15.5 ℃ (1981-2010) Jurong Meteorological Observatory (about 17km away from JRS) |
| Mean annual precipitation | 1099.1 mm |
| Vegetation type | Summer rice-winter wheat rotation agroecosystem |
| Dominant Species (Overstory) | Summer rice-winter wheat |
| Dominant Species (Understory) | - |
| Canopy height | about 0.8-1.5 m |
| Age | 1 year old |
| LAI | 5.5 m2m-2 (rice maximum LAI), 4.0 m2m-2 (wheat maximum LAI) |
| Soil type | Typic Hapli-Stagnic Anthrosol (or waterlogged paddy soil) (China) or as Typic Haplaquepts (USDA) |
Observation
Eddy Covariance method (CO2)
| System | Open-path system (CO2 flux, latent heat flux) |
|---|---|
| Wind speed | 3D ultrasonic anemometer (WindMaster Pro, UK) |
| Air temperature | 3D ultrasonic anemometer (WindMaster Pro, UK) |
| Water vapor | Open-path CO2/H2O analyzers (LI-7500A, USA) |
| CO2 | Open-path CO2/H2O analyzers (LI-7500A, USA) |
| Measurement height | 3.5 m |
| Sampling frequency | 10 Hz |
| Averaging time | 30 min |
| Data logger | Sutron 9201B, USA |
| Data storage | Flash memory |
| Original data | Raw data |
Meteorology
| Observation items | Levels/Depth | Instrument |
|---|---|---|
| Global solar radiation (incoming) | 2.25 m | Four-component radiometer (CNR4, Netherlands) |
| Global solar radiation (outgoing) | 2.25 m | Four-component radiometer (CNR4) |
| Long-wave radiation (incoming) | 2.25 m | Four-component radiometer (CNR4) |
| Long-wave radiation (outgoing) | 2.25 m | Four-component radiometer (CNR4) |
| Net radiation | 2.25 m | Four-component radiometer (CNR4) |
| PPFD (incoming) | 2.25 m | Quantum sensor (LI-190SL, USA) |
| PPFD (outgoing) | 2.25 m | Quantum sensor (LI-190SL, USA) |
| Air temperature | 0.50, 2.60 m | Humidity and temperature probes (HMP155, Finland) |
| Humidity | 0.50, 2.60 m | Humidity and temperature probes (HMP155, Finland) |
| Soil temperature | 0.05, 0.10, 0.20, 0.30, 0.50 m | Soil temperature sensors (LI-7900-180, USA) |
| Soil heat flux | 0.05 m x 3 | Heat flux plate (HFP01, Netherlands) |
| Soil water content | 0.05, 0.20 m | Soil probes (Stevens Hydra ProbeⅡ, USA) |
| Wind speed | 3.5 m | 3D ultrasonic anemometer (WindMaster Pro, UK) |
| Wind direction | 3.5 m | 3D ultrasonic anemometer (WindMaster Pro, UK) |
| Barometric pressure | 3.5 m | 3D ultrasonic anemometer (WindMaster Pro, UK) |
| Precipitation | 2.0 m | Tipping bucket rain gauge (TR-525M, USA) |
Fluxes of non-CO2 gases
| Gas | CH4 |
| Method | CH4 (open-path EC (LI-7700, USA)) |
| Measurement height | CH<sub>4</sub> (3.5 m) |
| Data logger | Sutron 9201B, USA |
| Data storage | Flash memory |
Other
| Photosynthesis | Occasionally |
| Ecological Investigation | LAI, Biomass, plant height, root length, grain yield |
Observation Period and Data Availability
| Measurement Period | From April 2015 to December 2016 |
|---|---|
| Measurement Frequency | Continuous |
| Data Availability | N/A |
Contact
[Flux and Micrometeorology]
Weimin Ju (juweimin[at]nju.edu.cn)
International Institute for Earth System Sciences (ESSI),
Nanjing University (NJU)
B433 Kunshan Building, 163 Xianlin Avenue, Qixia District, Nanjing,
Jiangsu Province, 210023 China
Phone: +86-25-83595670 Fax: +86-25-83592288
[Sun-Induced chlorophyll Fluorescence, SIF]
Yongguang Zhang (yongguang_zhang[at]nju.edu.cn)
International Institute for Earth System Sciences (ESSI),
Nanjing University (NJU)
B435 Kunshan Building. 163 Xianlin Avenue, Qixia District, Nanjing,
Jiangsu Province, 210023 China
Phone: +86-25-89681569 Fax: +86-25-89687077
[General Administrator]
Yanlian Zhou (zhouyl[at]nju.edu.cn)
School of Geography and Ocean Sciences (SGOS),
Nanjing University (NJU)
163 Xianlin Avenue, Qixia District, Nanjing, Jiangsu Province,
210023 China
Phone: +86-25-89681569 Fax: +86-25-89687077
Infrastructure
Tower, Electrical power (AC), Facilities for Communication (internet)
Research Fund
#1 National Key R&D Program of China (2016YFA0600202)
#2 National Natural Science Foundation of China (41671343)
#3 National Natural Science Foundation of China (41671421)
Publication
Shengpei DAI, Weimin JU, Yongguang ZHANG, Qiaoning HE, Lian SONG, Ji LI. Variations and drivers of methane fluxes from a rice-wheat rotation agroecosystem in eastern China at seasonal and diurnal scales. Science of the Total Environment, 2019, 690:973-990.