YCS: Yuchen Site Site name Yuchen Site AsiaFlux site code YCS Location Yuchen county, Shandong Province Position 116.34°E, 36.50°N Elevation 28 m above sea level Slope Terrain type Yellow River alluvial plain Area Fetch Climate semi-humid and monsoon climate Mean annual air temperature 13.1 deg C Mean annual precipitation 528 mm Vegetation type crops Domestic species (Overstory) winter wheat,corn Dominant species (Understory) - Canopy height - Age - LAI - Soil type alluvial deposit of Yellow River and main is aquox and salted aquox
Observations Eddy Covariance method (CO
2 )
System Open path combined with closed path system (CO2 flux, latent heat flux) Wind speed Three dimensional sonic anemometer (CSAT3, CAMPBELL SCIENTIFIC) Air temperature Water vapor Open and closed path CO2 /H2 O analyzers CO2 Open and closed path CO2 /H2 O analyzers Measurement height 2 m Sampling frequency 10 Hz Averaging time 30 min Data logger CR5000 (CSI USA) Data storage Original data Raw data
Meteorology
Observation items Levels/ Depth Instrument Global solar radiation(incoming) 1 m CM11 (Kipp & Zonen, The Netherlands) Global solar Long-wave radiation(incoming) 1 m CNR1 (Kipp & Zonen, The Netherlands) Long-wave radiation(outgoing) 1 m CNR1 (Kipp & Zonen, The Netherlands) Net radiation 1 m CNR1 (Kipp & Zonen, The Netherlands) PPFD (incoming) PPFD (outgoing) - Direct / diffuse radiation - Direct / diffuse PPFD - Air temperature 1 m, 2 m HMP45C, VAISALA, Finland Humidity 1 m, 2 m HMP45C, VAISALA, Finland Soil temperature -5cm,-10cm,-20cm,-40cm,-80cm/-2cm,-5cm,-10cm,-20cm,-50cm Probe (105T/107, CAMPBELL SCIENTIFIC) Soil heat flux -5cm Heat flux plate (HFP01, HUKSEFLUX) Soil water -20 cm, -40cm CS616, Campbell Scientific Inc., Logan, UT, USA Wind speed 1 m, 2 m Anemometer (A100R, VECTOR INSTRUMENTS) Wind direction 2 m Wind vane (W200P, VECTOR INSTRUMENTS) Barometric 1 m Barometer (CS105, VAISALA) Precipitation 1 m Tipping-bucket rain gauge (52203, RM YOUNG) CO2 concentration
Other
Soil respiration - Photosynthesis - Ecological investigation
Observation Period and data Availability Measurement Period Measurement Frequency Continuous Data Availability 2003-2005 in AsiaFlux database
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