YCS: Yuchen Site

General site detail (Updated 11 August 2014)
 Site name
 Yuchen Site
 AsiaFlux site code
 Location Yuchen county, Shandong Province
 Position 116.34°E, 36.50°N
 Elevation 28 m above sea level
 Terrain type
 Yellow River alluvial plain
 Climate semi-humid and monsoon climate
 Mean annual air temperature
 13.1 deg C
 Mean annual precipitation
 528 mm
 Vegetation type
 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

Eddy Covariance method (CO2)
 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/H2O analyzers
 (LI-7500 and LI-7000, LI-COR)
 CO2 Open and closed path CO2/H2O analyzers
 (LI-7500 and LI-7000, LI-COR)
 Measurement height
 2 m
 Sampling frequency
 10 Hz
 Averaging time
 30 min
 Data logger
 CR5000 (CSI USA)
 Data storage
 Original data
 Raw data

 Observation items
  Levels/ Depth
 Global solar radiation(incoming)
 1 m CM11 (Kipp & Zonen, The Netherlands)
 Global solar 
radiation (outgoing)
 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
 Soil heat flux
 Heat flux plate (HFP01, HUKSEFLUX)
 Soil water 
 -20 cm, -40cm
 CS616, Campbell Scientific Inc., Logan, UT, USA
 Wind speed
 1 m, 2 m
 Wind direction
 2 m Wind vane (W200P, VECTOR INSTRUMENTS)
 1 m
 Barometer (CS105, VAISALA)
 Precipitation 1 m Tipping-bucket rain gauge (52203, RM YOUNG)
 Soil respiration
 Photosynthesis -
 Ecological investigation
Observation Period and data Availability
 Measurement Period
 Measurement Frequency
 Data Availability
 2003-2005 in AsiaFlux database
 Zhao Fenghua (zhaofh [at] igsnrr.ac.cn)
Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Science
11A, Datun Road, Chaoyang District,   Beijing, 100101, P.R.China