Location
Qingyuan Forest CERN, Chinese Academy of Sciences; Qingyuan Forest, National Observation and Research Station, Liaoning Province are affiliated with Institute of Applied Ecology, Chinese Academy of Sciences. The station locates at Dasuhe Town, Qingyuan Manchu Autonomous County, Liaoning Province, China ( 41°51′10″N，124°55′31″E，asl 669m ). The vegetation type of the underlying surface of the flux tower is temperate secondary deciduous broadleaf forest.
Climatic
The region has a continental monsoon climate with a windy spring, a warm and humid summer, and a dry and cold winter.
The mean annual air temperature is 4.7°C, and it varies from −37.6 °C in January to 36.5°C in July. The frost-free period ranges from 120 to 139 days. Annual precipitation fluctuates from 700 to 850 mm, and 80% of precipitation falls during June to August.
Vegetation and soil
The main forest types include mixed broadleaved forest (Juglans mandshurica, Fraxinus mandschurica, F. rhynchophylla, Acer mono. Betula costata, etc.) and Mongolian oak (dominated by Quercus mongolica) forest, Korean pine (Pinus koraiensis) plantation forest, larch (Larix spp.) plantation forest (LPF). The canopy height is approximately 13.9±0.6m.The soil under the flux tower is brown soil.
Observation system
The flux tower was equipped with closed-path eddy covariance systems (CPEC310, Campbell Scientific Inc., USA) and atmospheric profile systems (AP200, Campbell Scientific Inc., USA). The closed-path eddy covariance systems (CPEC310, Campbell Scientific Inc., USA) consists of a closed-path infrared gas analyzer (EC155, Campbell Scientific Inc., USA), a three-dimensional sonic anemometer (CSAT3A, Campbell Scientific Inc., USA) and a datalogger (CR6, Campbell Scientific Inc., USA).
CPEC310 was installed at 46.5 m height above the ground. The CO2/H2O concentrations were measured at 0.5 m, 2 m, 6 m, 11 m, 16 m, 21 m, 26 m, and 36.0 m above the ground along the towers using the AP200. The raw data of CPEC310 at a frequency of 10 Hz, the raw data of AP200 at a frequency of 2 Hz, and the 30 min-average of flux and micrometeorology measurements were recorded.
Principal Investigator
Tian Gao E-mail: tiangao@iae.ac.cn