[D01]
Duolun steppe

Eddy Correlation Method

System	Open path system (CO2 flux, latent heat flux)
Wind speed	Three-dimensional sonic anemometer (CSAT-3, Campbell Scientific Inc., Logan, UT, USA)
Air temperature	Three-dimensional sonic anemometer (CSAT-3, Campbell Scientific Inc., Logan, UT, USA)
Water Vapor	Open path CO2/H2O analyzers (LI-7500, LI-COR)
CO2	Open path CO2/H2O analyzers (LI-7500, LI-COR)
Measurement height	3.5 m
Sampling frequency	10 Hz
Averaging time	30 min
Data logger	CR5000 (CSI, USA)
Data storage	CF card
Original data (Raw data or statistics)	Raw data

Meteorology

Observation items	Levels / Depth	Instrument
Global solar radiation (incoming)	4 m	CNR1 (Kipp and Zonen, Delft, Holland)
Global solar radiation (outgoing)	4 m	CNR1 (Kipp and Zonen, Delft, Holland)
Long-wave radiation (incoming)	4 m	CNR1 (Kipp and Zonen, Delft, Holland)
Long-wave radiation (outgoing)	4 m	CNR1 (Kipp and Zonen, Delft, Holland)
Net radiation	4 m	CNR1 (Kipp and Zonen, Delft, Holland)
PPFD (incoming)	4 m	Li190SB,Li-Cor Inc., Lincoln, NE, USA
PPFD (outgoing)	-	-
Direct/diffuse radiation	-	-
Direct/diffuse PPFD	-	-
Air temperature	1, 2, 4 m	HMP-45C, Vaisala, Helsinki, Finland
Humidity	1, 2, 4 m	HMP-45C, Vaisala, Helsinki, Finland
Soil temperature	5, 10, 20 cm	Model 107, Campbell Scientific Inc., Logan, UT, USA
Soil heat flux	2 cm	HFT-3, Campbell Scientific Inc., Logan, UT, USA
Soil water content	0-10 cm	CS616, Campbell Scientific Inc., Logan, UT, USA
Wind speed	3.5 m	CSAT-3, Campbell Scientific Inc., Logan, UT, USA
Wind direction	3.5 m	CSAT-3, Campbell Scientific Inc., Logan, UT, USA
Barometric pressure	-	-
Precipitation	4 m	TE525, Texas Electronics, Texas, USA
CO2 concentration	3.5 m	Li 7500, Li-Cor Inc., Lincoln, NE, USA

Other

Soil respiration	Li 6400 (LI-COR)
Photosynthesis	Li 6400 (LI-COR)
Ecological Investigation	LAI (Li3000A, LI-COR)