2.2. Flux and abiotic measurements
The eddy covariance sensor array included a three-dimensional ultrasound
anemometer (CSAT3, Campbell, Scientific Inc., Logan, Utah, United
States), open-path infrared CO2/H2O
analyzer (CS7500, Campbell Scientific Inc.). The data collector records
the raw data at a frequency of 10 Hz. The mean, variance, and covariance
values of the raw data were calculated and logged every 30 min with a
data logger (CR5000, Campbell Scientific Inc., Logan, Utah, United
States). The collected data were adjusted by WPL (Webb, Pearman and
Leuning) density adjustment. The microclimate observation system
includes wind direction and wind speed (150 cm and 250 cm), air
temperature and humidity (150 cm and 250 cm), net radiation (150 cm),
soil temperature (0, 5, 10, 20, 40 cm) and rainfall sensor (50 cm) and
photosynthetic photon flux density (LI-190SB, LI-Cor, USA). Due to there
are much water on the wetland surface, so soil moisture and soil heat
flux were not measured