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