The research choice the secondary oak forest ecosystem in the forest ecopositioning location research station of Yangtze River Delta, Southeastern China, and monitored the CO2, H2O, temperature, moisture, PAR, and so on by eddy covariance. The data of regulated change and process of diurnal Net Ecosystem Exchange (NEE) of forest ecosystem were obtained during a year. The ecosystem began to absorb CO2 at about 7: 00 am, and maintains in great absorption from 10:00 to 14:00, at about 17: 30, the ecosystem began to release CO2. The analysis of the relationships of NEE and forest ecosystem and environmental factors, shows that: When the PAR>5 μmol/(m2·s), the relationship of NEE and PAR has no significant correlation in different season, monthly average NEE and monthly average temperature in canopy had linear relationship.
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