Research of Flux Footprint of Anji Bamboo Forest Ecosystems Based on the FSAM Model

Using the eddy covariance observation systems, continuous data of carbon fluxes and related factors in Anji Bamboo ecosystem was captured in 2013. The flux contribution area and its temporal dynamics was analyzed under different atmospheric conditions and different wind directions with FSAM （Flux Source Area Model）. The results showed that: the range of flux source areas increased with the atmospheric stability. Under stable air condition, the range of flux source areas was significantly larger than under the unstable air condition. The horizontal range and the longitudinal range were 20509 -217692m and 80236-88316m, 7256-70939m and 33792-39284m under those two air conditions in all directions, respectively. The range of flux source areas also changed with the seasons with no rules. About 9305% of flux came from the southeast, northeast and northwest of the tower, the ratio were 3745%， 2743% and 2817%, respectively.