Energy Flux and Energy Balance Closure Analysis of Phyllostachys edulis Forest in Subtropical China during Growing Season

Abstract:

In order to understand the energy balance closure of Phyllostachys edulis forest in subtropical China during growing season, the changes in energy flux of P. edulis forest were studied from April to September in 2011 by using open-path eddy covariance method, and the characteristics of energy closure were analyzed by using EBR (Energy balance ratio) and OLR (Ordinary linear regression). The results showed that total net radiation of the forest in growing season was 1738.2 MJ m^-2, and the sensible flux heat, latent heat flux, and soil heat flux were 354.3 MJ m^-2, 1146.0 MJ m^-2, and 58.9 MJ m^-2, respectively. It was suggested that soil was a heat sink. The sensible and latent heat fluxes were accounting for 20.4% and 65.9% of the net radiation, respectively. The enrgy balance closure of P. edulis forest in growing season was 0.89, and the monthly average was 0.91, but there was 11% of energy imclosure. Therefore, the latent heat flux was the main form of energy loss. Diurnal variation in energy components all showed single peak curves based on net radiation, and energy closure was at high level.

Key words:Energy flux;Energy balance closure;Eddy covariance method;Phyllostachys edulis forest