Abstract: Four groups of Passer montanus were domesticated under different temperature (5 ℃ and 25 ℃) and photoperiod (16L∶8D and 8L∶16D) for four weeks, and their digestive tract morphology with body mass as the covariate was analyzed by the covariance with twofactors temperature and photoperiod and with single factor within groups, and by the Tukey’s HSD multicomparison. The decrease of temperature or the shortening of photoperiod made the length of digestive tract increased significantly, and vice versa. Temperature had significant effects on
 the dry mass of digestive tract, and its interaction with photoperiod affected the net fresh mass of digestive tract and the dry mass of digestive organs significantly. The total length of digestive tract and the length of digestive organs except large intestine, as well as the total mass of digestive tract and the mass of digestive organs, had significant differences among the groups. All the results suggested that different temperature and photoperiod induced the changes in the structure and function of digestive tract, which was closely related to the energy demand of the individuals, and their responses to the environmental stresses.

Key words: Spatially explicit landscape model, LANDIS, Fire disturbance, Windthrow, Harvest