Abstract:Alsophila spinulosa appeared mostly in the early Lias or late Trias of the Mesozoic period. The soil respiration characteristics of Alsophila spinulosa forest as a typical living fossil terrestrial ecosystem,was studied. The result indicated that the soil respiration rate of Alsophila spinulosa forest is very low in June，the soil respiration rate with litter and without litter are 0.87μmol·m-2·s-1 and 0.89μmol·m-2·s-1, respectively, the two processes have not difference significantly（P>0.05）. As a result of invasion by other species, include bamboo, deciduous broad\|leaf tree and evergreen broad-leaf tree, Alsophila spinulosa with them formed other three mixed forests. Based on the results, we found that the soil respiration rates of the three mixed forests are higher than the Alsophila spinulosa forest. The mean soil respiration rate are 2.95, 206μmol·m-2·s-1, and 1.33μmol·m-2·s-1, respectively. It were found that they have significantly difference with Alsophila spinulosa forests (P<0.001) after a statistical analysis.The influence of litter for three forests are that the bamboo-Alsophila spinulosa mixed forest (MF) and evergreen broadleaf-Alsophila spinulosa mixed forest (CF) both have significant differences (P<0.001), however, the deciduous broadleaf -Alsophila spinulosa mixed forest (LF) has no significant difference (P>0.05). In a short time period, analyzing the daily dynamic soil respiration rates of the four forests, they display a consistent steady process. The variation of soil temperature and humidity are not closely relative with the soil respiration of four Alsophila spinulosa forests.