The autotrophic respiration was regarded an important part in soil respiration and different type of root has different function and respiration rate. In previous research, the Moso bamoo forest has higher soil respiration and temperature sensitivity. To clarify the factor of the result, we used trenching methods to estimate the autotrophic respiration and use core sample methods to measure the respiration of fine roots, coarse roots and rhizome. Besides, we measure the dry weight and N concentration.

The autotrophic respiration is account about 50% in total soil respiration from spring, while 75% in summer and 60% in the fall. The contribution of fine root respiration to autotrophic respiration was about 50.3% and, and that of coarse roots respiration was about 37.1%. The fine roots respiration base on dry weight (= 33.19 μmol/s/kg) and temperature sensitivity is higher than the other type roots respiration (Coarse roots = 15.17μmol/s/kg, rhizome = 1.17μmol/s/kg). The N concentration ratio of fine roots was higher than coarse roots (N of fine roots was 1.01%, N of coarse roots was 0.47%. The N concentration of all the roots sample have positive relationship with roots respiration.