A field study was conducted in Jinyun Mountain Nature Reserve

Chongqing City from July to December in 2010.A LI-8100soil carbon flux measurement system(LI—COR)was employed to measure soil respiration rates(SRRs)in bamboo

mixed wood and coniferous forests.In addition

soil temperature and volumetric water contents were measured at 5cm below ground.By analyzing temporal change characteristic of SRR and its relationship with soil temperature

moisture and litter

the results indicate that no obvious diurnal variation of SRR was found in all the three forests.SRRs during day time were greater than those at night.SRR changed significantly monthly:it gradually increased from July to August and decreased from August to December.The average SSRs during experiment period in the three forests exhibited a decreasing order as bamboo>mixed wood>coniferous.The SRRs of the three forests were closely correlated with soil temperature(p<0.01)

with Q10values(the ratio of soil respiration change whenever the temperature increase 10℃)2.67

2.19and 2.13respectively.Conversely

the SRRs were not significantly correlated with soil water contents.In addition

the SRRs of all forests without litter cover were smaller than those with litter

indicated by the greater Q10values found in the forests without litter.