摘要：Soil respiration rate in two types of grassland dominated with Zoysia japonica and Miscanthus sinensis, respectively, and under two
management practices (undisturbed and intentionally burned) for the M. sinensis grassland was investigated for understanding the
effects of grassland vegetation type and management practices on the relationship between soil temperature and soil respiration in
northern Japan. Soil temperatures at depth of 1 cm in the Z. japonica (ZJ) and burned M. sinensis (MSb) plots had a larger temporal
variation than that in the control M. sinensis (MSc) plot prior to early July. However, the coefficient of temperature sensitivity (Q10)
values, based on soil respiration rates and soil temperatures at 5 cm depth in the ZJ and MSb plots, were 1.3 and 2.9. These rates
were lower than that in the MSc plot (4.3), meaning that soil respiration showed lower activity to an increase in soil temperature
in the ZJ and MSb plots. In addition, monthly carbon fluxes from soil in these plots were smaller than that in the MSc plot. These
results suggested that artificial disturbance would decrease soil microbial or/and plant root respiration, and it would contribute to
the plant productivity. Future studies should examine the effects of the intensity and period of management on the soil respiration
rate.
