Abstract: By using Li-8100, this paper studied the dynamic variations of soil respiration in a Chinese fir plantation in Jianyang of Fujian Province, East China during weather change. The soil respiration rate in the plantation had a similar variation trend with soil temperature, but the peak value of the soil respiration rate occurred at different time under different weather conditions. Normally, the peak value occurred at about 13:00, but appeared at 11:00 when the air temperature and precipitation had obvious change. The diurnal variation range of the soil respiration rate also varied under different weather conditions, being 37.9% and 50.6% at lower temperature and higher temperature, respectively. In companying with great extent of cooling and raining, the soil respiration rate decreased sharply, with the minimum on the fifth day after the weather change, and then increased with rising temperature, taking 10 days from decrease to recover. The soil respiration rate showed a significant positive correlation with the surface soil temperature, and a negative correlation with the soil moisture content.  

Key words: tree layer, shrub layer, herb layer, litter layer, leaf, geographical factor.