Analysis of the dynamics of soil respiration of Castanea henryi plantation and its major factors

The dynamics of soil respiration of Castanea henryi economy plantation in the north Fujian Province was measured using Li-6400.Results showed that the maximums of soil temperature at 5 cm depth were commonly observed at around 15:00 in different seasons.The maximal rate of soil respiration occurred at 13:00 in spring and winter,but in summer and autumn were 17:00 and 15:00,respectively.Diurnal variations in soil respiration were mostly correlated to that in soil temperature.There was a significantly exponential relationship between soil respiration and soil temperatures at 5 cm depth during the year and each seasons.The maximal soil respiration rate was 4.54 μmol·m-2·s-1 in summer and the minimum was 1.82 μmol·m-2·s-1 in winter.The Q10 values of soil respiration were the highest in winter,and the lowest in summer,respectively,Q10 value declined with the increasing in temperature.