CAJ | 학술논문

In this study, the trenching method and infrared gas exchange analyzer were used to research the characteristics of soil respiration in 3 different types of stands including coniferous forest,broad-leaved forest and conifer-broadleaved forest in Lanlingxi small watershed in Three Gorges Reservoir Area of China. The results indicated that the annual total soil respiration ( R total ) ,root respiration ( R root ) ,aboveground litter decomposition ( R lit er ) and soil organic matter (SOM) decomposition (RSOM) of coniferous forest were 1. 61,0. 47,0. 38,0. 76 μmol· m -2 s -1,respectively. The annual Rtotal,Rroot,Rliter andRSOMwere 1.47,0.35,0.16,0.96 μmol·m -2 s -1 for broad-leaved forest and 2.04,0.76, 0. 48,0. 80 μmol·m -2 s -1 for conifer-broadleaved forest,respectively. The respiration rates of soil and its components displayed obvious seasonal dynamics with maximum rate in summer and minimum rate in winter. Soil temperature was the main factor that affected soil and its components respiration rates, and there were significant positive exponential relationships between them (P<0.05). The annual Q10of Rtotal,Rroot,Rliter and RSOMwere 2.01,1.52,2.73 and 3.03 for coniferous forest,2. 51,1. 42,3. 46,3. 08 for broad-leaved forest and 1. 86,1. 14,3. 00,2. 32 for conifer-broadleaved forest,respectively. These results suggested that the annual Q10 value of Rroot in the three types of stands was significantly lower than that of the total soil respiration and its other components respiration ( P<0 . 05 ) .