Seasonal dynamics of standing crop of energy for fine roots of Casuarina equisetifolia plantations of different ages was studied at Chihu forestry center of Hui’an county,Fujian Province. The results showed that the high levels of standing crop of ash both occurred in March and July for living and dead fine roots for different aged C. equisetifolia plantations; while the standing crop of energy was the relatively highest in March and July for dead fine roots,and that was in January,July and November for living fine roots. The standing crop of ash and energy in living fine roots increased and then decreased with forest age. But the standing crop of ash reached the highest in 24-year-old and the standing crop of energy in 30-year-old plantation. the standing crop of ash and energy in dead fine roots both increased with forest age. So season and forest age would be responsible for the energy fixation.
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