Abstract:

According to growth period of forest stand and management pattern, the paper advances the dynamic model to estimate the loss of ecological benefits after the estimating indices have been ascertained to estimate the loss of ecological benefits after forest fire. For 30-year-old Pinus massoniana stand, which has been man-regenerated 45 years after fire, its ecological benefits are simulated, the result show that the optimal decision of forest conservation can bring maximal ecological benefits and only the 30-year-man-forestation stand after fire can get the ecological benefits of non-stricken stand and the total loss of ecological benefits is 25.92 times as much as that counted by traditional method. On the other hand, if the alternating lumber mode about 30-year-felling-cycle is taken, at the 19^th year the ecological benefits is comparative that of man-forestation stand, henceforth the latter can be much more provided with the ecological benefits, and at the 17^th year, the total ecological benefits coming from man-forestation stand is equivalent to the steady comparatively value produced by alternating lumber stand which has been over one rotation. The total benefits of alternate cutting mode will be more than the total ecological benefits of forest reservation in the early six years; but this situation will be changed after the seventh year.

Key words: Pinus massoniana forests, forest fire, loss of ecological benefits, management mode, dynamic estimating