| Summary: | The principal of sustained yield that one of them described as a normal
forest is difficult to achieve, because there is always a risk of damage in forest
management. Sustained yield principle is focus on an equal yield annually of
timber. This research aims to test the sustainability of timber production which
based on the forest class structure and timber production for the next six-term
prediction in the future.
This research was conducted in KPH Randublatung, Perum Perhutani Unit
I Jawa Tengah. The prediction of forest class structure and timber production are
based on three factors : sustainability levels, addition age classes of KU I and
addition MR area.
This research showed KPH Randublatung sustainability level of forest
approximately is 75,4%, the addition age classes of KU I and addition MR area is
about 55,0% and 16,0%. The results of the six-term prediction of future shows
that the productive forest class structure has gradually constant change from term
to term, but the widespread deployment among the forest classes is less prevalent.
The annual cutting prediction results which used the 1974 Instructions method
shows that results are inconsistent with the potency of productive logging on
prediction results, while the Casualty Per Cent method tends to appropriate. Based
on overall results of the prediction, KPH Randublatung did not reach the sustained
yield level on the six-term in the future.
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