LIMIT DIAMETER DAN KUALITA KAYU DI RUTAN ALAM PRODUKSI DENGAN SISTEM SILVIKULTUR TEBANG PILIH (Limit Diameter and Timber Quality in Natural Production Forest by Selective Cutting Silvicultural System)

• Main Author: , Nunuk Supriyatno
• Format: Article NonPeerReviewed
• Published: [Yogyakarta] : Fak. Kehutanan UGM 2000
• Online Access: https://repository.ugm.ac.id/94703/; http://repository.ugm.ac.id/digitasi/index.php?module=cari_hasil_full&idbuku=2502
• Institution: Universitas Gadjah Mada

<p>Natural production forests in Indonesia are dominated by mixed dipterocarp forests and selectively<br /> harveSted under the Tebang Pilih Tanam Indonesia (Indonesian Selective Cutting and Planting<br /> System) or TPTI. Under this system it is allowed to harvest all commercial mature trees with a diameter<br /> limit of 50 cm dbh in the production forest and of 60 cm dbh in the limited production forest with a<br /> cutting cycle of35 years.<br /> At the diameter limit of 50 cm more number of harvestable trees and timber could be produced,<br /> consequently more timber could be extracted. but its quality is relatively low.Timber extracted from a<br /> tree with diameter class of 50-59 cm could not principally be categorised into first or prime grade,<br /> although the timber is actually very good without any defect. Small mature trees (dbh 50 to 59 cm)<br /> yielded on average only 3.1 mJ/tree, ranged from 1.6 to 5.2 mJ/tree, with a log quality according to<br /> Indonesian Grading Rule for Round Timber (JGR) commonly third or local grade, only a little portion<br /> (about 18%)could be categorised to second grade.<br /> In order to produce timber with a biggerdimension and higher quality the existing diameter limitof<br /> tree to be harvest (SOcm) should be raised. Raising the diameter limit of trees to be cut can lead to higher<br /> volume of each extracted tree and their timber quality will be also better. Furthermore, theoretically the<br /> cutting cycle could even be reduced.</p>