Tarif isi pohon untuk jenis Agathis loranthifolia Salisb di Kesatuan Pemangkuan Hutan Banyumas Barat, Jawa Tengah
Siswanto, B.-Edy; Krisnawati, H.
Buletin Penelitian Hutan 615: 1-7
1998
Document Number: 362080
A tree volume tariff was developed for Agathis loranthifolia Salisb in the region of Banyumas Barat Forest District, Central Java. The tariff is for predicting inside bark tree volume up to 7 cm top diameter. The tariff was based on an allometric regression equation relating tree volume to tree diameter at breast height (dbh). There were totally 70 sample trees of various dbh. Tree volumes were measured by measuring tree sections, and section volumes were calculated using Smalian formula. The resulting regression equation is: V=0,1423 D2,4546 or logV=-0,8468+24546 logD where: V=volume of trees (m3), D=dbh (cm), a and b=constant. The standard error of estimate is 1,3% and the aggregative deviation and average deviation are respectively 0,51% and 11,5%. These figures indicate that the resulting tree volume equations is sufficiently reliable.