Model Tajuk Jati (Tectona Grandis L.f) dari Berbagai Famili pada Uji Keturunan Umur 9 Tahun
Abstract: Crown plays an
important role in regulating the rate of tree growth through the photosynthesis
process. Furthermore it can be used to measure stand density and to determine
the availability of growing space. Because of the difficulty and time consuming in direct crown
measurement, the development of crown model is needed. The objectives of this
study were to develop crown models of teak (Tectona grandis) of 9 years old
from selected open pollinated families and to identifi) the variations of crown
models among them.
The study was conducted in an open pollinated progeny test located at the
compartment 49a, RPH Sidowayah, BKPH Kedunggalar, KPH Ngawi. The experimental
unit was family. Five families with the best average of stem diameter at breast
height were selected as samples. Crown models were developed and variations of
crown model were tested with analysis of variance.
The crown model of teak can be divided into two sections. The upper crown
representing the light crown section followed parabolic model while the under
crown representing the shaded crown section followed linear model. No
differences in crown model were found among families. The proposed models are:
light crown section, paraboloid : Rl =1.91 * hl0.33
shaded crown section, linear .. Rs = -0.75 + 0.57 hs
where Rl is light crown radius (m), hl is the height of light crown
section (m), Rs is shaded crown radius (m) and hs is the height of shaded crown
section (m)
Keywords: teak (Tectona
grandis), crown model, family
Penulis: Jany T. Raharjo,
Ronggo Sadono
Kode Jurnal: jpkehutanandd080003
