Penentuan Tingkat Kompetisi Tajuk Tegakan Jati Hasil Uji Keturunan Umur 11 Tahun di KPH Ngawi
Abstract: The increasing
demand of teak wood should be followed by the increasing of teak forest
productivity through intensive silviculture, especially growing space
manipulation. The main objective of this research was to determine the growing
space competition.
The material was measurement data from eleven year progeny test located
at the compartment 49a, RPH Sidowayah, BKPH Kedunggalar, KPH Ngawi. The growing
space competition was calculated using Hegyi’s competition index. Superior
trees were selected to determine competition zone of the subject tree and this
result was proposed to calculate the competition index of all trees. Based on
the correlation between competition index and tree height, vertical structure
was then classified using k-means cluster.
Based on 300 superior trees, the competition zone could be determined
using reference angle of 66°. The competition index was vary in between 0.00
and 4.23 with average value of 1.18. The correlation between the index and the
tree height was found to be low with r = -0.227. Based on this correlation, the
vertical structure was classified into four level namely dominant, co-dominant,
medium, and suppressed respectively.
Keywords: superior tree,
reference angle, competition zone, competition index, vertical structure
Penulis: Ronggo Sadono,
Meifrida Lasmaria Silalahi
Kode Jurnal: jpkehutanandd100008
