(Analytical System Model of
Growth Dynamic and Yield Regulation
for Logged-over Swamp Forest in Riau)
Oleh/By
:
Abstract
This study was aimed to build
model of stand structure dynamic and yield regulation for logged-over
uneven-aged swamp forest in Riau Province. Dynamic model of stand structure was
developed based on a series data of permanent sampling plot and yield
regulation method which was developed based on system analysis model approach.
Logged-over natural forest in the concession area of PT. Diamond Raya Timber,
Riau Province was selected for analysing the stand structure dynamic which consists
of ingrowth, upgrowth and mortality functions. The model was constructed based
on species group (Dipterocarpaceae, Non-Dipterocarpaceae and Non-Commercial). The
result indicated that silviculture treatments (thinning and liberation) increased
stand diameter. Average diameter increment in 3-10 years after timber cutting
at permanent plot with silvicultural treatment was 0,43 cm/year and 0,37
cm/year wihout treatments. The result of simulation showed that cutting cycle
35 years decreased the Number of trees for cutting and unsustainable. The increasing
of cutting cycle up to 40 years or the decrease diameter cutting limit to 40 cm
was an alternative of yield regulation for sustainable yield management.
Keywords : model, stand structure, logged-over
forest, analytical system, yield regulation
Abstrak
Penelitian
ini bertujuan untuk membangun model analisis sistem dinamika struktur tegakan
dan pengaturan hasil hutan rawa tidak seumur di Riau. Model disusun berdasarkan pada seri data petak
ukur permanen di hutan alam bekas tebangan pada areal pengusahaan hutan PT.
Diamond Raya Timber, Provinsi Riau. Dinamika struktur tegakan terdiri atas ingrowth,
upgrowth, dan mortality. Model yang dibangun didasarkan pada
kelompok jenis (Dipterocarpaceae, Non-Dipterocarpaceae dan Non-Komersial). Hasil simulasi menunjukkan bahwa dengan
siklus tebang 35 tahun, tegakan pada siklus tebang kedua belum mencapai kondisi
semula. Memperpanjang siklus tebang hingga 40 tahun atau menurunkan
limit diameter hingga kelas diameter 40 merupakan alternatif untuk menjaga
kelestarian hasil. Siklus tebang yang semakin panjang ini juga didukung oleh riap
diameter yang lebih kecil dari 1 cm/tahun yang menjadi dasar penetapan siklus
tebang 35 tahun.
Kata kunci : model, struktur tegakan, hutan bekas tebangan,
analisis sistem, pengaturan hasil
oke
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