Dinamika Karbon Hutan Alam Dipterokarpa Dataran Rendah Dalam Sistem Silvikultur TPTI Baru di Kalimantan Tengah

Indrajaya, Yonky

doi:10.20886/jped.2015.1.1.29-40

Cited by 2 publications

(2 citation statements)

References 8 publications

(13 reference statements)

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“…The results showed that the distribution of trees would decrease in the large diameter class, which forms an inverted J-shaped curve following a negative exponential pattern. In tropical natural forests, the stand structure will generally decrease with increasing diameter class (Abdurachman and Susanty 2014;Heriyanto et al 2020;Indrajaya 2015;Sukarna et al 2022). The basal area value in the mixed timber and non-commercial timber groups increased as the diameter class increased.…”

Section: Stand Structurementioning

confidence: 99%

Stand Structure Dynamic of Logged Over Forest after Selective Timber Harvesting in Boven Digoel, Papua

Permata

Kuncahyo

Krisnawati³

et al. 2023

J. Sylva Lestari

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Logged-over natural forest has a different stand structure and composition from primary natural forest due to logging activities. This study aimed to examine forest dynamics (upgrowth, ingrowth, and mortality) of the logged-over forest in PT. Tunas Timber Lestari (TTL) Papua in both stands with and without treatments. The data used in this study were based on the measurement in the Permanent Measurement Plots (PUP) for ten years. This study grouped data into five diameter classes of 10 cm intervals and three wood species groups (meranti timber, mixed timber, and non-commercial timber). Data analysis was carried out by forming a stand structure model and calculating the rate of ingrowth, upgrowth, and mortality. The stand structure model for each species group in stands with treatment had a significant R² value compared to those without treatment. The average ingrowth rate in the stands with treatment was smaller than without treatment. The values of upgrowth varied with the increase in diameter classes for both stands with and without treatments. The mortality rate in stands without treatment tended to be higher, especially in mixed timber and non-commercial timber groups. In contrast, in the meranti timber group, the mortality rate mostly occurred in the stands with treatment. The stand structure models resulting in this study can be used as important information in determining appropriate silvicultural options for forest stands. Keywords: Forest dynamics, logged-over forest, meranti, selective logging

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Section: Stand Structurementioning

confidence: 99%

Stand Structure Dynamic of Logged Over Forest after Selective Timber Harvesting in Boven Digoel, Papua

Permata

Kuncahyo

Krisnawati³

et al. 2023

J. Sylva Lestari

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“…Berdasarkan data rata-rata riap diameter jenis komersial pada setiap kelas dan lokasi yang diperoleh dari penelitian ini, maka besarnya diameter yang dapat dicapai setelah t tahun pengukuran untuk berbagai nilai t dan diameter awal dapat dihitung (Tabel 3). (Indrajaya, 2015). López et al (2013) menyebutkan bahwa untuk rotasi tebang pada hutan tropis harus dinaikkan empat hingga lima kali lebih lama daripada yang dipraktekkan saat ini.…”

Section: Pendugaan Diameter Pohonunclassified

Diameter Increment of Remnant Stands in Logged-Over Forest in Papua

Kuswandi¹,

Nugroho

2019

JWAS

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Riap diameter merupakan informasi yang sangat penting dalam pengelolaan hutan lestari yang dapat dipergunakan untuk menentukan preskripsi silvikultur yang akan diterapkan. Penelitian ini bertujuan untuk mendapatkan besarnya riap diameter tegakan hutan alam bekas tebangan berdasarkan petak ukur permanen di Papua. Pengamatan dilakukan pada areal Ijin Usaha Pemanfaatan Hasil hutan Kayu (IUPHHK) PT Tunas Timber Lestari (TTL), PT Wapoga Mutiara Timber (WMT) dan PT Manokwari Mandiri Lestari (MML). Pengukuran diameter dilakukan setiap tahun selama 6-9 tahun pada tiga petak ukur permanen, dengan luas masing-masing petak 1 ha. Perhitungan riap diameter adalah dengan cara menghitung selisih antara pengukuran diameter pohon pada tahun ke-t+1 dengan pengukuran diameter pohon pada tahun ke-t. Hasil penelitian menunjukkan rata-rata riap diameter pada PT TTL, PT WMT, dan PT MML untuk kelompok jenis komersial berturut-turut sebesar 0,56 cm/th, 0,59 cm/th dan 0,65 cm/th. Riap diameter ini lebih kecil dari asumsi riap Tebang Pilih Tanam Indonesia (TPTI) 1,00 cm/th. Sebaran riap diameter berdasarkan kelas diameter menunjukkan pola yang berbeda antar lokasi. Pola sebaran riap diameter pada PT MML dan WMT meningkat sejalan dengan bertambahnya diameter, sebaliknya pada PT TTL cenderung menurun dengan meningkatnya kelas diameter. Kata kunci: hutan bekas tebangan, kelompok jenis, Papua, riap diameter ABSTRACT Diameter increment is an important information used to set silvicultural prescription that plays a crucial role in sustainable forest management. Therefore, this research was aimed to analyze diameter increment of remnant stands in selectively logged forest in Papua. The dataset was acquired from permanent sample plots in logging concessions of PT Tunas Timber Lestari (TTL), PT Wapoga Mutiara Timber (WMT) dan PT Manokwari Mandiri Lestari (MML). The diameter measurements were conducted annually for 6-9 years on three 1 ha permanent plots. Diameter increment was calculated by measuring a gap between trees diameter in year t+1 and year t. The results showed that the average diameter increment of commercial species groups in those areas were 0.56 cm/yr, 0.59 cm/yr and 0.65 cm/yr, respectively. These increments were smaller than the increment assumption of Indonesian Selective Logging (TPTI) i.e. 1.00 cm/yr. The diameter increment distribution based on diameter classes showed different patterns among sites. The diameter increment distribution in PT MML and WMT increased with the increasing diameter, otherwise those in PT TTL tend to decrease with the increasing diameter class.

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Dinamika Karbon Hutan Alam Dipterokarpa Dataran Rendah Dalam Sistem Silvikultur TPTI Baru di Kalimantan Tengah

Cited by 2 publications

References 8 publications

Stand Structure Dynamic of Logged Over Forest after Selective Timber Harvesting in Boven Digoel, Papua

Stand Structure Dynamic of Logged Over Forest after Selective Timber Harvesting in Boven Digoel, Papua

Diameter Increment of Remnant Stands in Logged-Over Forest in Papua

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