Abstract
Tropical rainforests have very important functions such as hydrological functions, ecology, economic and social. However, the existence of forest harvesting activities potentially decrease the function. Implementation of poor forest management, causing damages resulting from harvesting processes such as canopy exposure, areal exposure and damage to residual stands. Based on the description it is necessary to do research on the analysis of canopy exposure in natural rain forest area IUPHHK-HA PT. Batasan Camp Tontang. This study aims to determine the extent of canopy exposure due to harvesting activities and to know the relationship between the width of the basic fields of cut down trees per hectare to the exposure of the canopy. This research was conducted on the 2015 RKT and in IUPHHK-HA area of PT.Batasan Camp Tontang,Nanga Serawai Sub-district, Sintang District, West Kalimantan Province. Canopy exposure as a result of harvesting activities is obtained by measuring its openness using a spiracle densiometer tool. The percentage of openness is then analyzed by the equation Y = a + bX, where Y is the percentage of canopy exposure whereas X is the base area of the harvested trees per hectare. To find out the real relationship between the width of the tree base area felled by the openness of the canopy, it is done with the F test and to know the close relationship between variables X with variable Y by closeness relationship test or r test. Timber potential before harvesting in 9 research plots with the tree level average value is 35.78 stems / ha. After harvesting activities, timber potential has decreased due to timber harvesting activities to be 9.33 stems / ha. The percentage of canopy exposure after harvesting activity was 49.35% and included in medium level of exposure. From the calculation results, the equation which is obtained by regression line of the relationship between the width of the base area of the trees cut down per hectare with the value of the canopy expose, shows that the greater tree cutting base area, the greater canopy exposure that occurs.Keyword: Canopy exposure, Degradation, Spiracle Densitometer.
Highlights
PENDAHULUAN Kegiatan pemanenan kayu diperlukan agar kayu dapat dimanfaatkan dan bernilai ekonomis
This study aims to determine the extent of canopy exposure due to harvesting activities and to know the relationship between the width of the basic fields of cut down trees per hectare to the exposure of the canopy
This research was conducted on the 2015 RKT and in IUPHHK-HA area of PT.Batasan Camp Tontang,Nanga Serawai Sub-district, Sintang District, West Kalimantan Province
Summary
Penelitian ini dilaksanakan pada bulan Maret selama 2 bulan di mulai dari tanggal 08 Juni 2015 dan dilakukan pada Blok Tebangan RKT Tahun 2015 Petak L-37. pada areal IUPHHK Hutan Alam PT. Objek yang diteliti adalah semua tegakan tingkat pohon yang tumbuh pada plot penelitian sesudah dilakukan kegiatan pemanenan. Penelitian ini dilakukan pada blok tebangan petak L-37, RKT 2015 yang dibagi ke dalam petak-petak ukur dengan ukuran 100m x 100m (1 ha), sebanyak 9 plot sehingga luas keseluruhan ialah sebesar 9 ha. Data primer diperoleh dari kegiatan langsung di lapangan melalui kegiatan pengukuran tajuk dengan menggunakan alat densiometer serta kegiatan pengamatan dan inventarisasi langsung semua nama jenis, jumlah, dan diameter tunggak untuk tingkat pohon pada plot pengukuran yang telah dibuat. Untuk mencari persentase tajuk.Hubungan Luas Bidang Dasar pohon keterbukaan tajuk, dilakukan pengukuran yang ditebang dengan besarnya dengan menggunakan alat spiracle keterbukaan tajuk ditentukan dengan densiometer. Selanjutnya kondisi tajuk yang variabel Y dilakukan uji keeratan telah diamati dengan menggunakan alat hubungan atau Uji r.
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