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All Journal Indonesian Journal of Forestry Research ULIN: Jurnal Hutan Tropis JOURNAL OF WETLANDS ENVIRONMENTAL MANAGEMENT
Yuniawati Yuniawati
Forest Product Research and Development Center
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Environmental Science

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MONITORING A CONDITION OF RECOVERY OF RESIDUAL STAND AND LOGGED OVER AREA AFTER 5 YEARS RIL IMPLEMENTATION: A CASE STUDY AT A FOREST COMPANY IN CENTRAL KALIMANTAN Sukanda Sukanda; Yuniawati Yuniawati; Sona Suhartana
Indonesian Journal of Forestry Research Vol 4, No 1 (2007): Journal of Forestry Research
Publisher : Secretariat of Agency for Standardization of Environment and Forestry Instruments

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2007.4.1.45-51

Abstract

The aim of this study were to identify and evaluate a condition in logged over area (LOA) after 5 years of reduced impact logging (RIL) implementation, and to asses how far recovery of former skidding road, damages in felled and yarded over area, and environmental condition had taken place. Results of this study was expected to provide inputs and to improve the RIL implementation guidance for sending   sustainable forest management. The results revealed that: (1)The covers of skidding road reached consecutively 2,641 m2  area (in block I), and 3,147 m2  area (in block II), as both marked by the growing of  bushes with coverage portions i.e. 84% and 80%, respectively; (2) The bush that grew on the former skidding road was regarded as pioneer vegetation; (3) The effect of cross drain on skidding road after logging was able to decrease erosion, and increase the recovery of the road condition; and (4) The healthy residual stand after 5 years logging by RIL showed that small diameter felled trees have resulted bigger residual stand damaged then big diameter or the percentage of healthy trees would be small.
Pengaruh Waktu Kupas dan Volume Kayu Terhadap Produktivitas dan Biaya Pengupasan Kulit Kayu Hutan Alam Sona Suhartana; Yuniawati Yuniawati
ULIN: Jurnal Hutan Tropis Vol 5, No 2 (2021)
Publisher : Fakultas Kehutanan Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.408 KB) | DOI: 10.32522/ujht.v5i2.6155

Abstract

Debarking is the activities in the loading point after bucking. The purpose of debarking is to clean wood from bark and reduce the wood moisture content to be easier for further handling. The research method was carried out by selecting the location of 2 loading points where debarking was done, measuring the debarking time and the log volume, and then analyzing the effect of debarking time and log volume on the productivity of debarking with multiple regression analysis. The results showed that: 1)  The average debarking produkctivity in loading point 1 was 21.12 m3/hr an average debarking time of 25.49 minutes and log volume of 9.16 m3; 2) The average productivity of debarking in the second loading point was 20.77 m3/hr with an average debarking time of 19.45 minutes and a log volume of 6.81 m3; 3)The average of debarking cost at loading point #1 is lower than at loading point#2; 4) The resulting regression equation model is Y = 20,931.001 – 49,516.314 X1 + 2.324 X2; and 5)The log volume is significant to debarking productivity, while the debarking time is negative
The Effect of Timber Harvesting on Fluctuation of Peat Water Level and Subsidence of Peat-Soil Surface Sona Suhartana; Yuniawati Yuniawati
Journal of Wetlands Environmental Management Vol 6, No 2 (2018): July-December
Publisher : Center for Journal Management and Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (532.772 KB) | DOI: 10.20527/jwem.v6i2.178

Abstract

A goal of timber harvesting is to increase timber production through removing the timber  from the forest using some harvesting techniques.  A peatland is a fragile ecosystem and may degraded easily. Logging activities may adversely affect the soil compactness that disrupt the peat drainage system as well as cause subsidence, then ultimately may cause the sustainability of peat.  This study was focused on examining the effect of timber harvesting acivities in peat forest plantation.  The peatland damage may in the form of increased bulk density, water level fluctuations of peat (TMA), subsidence, irreversible and carbon emissions.  The objective of the  study is to find out the effect of timber harvesting in peatland plantations to peat water fluctuations and subsidence.  The results showed that logging activites caused : (1) The average of water table and water level are about 1.03 and 0.967 m; and (2) Subsidence about -8 to -12.5 cm with the average is -11.0 cm. 
Co-Authors Sona Suhartana Sukanda Sukanda