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Rahardjo S Suparto
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Journal : Jurnal Penelitian Hasil Hutan

 1 
PENGARUH KERUSAKAN DAN KELERENGAN JALAN HUTAN TERHADAP PRODUKTIVITAS PENGANGKUTAN KAYU STUDI KASUS DI KALIMANTAN BARAT S Sutopo; Rahardjo S Suparto
Jurnal Penelitian Hasil Hutan Vol 5, No 7 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3243.007 KB) | DOI: 10.20886/jphh.1988.5.7.420-424

Abstract

Timber transportation   productivity  decreases  when  forest  road  is  deteriorated   and  the  8lope  is large. This  study tried  to  investigate  the  effect  of  slope  and road  damage  on  timber  transportation  productivity,  and was carried out at the PT Sari Bumi  Kusuma  forest  company   areas in  West Kalimantan in  1987.The  investigation   results are as follows:Slope difference of  5% has significant   effect  on  transportation  productivity.  On  flat,   medium   and  steep  slopes, the productivities  are 265,   219 and  132  m3.  km/hr,   respectively.Transportation   productivity  is significantly influenced   by  a difference  of  15% damage  on  the  road. Productivities on  relatively   good  road, medium damaged  and  badly  damaged  roads  are  292,213  and  136 m3.km/hr, respectively.On flat  and  badly  damaged  roads  (at a damage  level greater  than  30%),   transportation  productivity  is reduced  64% which  caused  significant   financial  loss.  The  allowable  road damage  on  (at  terrain  without   causing financial  loss is 40%.On  medium   terrain  and  medium   damaged  roads  (at  damage  levels  between 15% and  30%), the  loss is significant. Medium damaged  (between 15%  and  30%) and heavy  damaged roads (greater than 30%) caused  transportation productivities  to  be decreased  as much as 25% and 58%,  respectively,   The allowable  road damage on medium   terrain without   causing financial  loss is 26%.On steep  terrain,   transportation   productivity is decreased  significantly i.e. 58% of  those on medium  damaged  roads (between   15% and  30%).  A  maximum   road damage  of  18%  is allowable  without  causing financial  loss.There  is  a significanf   interaction   between  slope  and road  damage.  The  steeper  the  slope  and  the  heavier  the  road damage,  the  larger  the  decrease in  transportation   productivity.In  the  transportation   distance of 60 km  and  the  timber  price  of  US$ 70/m3,  if timber  transportation  productivity decreases 30%,  it is strongly  suggested  to  repair damaged  road  immediatly   in order  to prevent   financial  losses.
PENGARUH PENYARADAN KAYU DENGAN TRAKTOR RANTAI KELABANG TERHADAP KERUSAKAN TEGAKAN TINGGAL Maman Mansyur Idris; Yahya Fakuara; Gunarwan Suratmo; Rahardjo S Suparto
Jurnal Penelitian Hasil Hutan Vol 5, No 7 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.7.404-409

Abstract

The  study   of  the  effect  of  log skidding  on  the  damage  of  residual stand  was carried out in one  logging company in West Kalimantan   in  1986.   The  meaning  of  residual stand  in the  study  are trees with diameter  20 cm and up.  The result of the study   shows  that  the  average damage  of  residual stand  is 18% per  hectare,  not  included  the damage  caused  by felling i.e.  15%  per  hectare.  According   lo  Indonesian   Selective  Cutting  System,  the  residual stand  is good  enough  to  fulfill  the sustained  yield  condition, that  is keep  at  least 25  core  trees  to  be left  per hectare. The role of skidded   trees number and stand  density  was significant  effect   on  the  residual stand  damage.
STABILISASI TANAH LIAT DENGAN KAPUR PADA KONSTRUKSI BADAN JALAN HUTAN DI PULAU LAUT Rahardjo S Suparto; S Sutopo
Jurnal Penelitian Hasil Hutan Vol 1, No 2 (1984): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1984.1.2.11-22

Abstract

Subgrade  construction is an important part in forest  road building,  Subgrade soils with a high clay content  could  not be used satisfactorily as forest  road construction material  unless it is treated  to increase its stability.  The improvement of the  physical characteristics of clay  soils  related  to  subgrade  construction  can  be achieved  by  mixing  lime  of certain proportion into   the soil. The purpose of this investigation  is to determine the amount  of lime required for subgrade stabilization  which  have high clay content  in Pulau Laut,  South  Kalimantan The investigation  reveals the following :1.  The  efective  amount   of  lime  stabilization of  soils  is 7 percent of  the dry  weight  of  the  soil, resulting  in the following  physical  properties  :-  Bearing capacity  is 167 kg/cm2 at air dry  condition,-  Percent  of swell is 2.3,-  Plasticity index  is 25.5,  and-  pH is 9.00.2.  Stabilization   with  7 percent  lime is most  effective  for use in forest  road subgrade containing  about  66% clay. 
INTENSITAS TEBANG BAYANG OPTIMUM DALAM PEMELIHARAAN JALAN HUTAN Dulsalam Dulsalam; Rahardjo S Suparto
Jurnal Penelitian Hasil Hutan Vol 4, No 3 (1987): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1987.4.3.45-48

Abstract

Forest roads requires lots of sun and air to keep them dry. These can be obtained by  "shade felling"  of the stand at both sides OJ the road. The problem in this matter is the question  about  the proper felling  intensity  to render adequate sunshine  and air without  undue  overcutting.Logging companies  tend to fell  as many  trees as possible  to ensure enough  opening  to let sunshine  and air in.A  Least  Significant  Difference  (LSD)  test on the data  obtained from the observation  indicate  that felling  intensity  over 50%  does not provide  better result than 31-41%. It is therefore suggested that shade felling intensity  be kepi at 40%  or less to save time,  man power, cost and forest  resource.
PENGARUH PENYARADAN KAYU DENGAN TRAKTOR RANTAI KELABANG TERHADAP PENGGESERAN DAN PEMADATAN TANAH HUTAN Maman Mansyur Idris; Yahya Fakuara; Gunarwan Suratmo; Rahardjo S Suparto
Jurnal Penelitian Hasil Hutan Vol 5, No 7 (1988): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1988.5.7.394-399

Abstract

The study  of  the  effect of  log skidding  by crawler   tractors  on  forest soil displacement  and compaction wall carried out in one logging company in West Kalimantan in 1986.                                                                                                    The  results  of  the study  are as the following  :The  average  volume   of  soil  displacement was 0.06   cu.m/m  of  skid  road,  it  i6 equal  to  0.061 ton/sq.m. This level of soil displacement iis higher  than  the  soil loss tolerance of  0.0002   ton/sq.m.Soil  compaction as indicated  by the average soil bulk  density is  0.16 g/cu.cm.  At this level of compaction, the porosity is 56%  (far  higher  than  10%  minimum   porosity), which  means  that  the growth  of  vegetation   will be still  favourable.The role of  soil  water  content and  slope on forest soil displacement was positively   significant. The  role of skidding intensity on forest  soil  compaction   was positively   significant   and  the  role  of soil  water  content   and slope  on forest soil  compaction was negatively  significant.
Co-Authors Dulsalam Dulsalam Gunarwan Suratmo Maman Mansyur Idris S Sutopo Yahya Fakuara