THE EFFECTS OF CONTROLLED SKIDDING TECHNIQUE ON RESIDUAL STAND DAMAGE AND GROUND EXPOSURE IN SWAMP FOREST LOGGING

Author

Sona Suhartana

Abstract

The  case study was  carried  out at a swamp forest company  in Riau in 2001.   The  aim of the study  was to determine  the effect of controlled skidding technique  to residual  stand damage and ground  exposure. Data  collected  includes:  felled trees, poles,   trees with  the diameter 20 cm up, damaged poles, damaged  trees and ground  exposure.  The data was  analyzed with t-test.  The study showed  the following results:

1. The  average of  residual stand  damage caused by controlled  skidding technique  was  29.05% for poles and 19.8%  for trees. The average of residual stand damage caused by conventional skidding technique  was 34.2% for poles and  24.9%   for trees.  The difference  of  5.1%   (poles) and 5.1 % (trees) were significant  at 95%.
2. The  average of ground  exposure  caused by controlled  skidding  technique  and conventionalskidding technique was respectively   16.06% and 18.4%.  The difference of 2.34%  was significant at 95%.

Keywords

controlled skidding technique; residual stand damage; ground exposure

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References

Directorate General of Forest Concession. 1994. Indicator technics of the Indonesian selective cutting and planting at natural land forest. Forestry Department, Jakarta.

Steel, R. G.D. and J.H. Torrie. 1976. Principles and Procedure of Statistics. Mc.Graw-Hill Book Co., New York.

Suhartana, S. 2000. Comparising between manual and excavator skidding system at swamp forest Part I: Work productivity. Forest Products Info 6(1): 31-37. Forest Products Research and Development Center, Bogor.

Suhartana, S., Dulsalam and M.M. Idris. 2000. Comparising between manual and excavator skidding system at swamp forest part II : The effect of the system to residual stand damages and ground exposure. Bulletin of Forest Products Research 17(4):231-241. Forest Products Research and Development Center, Bogor

DOI: http://dx.doi.org/10.20886/ijfr.2004.1.1.1-6

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