Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2008.1422.1428ParsakhoAidin Ataollah HosseiniSeyed JalilvandHamid LotfalianMajid 1120081111Effects of moisture, porosity and soil bulk density properties,
grubbing time and terrain side slopes on pc 220 komatsu hydraulic excavator
productivity were investigated in Miana forests road construction project
which located in the northern forest of Iran. Soil moisture and porosity
determined by samples were taken from undisturbed soil. The elements of
daily works were measured with a digital stop watch and video camera in
14 observations (days). The road length and cross section profiles after
each 20 m were selected to estimate earthworks volume. Results showed
that the mean production rates for the pc 220 komatsu excavators were
60.13 m3 h-1 and earthwork 14.76 m h-1
when the mean depth of excavation or cutting was 4.27 m3 m-1,
respectively. There was no significant effects (p = 0.5288) from the slope
classes` treatments on productivity, whereas grubbing time, soil moisture,
bulk density and porosity had significantly affected on excavator earthworks
volume (p < 0.0001). Clear difference was showed between the earthwork
length by slope classes (p = 0.0060). Grubbing time (p = 0.2180), soil
moisture (p = 0.1622), bulk density (p = 0.2490) and porosity (p = 0.2159)
had no significant effect on the excavator earthworks length.]]>Abeli, W.S.,199653339Abeli, W.S., D.T.K. Shemwetta, R.E.L. Ole Meiludie and M. Kachwele,2000111522Acar, H.H.,200526121124Balci, C. and N. Bilgin,200744468476Bergroth, J., T. Palander and K. Karha,2006457488Bjorheden, R.,199123339Budny, E., M. Chlosta and W. Gutkowski,200312245254Bulmer, C.,2000133157163Coetzee, C.J., A.H. Basson and P.A. Vermeer,200744177186Demir, M. and M. Hasdemir,200512228Demir, M.,2007415668Page-Dumroese, D.S., R.E. Brown, M.F. Jurgensen and G.D. Mroz,199963379383Edwards, D.J., G.D. Holt and F.C. Harris,200220581591FAO.,19981998Filipsson, S. and L.O. Eriksson,1989138Forman, R.T.T.,2000143135Froelich, H.A., D.W.R. Miles and R.W. Robbins,19854910151017Hosseini, S.A. and H. Jalilvand,20071017661771IUFRO.,1995Johansson, J.,19957717Lotfalian, M., H.S. Daliri and Y. Kooch,20071036683672Lugo, A.E. and H. Gucinski,2000133249262Mahmoodi, S. and M. Hakimian,2001Pinard, M.A., M.G. Barker and J. Tay,2000130213225Reed, R.A., J. Johnson-Barnard and W.L. Baker,19961010981106Saarinen, V.M.,200630349356Akhtar, M.S., A. Hussain, M.A. Naeem and A. Razzaq,20014542549Schiess, P., C.A. Whitaker and C. Zellerbach,1986Towarek, Z.,20034510531076Tunay, M.,200627529535Wang, J. and R. Haarlaa,2002528590Yildiz, O., M. Sarginci, D. Een and K. Cromack,2007Fagus orientalis, Lipsky regeneration in the Western Black Sea Region of Turkey.]]>240186194Zarrinkafsh, M.,1993pp: 361pp: 361