Báo cáo lâm nghiệp: " Comparison of three methods to determine optimal road spacing for forwarder-type logging operations" pdf

... formulas. Comparison of three methods to determine optimal road spacing for forwarder-type logging operations M. R. G 1 , K. S 1 , J. S 2 1 Department of Forest and Soil Sciences, ... e total cost summary and road spacing for one-way forwarding using the forwarding model Forwarding cost (/m 3 ) Road cost (/m 3 ) Total cost (/m 3 ) C...

Ngày tải lên: 07/08/2014, 04:20

... exp(– λ/c) (18) Statistical criteria For quantitative comparison of different estima- tors, mean square error (MSE) was used to test the estimators of the three methods by the 256 diameter frequency ... evaluation of percentile and maximum likelihood estimators of Weibull parameters. Forest Science, 31: 260–268. ZHANG L., PACKARD K.C., LIU C., 2003. A comparison of e...

Ngày tải lên: 07/08/2014, 10:22

... [18] estimates of aboveground biomass for the three types of for- est corresponding to our studied sites are 295 Mg ha −1 (tropi- cal wet forest), 175 Mg ha −1 (temperate broadleaf forest) and 105 ... – To face the lack of information of C content in the main forest ecosystems pools from Spain and Latin America, this study compares C pools of three forest ecosystems: a t...

Ngày tải lên: 07/08/2014, 16:20

... 2006. Factors influencing distribution of different Al forms in forest soils of the Jizerské hory Mts. Journal of Forest Science (Special Issue), 52: 87–92. NOVÁK J., SLODIČÁK M., 2004. Růstová reakce ... influence of selected factors on the biomass production of the Calamagrostis arundinacea species in the conditions of submountain beech forests. Lesnictví-Forestry, 44: 145–15...

Ngày tải lên: 07/08/2014, 03:22

... 7–24. HANSEN E.M., DELATOUR C., 1999. Phytophthora species in oak forests of north-east France. Annals of Forest Sci- ence, 56: 539–547. HENNON P.E., 1995. Are heart rot fungi major factors of disturbance ... the herb layer. In total, 48 trees of Q. polycarpa and 48 trees of Q. dalechampii were measured. Only mature trees reaching the main storey of the forest canopy were use...

Ngày tải lên: 07/08/2014, 03:22

... waters Parameter to determine Method Instrumentation K, Mg, Ca atomic absorption spectrophotometry AA 30 F4 VARIAN atomic absorption spectrophotometer NH 4 spectrophotometry at the wave-length of 655 ... consequen- tial conflux of water below the canopy was lower and the interception of horizontal precipitation was Table 3. List of methods and instruments used for the analy...

Ngày tải lên: 07/08/2014, 04:20

... interest. It is one of the most suitable methods of its economic utilization. e extent of area suitable for forestation is estimated to about tens or hundreds thousands of hectares (K, ... growths. Keywords: ectotrophic stability of forest; species spectrum of macromycetes; mycorrhizae; former farm land; health status of spruce 458 J. FOR. SCI., 55, 2009 (10):...

Ngày tải lên: 07/08/2014, 04:20

... relations calculated for various methods of forest land maintenance. e aim of research and methodology e aim of presented research was to find out the costs of basic methods of forest land maintenance ... the whole Czech Republic, i.e. for the area of 2,797 ha of forest lands. e goal of this survey is to use the results for making a deci- sion which method...

Ngày tải lên: 07/08/2014, 10:21

... 800 ms were applied for these measurements. e reaction of assimilatory organs to changing light intensity was determined in the same samples of needles. e intensity of photosynthetically active ... of plants to toler- ate environmental stresses and data showing to what extent these stresses cause damage to the photosyn- thetic apparatus (M, J 2000). Even tho...

Ngày tải lên: 07/08/2014, 10:22

... Influence of mass trapping on the population dynamic and damage-effect of bark beetles. Journal of Applied Entomol- ogy, 114: 103–109. J R., B M. 2002): Influence of proportion of (4S)-cisverbenol ... 609–613 Comparison of two types of ECOLURE lure on Ips typographus (L.) (Coleoptera: Scolytidae) O. N 1 , J. S 2 1 Department of Forest Protection and Ga...

Ngày tải lên: 07/08/2014, 10:22