Báo cáo lâm nghiệp: "A tree crown ratio prediction equation for eucalypt plantations" ppt

... observed crown ratio and the crown ratio values estimated with the logistic, Richards and Weibull functions. A tree crown ratio equation for eucalypt 201 inverse and the number of live trees per ... at base age 10 years; d, tree diameter at breast height; h, total tree height; hbc, tree height to the live crown base; cl, tree crown length; cr, tree crown r...

Ngày tải lên: 09/08/2014, 04:20

... a growth model for forest management using continuous forest inventory data, For. Ecol. Manage. 71 (1995) 251–265. [31] Tennent R.B., Individual -tree growth model for Pinus radiata, N. Z. J. For. Sci. ... is useful for predicting tree heights, for instance in inventory sit- uations when the dominant height and tree diameters are measured, but all trees are not measured by heig...

Ngày tải lên: 08/08/2014, 01:21

... and yield equations for Slash Pine fitted with restrict- ed three-stage least squares. Forest Science, 32: 185–201. B B.E. (1989): Systems of equations in forest stand modeling. Forest Science, ... erefore, this study provided a framework for studying the integrated system of forest models. Acknowledgements e authors would like to thank the Inventory In- stitute of Beijing Fore...

Ngày tải lên: 07/08/2014, 10:22

... calibration sample placed in the same plane as the target tree for calibration. By following the procedure described above, the scaling factors in the horizontal and vertical directions for the ... stem for the 71 Norway spruce trees. photographs and 20 min to analyse) and repeatable means of providing a non-destructive estimate of the 3D profile for a large number of trees in the fo...

Ngày tải lên: 07/08/2014, 16:21

... least for trees with inflexible crowns. However, the author has found no other approach that esti- mates crown radii for different cardinal directions. Thus, the demand for crown asymmetry-information ... crown radii of one tree, the maximum crown extension for the competitor trees j are needed but generally not known. Thus, for a given competitor, r max,j is calculated f...

Ngày tải lên: 08/08/2014, 01:21

... other trees and the rectangle is the 12 -tree sample plot. For G. sepium, the simulated root architecture of a tree is shown, and the ellipses refer to the simu- lated root extension in two other trees ... study, the value of n is 2 for all applications of equations (3) to (8). 2.2. Field observations for model parameterisation 2.2.1. Measurements Field measurements for model param...

Ngày tải lên: 08/08/2014, 01:21

... higher pools and increments for beech forest of comparable ages. The dry matter Table I. Stand forest parameters for the year 2000 (Mund 2001, pers. comm.). Tree density (tree ha –1 ) Basal area ... classic analysis in forestry. The equations adopted by tReeglia assume that tree profile can be identified by an Apollonius paraboloid [19]. The program employs the trapezium formula to...

Ngày tải lên: 08/08/2014, 01:22

... root-plant ratio is one of the important parameters for planting stock quality. We suppose that the ratio is one of the driving variables for the growth performance of new plantation in the forest. ... Republic (A-  2005). Forest Act No. 289/1995 lays down to perform the regeneration of forest land after final cut within a 2-year period and to get the new reforestation in “...

Ngày tải lên: 07/08/2014, 03:22

... traps led in a trees cropping mast oak forest, one line in a young oak stand, one in a spruce forest, one in a pine forest and one at a forest edge. As to sample the particular forests, trapping ... biotope for free- living higher vertebrates characterized by the high diversity of sites, high concentration of pheasants and high amount of supplementary food in the form of feeding for...

Ngày tải lên: 07/08/2014, 03:22

... stresses for some wood compos- ites used in furniture. Holz als Roh und Werkstoff, 54: 377–382. HRÁZSKÝ J., KRÁL P., 2004. Analysis of properties of boards for concrete formwork. Journal of Forest ... Loading diagram for the determination of modulus of elasticity 0.4 F max 0.1 F max F 2 F 1 a) ↑ a 1 b)→ a 2 J. FOR. SCI., 53, 2007 (10): 483–490 489 previous type. ey can be used...

Ngày tải lên: 07/08/2014, 04:20