Báo cáo lâm nghiệp: "A linkage among whole-stand model, individual-tree model and diameter-distribution model" ppsx

... three broad categories: whole-stand models, individual-tree models, and diameter-distribu- tion models (M 1974). Whole-stand models are models that use the stand as a modelling unit (C ... ABSTRACT: Stand growth and yield models include whole-stand models, individual-tree models and diameter-distri- bution models. In this study, the three models were linked by fore...

Ngày tải lên: 07/08/2014, 10:22

... AND METHODS e study was carried out in 2002 to 2005. Small mammals were sampled using the standard method of line trapping by means of snap traps (P 1975) and combinations of snap and ... flavicollis, A. sylvaticus and Clethrionomys glareolus dominated in these habitats. On the other hand, the populations of insectivores were very low, Crocidura leucodon and C. suaveolens...

Ngày tải lên: 07/08/2014, 03:22

... the middle of sample (Figs. 4 and 5). During the test the width and thickness of the sample, and the distance of supports are measured, and deflection at loading and maximal faulted load- ing ... layer of fibreglass, with a cork core layer and with a cork wear layer on one side of the plywood board and a cork core. Tests of selected physical and mechanical properties were c...

Ngày tải lên: 07/08/2014, 04:20

... Out of the fi ve variograms, 2 were fi tted to the classical spherical model, 2 to the exponential model and 1 to the Gaussian model (Fig. 2).  e analysis of data under the classical RCB design ... environmental factors and height growth and yield of Norway spruce stands: a factor-analytic approach. Forestry, 68: 145–152. G E., A A.S., M A. (2007): Mixed spa...

Ngày tải lên: 07/08/2014, 10:21

... abrasion of the test specimen and filling of the sanding paper with abraded material are checked. e frequency of the sanding paper replacement is Table 1. e initial and final point of abrasion ... 799 standard, being however completed by the procedure of sampling, prepara- tion and air conditioning of samples in such a way that a well-arranged and integrated instruction for stan...

Ngày tải lên: 07/08/2014, 10:21

... stands and 121 in contrast with 101 mg/kg in beech stands in the NFR, Pb = 138 mg/kg in con- trast with 88.6 mg/kg in spruce stands and 93.6 in contrast with 83.3 mg/kg in beech stands ... of organic material between spruce and beech stands or between the stands in the whole NFR and in the Jablunkov Pass. e humus layer is less acid in beech stands, but this is not the cas...

Ngày tải lên: 07/08/2014, 10:21

... majority of stands in the 7 th forest vegetation level should fulfil difficult ecological functions, the soil protection and hydrological ones in particular. A significant part of spruce stands in ... is understandable. On the other hand, the eval- uation in relation to altitude confirmed the effect of climate changes. e value of the Füldner index rises with the ascending altitude and at...

Ngày tải lên: 07/08/2014, 10:22

Ngày tải lên: 07/08/2014, 16:20

... (Ca 2+ ,Mg 2+ ,andK + ) and the canopy exchange of ni- trogen (NO − 3 -N and NH + 4 -N) and H + in the two canopy layers; and (iii) to evaluate the seasonal ionic dry deposition and total deposition ... through- fall, and 4.3 to 7.1 in sub-throughfall during 2002 (Fig. 4). Seasonal mean-pH value were 4.7, 4.3, 5.5, and 4.3 in rainwa- ter, 6.0, 6.6, 6.2, and 4.3 in throughfall...

Ngày tải lên: 07/08/2014, 16:20

... significantly higher in the inland area (p < 0.05). The mean sensitivity and standard deviation for earlywood, latewood and tree-ring widths were higher in the inland area than in the coastal ... m), between 2003 and 2004. In each site at least 5 dominant, old and large stem trees P. pinea were sampled. The increment cores were air dried, mounted on wooden supports and sanded with...

Ngày tải lên: 07/08/2014, 16:20