Báo cáo lâm nghiệp: "Application of digital elevation model for mapping vegetation tiers" pdf

... Ministry of Education, Youth and Sports of the Czech Republic, Project No. MSM 6215648902. Application of digital elevation model for mapping vegetation tiers D. V Department of Forest ... additive model by which the smooth surface of vegetation tiers is fitted are statistically significant; the deviation explained by the model (D 2 ) is 0.49. Model for...

Ngày tải lên: 07/08/2014, 10:21

... photogrammetric software. In this context the basic digital forest map is cre- ated today and in the forefront is the transforma- tion of basic forest maps from an analogue form to a digital form. Progress ... outputs. e objective of the submitted paper is to evaluate the availability of digital photogrammetry for the forestry mapping rationalization. Digital photogramm...

Ngày tải lên: 07/08/2014, 03:22

... 16.4–12.8% defoliation of birch and the summer 17.8–12.6% loss of assimila- tory area (K, P 2007). Stands of birch differed under the effect of liming in the total loss of assimilatory area ... the content of some elements as well as the vitality of trees are changed. Changes in the chem- istry of assimilatory organs of birch (Betula pendula Roth) after the appl...

Ngày tải lên: 07/08/2014, 10:22

... on the future of the system providing information for decision-making [13, 29]. According to García [14], the basic elements of these types of models are: a description of the forest state at ... variance of the model which value is obtained as follow: . The cross-validation of each model was based on the analysis of the bias, the root mean square error of the estimates...

Ngày tải lên: 08/08/2014, 01:21

... mechanism of forest fuel, promoting the formation of char and water, and producing less volatile flammable prod- ucts. Therefore, the increase of pyrolysis mass residue on the presence of fire ... pro- moting the formation of char and water, decreasing the amount of heat and slowing the fire progression [10]. The study of the effect of various fire retardant chemicals on the...

Ngày tải lên: 08/08/2014, 01:22

... multiplicative model based on the law of limiting factors was selected as a basic model form. This model form has been used previously in forest yield modeling [10, 25]. Equations for basal area ... regeneration, growth, form, and yield of forest stands, Investig. Agrar., Sist. Recur. For. 1 (2000) 121–145. [30] Valkonen S., Ruuska J., Siipilehto J., Effect of retained trees on...

Ngày tải lên: 08/08/2014, 01:22

... inocu- lation (31 May-6 June). An early symptom of canker formation was the darkening of the bark. In the fourth week (6-13 June) chlorosis of the leaves appeared, and the plants ... depression of the stem, owing to the necrosis of the bark and vascular tissues. They averaged 10 cm in length at the end of the experiment. The stem diam...

Ngày tải lên: 08/08/2014, 18:21

... treatment, transpiration of the shrub was high at low humidity and vice versa. High rates of transpiration caused a decrease in leaf water potential of the whole shrub, and ... potential is a controlling factor for stomatal aperture. It was surprising to see that the leaf conduc- tance of the single leaf was independent of its leaf water...

Ngày tải lên: 09/08/2014, 04:20

... fitting of reduced and full models. For the height-diameter model, the reduced model corresponds to the same set of parameters for the two ecoregions. The full model corresponds to different sets of ... SSE R is the error sum of squares of the reduced model; SSE F is the error sum of squares of the full model; df R and df F are the degrees of freedom of the re...

Ngày tải lên: 08/08/2014, 00:22

... simulation software of silvicultural treatments. These models have been for a long time “tools of experts”, built and used by researchers or experts. Now, they are often put together end to end into soft- ware ... work on the structure and form of these models to ensure that they exhibit a consistent behavior in simulation software. Firstly to account for validity limits of model...

Ngày tải lên: 08/08/2014, 01:21