Báo cáo lâm nghiệp: "Modelling the biomechanical behaviour of growing trees at the forest stand scale Part I: Development of an Incremental Transfer Matrix Method and application to simplified tree structures" pptx

... 2004 DOI: 10.1051 /forest: 2004019 Original article Modelling the biomechanical behaviour of growing trees at the forest stand scale. Part I: Development of an Incremental Transfer Matrix Method and ... and efficient method to simulate the biomechanical behaviour of growing trees. Nevertheless, the use of numerical methods at th...

Ngày tải lên: 08/08/2014, 01:22

... were related to the relative height of crown base. In other studies on the one hand the mean red heart radius at one fifth of total tree height was found to be related to the distance to the crown ... that the extent and total volume of red heartwood can hardly be estimated with accuracy from the ends of logs [16] or even less in standing trees. Approaches...

Ngày tải lên: 07/08/2014, 16:20

... initialization function for estimating stand basal area at any specific point in time. Since stand basal area depends on the age of the stand and other stand variables (theoretically the productive ... estimation of the pa- rameters of the projection function, substitution of their values into the initialization function, and then fitting the latter to esti...

Ngày tải lên: 07/08/2014, 16:21

... corresponds to a standing volume of 280–290 m 3 /ha, and signifies that at around this stand density, recruitment trees stop growing and the plenter structure is permanently lost. Schütz and Röhnisch ... Dorothea Gerold for allowing free use of the data of their Langula research plots and for advice, further information and interesting debate. Thanks to Andreas...

Ngày tải lên: 08/08/2014, 00:22

... growth ring of the Azereix trees (fig 5), in the 1985 and 1987 annual growth rings of the Doat trees and in the 1963 annual growth rings of the Mixe trees (results ... trees of the Azereix plot because they had a canker of less than 1.5 m height. The disks were air-dried at room temperature and then sanded. Quantificati...

Ngày tải lên: 08/08/2014, 18:21

... by the forest stand (Fig. 2). The important components of the model consist of the subroutines de- scribing light interception and stomatal conductance of the stand. The ... stratification among trees and canopy layers (isebrands and Michael, 1986). Ecophysiological (stomatal conductance and plant water potentia!), climatic and soil mo...

Ngày tải lên: 09/08/2014, 04:20

... taken regarding the different silvicultural treatments that need to be carried out in each of them. At present, due to the state of abandonment and decay in which many of these stands have fallen ... available for an adequate asymptote estimation due to the absence of old stands, probably as a result of the traditional use of Q. pyrenaica stands for firewood and...

Ngày tải lên: 07/08/2014, 16:20

... Mean, standard deviation and range of the main characteristics of the sample trees subjected to stem analysis in the two studied areas (CAT and PNLA). Area n Variable Minimum Maximum Mean Standard ... that the number of fittings was equal to the number of trees. Both the mean of the prediction residuals and the mean of the abso- lute prediction resi...

Ngày tải lên: 08/08/2014, 00:22

... one get the slope for each stand: –0.63 (stand 1); –1.14 (stand 2); –0.079 (stand 3); –1.12 (stand 4); –1.14 (stand 5). Firstly, all stands show on average decreasing latewood density in the adult ... limitation while consistently and efficiently estimating the transition point for the whole sample. Furthermore standard errors can be calculated and impacts of stand and...

Ngày tải lên: 08/08/2014, 01:22

... of the canopy, and the latter is considered as the sum of the stomatal conductance of all the leaves, according to the ’big-leaf’ hypoth- esis. When stand transpiration ... demon- strated to be the most significant climatic variables controlling transpiration, both on hourly and on daily scales. On the other hand, stomatal control...

Ngày tải lên: 08/08/2014, 18:21