Báo cáo lâm nghiệp: "Modelling the coppice stand structure: an ecophysiological approach" ppsx

... Lamina angle was 88° + 4.27 for standards and coppice pooled together, indicating that the lamina were generally not tilted. The midrib angle was higher for the standards than ... are trees, managed on a longer rotation than the coppice, to produce seeds for the regeneration of the stand. The rotation interval is 18 yr for the coppice...

Ngày tải lên: 09/08/2014, 04:20

... is not always located at the same distance of the pith and their intensity is significantly different for tree T3. These gaps can be explained by the delay or advance of the reaction processes. ... reaction occurs ( ) if its leaning angle is greater than and there is no reaction otherwise ( ). Note that the threshold angle , which is the same for every GU, can be defined for each...

Ngày tải lên: 08/08/2014, 01:22

... land use (coppice with standards) and its status as a communally-owned and -utilised forest [6]. They are sit- uated in the private Langula-Oppershausen corporative forest. There is a long-standing, ... forests and can be explained by the fact that GCUM depicts stand clo- sure differences. The sharp decrease of i d with increasing stand closure (GCUM) for trees in the lower part...

Ngày tải lên: 08/08/2014, 00:22

... because they had a canker of less than 1.5 m height. The disks were air-dried at room temperature and then sanded. Quantification of the annual development of the trunk cankers Figure ... dramatic in Doat than in the other stands. As predicted by the model, a smaller canker development on the northern side of the trunk compared to the...

Ngày tải lên: 08/08/2014, 18:21

... on the age of the stand and other stand variables (theoretically the productive ca- pacity of the site and any other measure of stand density), it is gener- ally necessary to relate X to these ... parameters. Another important step in evaluating the models was to perform graphical analyses of the residuals and the appearance of the fitted curves overlaid on the trajecto...

Ngày tải lên: 07/08/2014, 16:21

... occurs in the stand of larch with beech (52.6 t/ha) and the statistically lowest one in the unmixed beech stand (22.0 t/ha). e mixed stand of spruce with beech and the spruce stand repre- sent ... On the basis of determined results we can conclude that the reserve of the mixed stand of spruce with beech approaches more the unmixed spruce stand than the unm...

Ngày tải lên: 07/08/2014, 03:22

... On the other hand factors like the mean increase of dbh and the num- ber of oxygen entrances were reported to better explain the characteristics of red heartwood (probability, diameter) than the ... the formation of the observed red hearts, i.e. they influenced their height and length, too. Developing approaches to the quantifi- cation of the effect of single dead branches/bran...

Ngày tải lên: 07/08/2014, 16:20

... addition, the stand age and the site index (dominant height at 100 years) of the forest stand are needed. The ini- tial stand data used in this study came from plots measured during the Second Spanish ... stands, and 4.87% for all pine stands. These observations led us to use the range from 0 to 5%, considering the high variability in the fire risk of individual stands....

Ngày tải lên: 08/08/2014, 00:22

... incorporates the influence of aerody- namic and canopy conductances. The for- mer depends on roughness properties of the canopy, and the latter is considered as the sum of the stomatal ... and vapour flow at stand level and derivation of canopy conductance for Scots pine. Theoret Apl Climat (in press) Jarvis PG (1975) Water transfer in...

Ngày tải lên: 08/08/2014, 18:21

... regions of the Czech Republic; (i) Euhercynicum (the Šumava Mts., Slavkovský les, Český les, Brdy Upland and Žďárské vrchy Upland), (ii) Sudeten (the Krkonoše Mts. and the Krušné hory Mts.) and ... Entomology, 23: 99–108. Table 3. Results of the redundancy analysis of explanatory variables, their significance and correlations with the axes Explanatory variable AX1 AX2 AX3 AX4 P...

Ngày tải lên: 07/08/2014, 03:22