Báo cáo lâm nghiệp: "Paramètres structuraux et/ou ultrastructuraux facteurs de la variabilité intra-arbre de l’anisotropie élastique du bois" pptx

... PRÉVISIONNELS DE L’ANISOTROPIE ÉLASTIQUE Valider la pertinence de la pyramide des modèles introduits au chapitre précédent pose deux classes de problèmes. Il con- vient, d’une part, de disposer de valeurs ... original Paramètres structuraux et/ou ultrastructuraux facteurs de la variabilité intra-arbre de l’anisotropie élastique du bois Daniel GUITARD,...

Ngày tải lên: 08/08/2014, 01:22

... non-damaged individuals were collected. ese in- dividuals were put into refrigerator into wet envi- ronment and later transported to lab. After several days, the number of individuals was enough ... individuals were taken away each day. Storing the emerged individuals. e emer- gence of individuals usually takes longer time. e manipulated experiments requested several hun- dred individua...

Ngày tải lên: 07/08/2014, 03:22

... meet the demands of industry, coniferous species were preferred due to their faster increment and therefore, Norway spruce in the mountains and Scots pine in the lowland were usually planted. ... přeměna různé ekonomické výsledky. Za účelem snížení nákladů na tento proces byla provedena analýza na základě potenciálních příjmů z prodeje dřeva. Cílem analýzy bylo najít optimální čas pro ......

Ngày tải lên: 07/08/2014, 03:22

... e flooded oak seedlings dem- onstrated a strong reduction in growth increment in comparison with similar aged, non-flooded seedlings grown under slightly better light conditions and simi- lar ... Berücksichtigung der Stieleiche (Quercus robur L.). Schriften aus der Forstlichen Fakultät der Universität Göttingen und der Niedersächsischen Forstlichen Ver- suchsanstalt, 140. LARSEN H.S., 1963...

Ngày tải lên: 07/08/2014, 03:22

... umliegende Wirtschaftswälder. In: F A. (ed.):  e Development of Biotic Communities after Windthrow. Landsberg, Ecomed: 292–314. S F. (1955): Pathogenese der Borkenkäfer- Epidemie ... Douglas fi r beetle Dendroctonus pseudotsugae Hopkins in coastal Douglas fi r forests. Canadian Entomologist, 98: 98–111. S H., B T., S H. (1998): Die Be- deutung der...

Ngày tải lên: 07/08/2014, 10:21

... diff erentiated in relation to the spe- cifi c on-site conditions (S et al. 2007). De- spite of a dramatic reduction in the emissions of sulphur oxides in the last decades the impacts of air-pollution ... classifi cation. Evaluation of underplanting damage  e degree of damage to underplantings was evaluated on each research plot, based on the fre- quency of occurrence of visual sympto...

Ngày tải lên: 07/08/2014, 10:21

... relation to plant regeneration ability. Exogenously supplied polyamines could positively influence the induction and somatic embryo devel- opment in less responsive plant genotypes. A stimu- latory ... spermidine was predominant during the stages of embryo development (M, L 2004). e present study was undertaken to establish changes in the levels of PAs during development of som...

Ngày tải lên: 07/08/2014, 10:21

... 2004 2005 (cm) Years Fig. 1. Growth of older plantings of rooted cuttings of beech on Trutnov 2 PRP (use of large-sized plants – planting in 1993). Bars designate the intervals of reliability ... on the available knowledge of the growth of rooted cuttings of beech planted onto permanent forest sites it can be concluded that no greater prob- lems were identified that would impede their ......

Ngày tải lên: 07/08/2014, 10:21

... root-diameter class, but it was only 0.18 in the last root-diameter class. We found out an unproportionally higher relative value of the average number of root branches in the first root diameter class ... values of the relative average number of root branches were close to zero in the last root-diameter classes. After having excluded the roots belonging to the first diam- eter class, th...

Ngày tải lên: 07/08/2014, 10:22

... be a reason for the high mortality and nec- romass accumulation during this month. Similarly, necromass accumulation due to dry episodes during the growing season has been reported in a variety ... among the soil layers between 0.40 and 1.38 per year. Similarly, this turnover decreased linearly with soil depth (r = –0.88, P = 0.03). In both species, the largest differences considering the...

Ngày tải lên: 07/08/2014, 10:22