Báo cáo lâm nghiêp: "Le taux de conversion de volumes de bois frais en biomasse : amélioration de ses méthodes d’estimation" ppt
Báo cáo lâm nghiêp: "Le taux de conversion de volumes de bois frais en biomasse : amélioration de ses méthodes d’estimation" ppt
... choix de Ph (3 mn) comme poids humide de référence pour le calcul de Vf : si le poids humide que l’on doit prendre en compte pour le calcul de Vf se situe bien entre ... courbes » obtenues ont la même allure. Le poids apparent augmente rapidement au début, puis de plus en plus lentement. Cette augmentation correspond à l’augmen...
Ngày tải lên: 09/08/2014, 06:21
Báo cáo lâm nghiệp: "Le congrès de l’I.U.F.R.O. (Septembre 1981)" doc
... juste- ment en 1982 de ses 394 organisations-membres, regroupant plus de 8000 chercheurs appartenant à 93 nations. Ses activités scientifiques internationales sont réparties en ... français. Outre de nombreuses réunions partielles qui se succèdent à cadences variables, l’Union internationale tient congrès mondial et général environ tous les ci...
Ngày tải lên: 09/08/2014, 06:21
Báo cáo lâm nghiêp: "le robinier dans le Val-de-Loire" pdf
... un certain renouvellement de l’ensouchement au cours des rotations successives, en- souchement qui dans d’autres taillis tend à s’affablir, aussi bien en nombre de souches ... 4). L’évolution de la densité en fonction de l’âge est représentée sur la figure 1. La fonction de distribution des effectifs de brins par classes de circonférenc...
Ngày tải lên: 09/08/2014, 06:22
Báo cáo lâm nghiệp: "The root-plant ratio changes in the first growing periods of wild cherry (Prunus avium L.) plantations" pptx
... výsadeb. Klíčová slova: obnova lesa; kořenový systém; růst a vývoj výsadeb; třešeň ptačí 114 J. FOR. SCI., 53, 2007 (3 ): 113–118 is important for growth performance provided that the nutrient ... decrease of efficiency with an increase in the root system volume. is tendency is not evident from Fig. 4 and from the regression analysis. Our interpretation of the data is that the efficiency...
Ngày tải lên: 07/08/2014, 03:22
Báo cáo lâm nghiệp: "Analysis of some dynamic series of forest production and trends of forest economics in the Czech Republic" ppt
... of the National Energy Concept of the Czech Republic, in connection with the development and tendencies of using the wood raw material for energy purposes. e most prominent world and European ... area of forest regeneration shows a decreasing trend despite the consideration of regeneration methods to be changed to the benefit of the shelterwood system and natural regeneration and the ....
Ngày tải lên: 07/08/2014, 03:22
Báo cáo lâm nghiệp: "Amounts of throughfall and lysimetric water in a sub-mountain beech forest in the Kremnické vrchy Mts" ppt
... Belastung von Waldboden. VDF, Zürich: 161–172. PICHLER V., 1996. Zmeny pôdnej vlhkosti a vlhkostného potenciálu po redukcii zakmenenia bukového porastu. [Dizertačná práca.] Zvolen, TU: 84. SCHIEBER ... Sauer- landers Verlag: 365. PAPRITZ A. et al., 1991. Schnelle Transportvorhange im Wurzelraum. In: Lufthaushalt, Luftverschmutzung und Waldschaden in der Schweiz. Ergebnisse aus dem Nation...
Ngày tải lên: 07/08/2014, 03:22
Báo cáo lâm nghiệp: "The role of Hylastes cunicularius Erichson (Coleoptera: Scolytidae) in transferring uropodine mites in a mountain spruce forest" pptx
... 22 3: 1–320. (in Slovak) M-K A. (1953 ): Eine Übersicht über die gewöhnlichsten mit Borkenkäfern assoziierten Bläuepilze in Schweden und einige für Schweden neue Bläuepilze. Med- delanden ... Med- delanden frĺn Statens Skogsforskningsinstitut, 4 3: 1–74. M J.C. (1976 ): Phoretic carrying capacity of flying southern pine beetles (Coleoptera: Scolytidae). Canadi...
Ngày tải lên: 07/08/2014, 03:22
Báo cáo lâm nghiệp: "Ground based operation effects on soil disturbance by steel tracked skidder in a steep slope of forest" ppt
... (version: 12). Treatment effects were tested using analyses of variance (ANOVA) with slope classes and traffic levels. Independent sample t-test slope compared the differences in mean soil bulk density, ... important difference has been de- tected between SC1 and SC2 in terms of Litter mass removal. ese results provide clear evidence that soil disturbance on steep trail is intensified. Keyw...
Ngày tải lên: 07/08/2014, 03:22
Báo cáo lâm nghiệp: "Energy consumption of a chipper coupled to a universal wheel skidder in the process of chipping wood" pptx
... 95% of dependability intervals for mean values of power for all factors which influences of angles are emphasized P (kW) Assortment Assortment angle: 35 angle: 36 Timber: Beech Timber: Spruce 5 5 8 8 12 ... B. (1996 ): eory and Technology of Wood Processing. Zvolen, Matcentrum: 626. (in Slovak) M M., H J., M J. (2004 ): Forest machines. Zvolen, Technical University in...
Ngày tải lên: 07/08/2014, 10:21
Báo cáo lâm nghiệp: " The influence of Picea abies on herb vegetation in forest plant communities of the Veporské vrchy Mts" ppt
... 1982 : Kulturelle Nadelforstgesellschaf- ten in den Kleinen Karpaten. Biológia, 3 7: 909–918. L K., S W. 1997 : Vegetation und Standortsver- hältnisse in Buchen-Fichten-Mischbeständen des ... 2010 (2 ): 58–67 63 variable. e adequacy of unimodal versus linear response models in ordination was assessed by run- ning Detrended Correspondence Analysis (DCA). e length of...
Ngày tải lên: 07/08/2014, 10:21