Báo cáo lâm nghiệp: " Réflexions sur les surfaces et mesures des états de surface du bois" pptx

... les caractéristiques étaient les suivantcs : - diamètre de pointe du palpeur : 2 mm ; - charge appliquée : 0.5 N. Réflexions sur les surfaces et mesures des états de surface ... maximale de l’écart géométrique considéré (AFNOR, 1972) (fig. 4).

Ngày tải lên: 09/08/2014, 06:21

... d’autres essaient de compa- rer la somme des teneurs en nutriments, telles celles du calcium et du magnésium, soit à des sommes totales, soit partielles des nutriments [14, 22]. Roblès et al. [18] ... chaque type de substrat : 35 sur des milieux calcaires, 31 sur des milieux siliceux acides. En même temps qu’étaient cueillis les rameaux, et sur les mêmes empl...

Ngày tải lên: 09/08/2014, 04:20

... densitométriques spéciales de ce bois ; - il existe une variabilité individuelle significative pour la qualité des états de surface des planches rabotées ; - l’état de surface ... génératrice de l’arbre et que les méthodologies de mesure em- ployées dans cette expérience sont fiables. Il convient aussi de signaler que les critères d...

Ngày tải lên: 09/08/2014, 06:21

... necessary information vary between the countries; they differ in the de nitions of individual parts of this wood, in the lower limit from which it is recorded, and in detection details. While in the ... for animals are detected and lying deadwood and stumps are inventoried, B – two concentric circles (r = 12.62 m and 3 m) for detecting tree characteristics on trees with diameter at breas...

Ngày tải lên: 07/08/2014, 04:20

... 1992 1996 2000 2004 Destructive abiotic Bark beetles Wood destructing fungi 92 J. FOR. SCI., 57, 2011 (3): 89–95 Methods Logistic regression can be used to predict a de- pendent variable on the ... Orava region during the period 2007–2008. No fi eld survey was carried out in the Low Tatras region. A linear discriminant model was designed using the Orava dataset to obtain a dependent vari...

Ngày tải lên: 07/08/2014, 10:21

... evident increase was detected for the period of April–August (Fig. 1A). e values of the air temperature deviations, averaged for the period of March–April, were increased during the decade ... the onset of selected vegetative phenological phases in four deciduous forest tree species in a submountain beech forest stand during the period of 13 years. Potential relationships between ......

Ngày tải lên: 07/08/2014, 10:21

... produced several equa- tions for estimating felling times and productivity. W et al. (2004) developed a productivity model for chainsaw felling, which included variables such as diameter ... mechanical delays are the most frequent. After the mechanical delays, operational delays were the most frequent. In order to prevent a decrease in their efficiency and to reduce delay times ... 0...

Ngày tải lên: 07/08/2014, 10:21

... other. Quercus petraea has smaller leaves arranged close to each other with petioles 15–25 mm in length. Q. robur has the smallest leaves arranged in dense clusters with petioles only 2–5 mm ... particular host tree varies due to random chance is unknown. Despite the fact that oaks are a widely distributed group of trees with over 300–600 species world- wide (T-S et al. 2003...

Ngày tải lên: 07/08/2014, 10:21

... (Larix decidua Mill.). Le développement des embryons zygotiques et son influence sur la formation des graines vides du mélèze d’Europe (Larix decidua Mill.) ont été observés en condition de verger ... pollinisation libre et près de 88 % d’ovules après autopollinisation contrôlée. En moyenne, la dégénérescence des embryons a réduit le pourcentage potentiel de graines pleine...

Ngày tải lên: 08/08/2014, 00:21

... Rollet B., Étude quantitative d’une forêt dense humide sempervi- rente de Guyane vénézuelienne, Thèse de doctorat, Université de Toulouse, Toulouse, 1969. [61] Rollet B., L’architecture des ... recours, pour simplifier le problème, à des techniques de regroupement d’espèces. Il existe des méthodes diverses de regroupement, qui relèvent de trois grands types de stratégie :...

Ngày tải lên: 08/08/2014, 00:22