Báo cáo lâm nghiêp: "Contribution à la taxonomie et à l’écologie des chênes du Berry" ppt

... de sorte que la hauteur à un âge donné peut être estimée à partir de la hauteur à un autre âge, sans compromettre la validité des prédictions. croissance en hauteur / classement des sites / équation ... pour prédire la croissance en hauteur et pour réaliser les classifications de qualité des sites de plantation des pins sylvestres en Galice. Cette équation est invarian...

Ngày tải lên: 08/08/2014, 00:21

... temps après la coupe rase. La reconstitution relativement rapide des espèces naturelles du sous-bois peut être due à la faible perturbation de la surface du sol forestier au moment de la coupe rase. ... D  a,c a Universidad de La Laguna, Departamento de Ecología, La Laguna, Tenerife, 38206, Spain b Universidad de La Laguna, Departamento de Botánica, La Laguna,...

Ngày tải lên: 07/08/2014, 16:20

... parasitoids on the total population of the bark beetle was calculated on base of the following mathematic relations. Presumptions of utilize mathematic relations is that one individual of parasitoid ... L et al. 1994 studied the role of the para- sitism and intraspecific competition in the popula- tion dynamics of the bark beetle. C and L-  1994) on H. fraxini researche...

Ngày tải lên: 07/08/2014, 03:22

... cherry is similar to other fast growing broadleaves such as Acer pseudopla- tanus, Acer platanoides, Fraxinus excelsior (L-  1988; R et al. 1999; P 2007). However, despite of its ... 267 and confirms that there is no “transition” between the future crop tree and suppressed tree layer. A similar situation can be observed in diameter analysis. e trees that do not belong to ....

Ngày tải lên: 07/08/2014, 03:22

... Ministry of Education, Youth and Sports of the Czech Republic, Project No. MSM 6215648902. Contribution to the knowledge of Clethrionomys glareolus populations in forests of managed landscape in ... HL (26.8%). But no large differences were found between the locali- ties. e highest number of females with embryos and placental scars was found in RB, probably due to better overwintering ......

Ngày tải lên: 07/08/2014, 03:22

... excelsior), pedunculate oak (Quercus robur), black poplar (Populus nigra), large- leaved lime (Tilia platyphyllos) and common maple (Acer campestre). e Hájek locality (HA) (60 ha) is a typical produc- tion ... includes a number of miscellaneous woody species of various age categories as well as small open areas, such as meadows, small fields, and wetlands. Pedunculate oak (Quercus robur...

Ngày tải lên: 07/08/2014, 03:22

... provides an optimization of production system operations from the aspect of the minimum level of produced heterogeneous sub- stances related to the production unit and the mini- mum costs related ... greater detail, not only the kind of the logging and transport system but also particularly the method of reaching its design performance have to be considered. Possibilities of increasing t...

Ngày tải lên: 07/08/2014, 10:21

... dilatata 15 65 ** Athyrium filix-femina 39 61 ** Acer pseudoplatanus s 28 57 ** Alnus glutinosa s 0 41 ** Betula alba s 0 28 ** Betula pendula s 0 14 * Betula pendula A 0 12 * Populus tremula ... International, Oxon, 1998. [40] Lambinon J., De Langhe J.E., Delvosalle L., Duvigneaud J., 1992. Nouvelle flore de la Belgique, du Grand-Duché de Luxembourg, du Nord de la France et des r...

Ngày tải lên: 08/08/2014, 00:21

... Bong. Betula pubescens Ehrh. Ranger et al., 1981 [42] Species High C130 Betula pendula Roth. Castanea sativa Mill. Huet et al., 2004 [20] Species Quercus robur L. Fagus sylvatica L. Huet et al., ... existantes du sol et de la végétation. Les stocks de carbone dans le sol, les humus et la végétation ont été mesurés sur 100 points distribués dans les classes représentatives de l...

Ngày tải lên: 08/08/2014, 00:22

Ngày tải lên: 08/08/2014, 00:22