Báo cáo lâm nghiệp: " The management of snags: A comparison in managed and unmanaged ancient forests of the Southern French Alps" pot

... could then be considered as a potential and optional candidate for maintaining the habitat diversity of SDT and CWD. An integrated forest management could then Snags in ancient forests of French Alps ... 135–142 © INRA, EDP Sciences, 2005 DOI: 10.1051/forest:2005005 Original article The management of snags: A comparison in managed and unmanaged ancie...

Ngày tải lên: 08/08/2014, 00:21

... new coatings often contain UV-absorbers and radical scavengers [21]. Their aim is on the one hand to transfer UV-irradiation into heat instead of photochemical processes of lignin degradation ... pattern of the samples after A1 treat- ment revealed a wood failure portion of 80% in the fracture sur- face of the red-hearted samples and a wood failure portion of 90...

Ngày tải lên: 08/08/2014, 00:22

... sites at the upper forest limit are valuable in assessing the climate changes and are useful for the forest management practice in mountain areas. Keywords: anatomy; assimilation capacity; climate ... needle characteristic separately. Needle length was analyzed using the Kruskal-Wallis test as the nonparametric analysis of variance be- cause of the violation of...

Ngày tải lên: 07/08/2014, 10:21

... during the day and decreased dark respiration so that the diurnal C0 2 balance was 28% greater for the C0 2- enriched plants (results not shown). The 28% increase in daily ... very unusual and may have resulted from the timing of the nutrient application. The accumulation of the carbon surplus was restricted to the root system. Thes...

Ngày tải lên: 09/08/2014, 04:20

... represents, above all, a favoured area for leisure and relaxation. Inhabitants of mountain re- gions see it as protection against natural dangers and as a tourist attraction. Forest owners, farmers, and ... over increasingly large areas. In regions where oak and beech forests dominated, the coppice-with-standards system was a typical example of systematic manageme...

Ngày tải lên: 07/08/2014, 03:22

... polyphagous species (Pandemis cerasana, Chloroclysta miata, Se- lenia tetralunaria, and Eulia ministrana) are present on the lower part of axis 2, and specialized species (Elegia similella, Moma ... increasing accumulation of tannin as reported by F (1970) and also F et al. (2004). Because of a lack of information about the quality of food and amount of...

Ngày tải lên: 07/08/2014, 10:21

... Phytophthora quercina was present in five of the stands, while the other five stands were used as controls to verify the effect of the pathogen. In each stand, a healthy, a moderately declining and a severely ... resembled the infested stands were chosen. Some of the stand characteristics used to pair the investigated stands are presented in Table I. The mean...

Ngày tải lên: 07/08/2014, 16:20

... apparent in all the models analyzed in terms of the residuals of the taper and merchantable volume equations as a function of lag1- and lag2-residuals within the same tree. We therefore expanded the error ... observations, substitution of the estimated parameters in the system, and fitting of the remaining parameters; (ii) estimation of the parameter...

Ngày tải lên: 07/08/2014, 16:21

... family). 3.3.2. Axial parenchyma The axial parenchyma was found to be mainly paratracheal in the good acoustic woods, ranging from scanty paratracheal (Calophyllum, Commiphora and Swietenia) or lozenge-aliform – ... classified by an xylophone maker and on the basis of an analysis of radiated sound signals and these separate classifications were compared with the aim of d...

Ngày tải lên: 08/08/2014, 00:22

... d’eau des feuilles par la transpiration [50]. Cette relation se manifeste par la corrélation entre la surface de l’aubier (sapwood area, SA) et la surface foliaire (leaf area, LA), pour un arbre ... University of Geneva, Geneva, 1993. [14] Fischer M., Matthies D., RAPD variation in relation to popula- tion size and plant performance in the rare Gentianella germanica (Gentianaceae),...

Ngày tải lên: 08/08/2014, 00:22