Báo cáo lâm nghiệp: " Web-spinning sawflies of the genus Cephalcia Panzer (Hymenoptera, Pamphiliidae) in the Picea abies forests of the Beskidy Mountains (Poland)" pptx

... 63 JOURNAL OF FOREST SCIENCE, 53, 2007 (Special Issue): 63–68 Web-spinning sawflies of the genus Cephalcia Panzer (Hymenoptera, Pamphiliidae) in the Picea abies forests of the Beskidy Mountains (Poland) M. ... importance. Keywords: web-spinning sawfly; Picea abies; Cephalcia; Beskidy Mountains; Poland e increased level of the occurrence of w...

Ngày tải lên: 07/08/2014, 03:22

... Mountains, the climate is under the double influence of humid winds from the Atlantic (westerly) and of continental anticyclones (originating in the east). In the highest part of the range, mean annual ... displacement of the ecotone towards the centre of the bog, with development of spruces on the expanse of pines. Furthermore, we supposed that this eco...

Ngày tải lên: 08/08/2014, 01:21

... radiata pine plantations 613 identical for all the measurements belonging to the same unthinned growth period within a single plot, hereafter the individual being in- vestigated. During the fitting ... for Pinus pinaster stands in Galicia. In summary, taking into account the adequate graphs pro- vided by model BA2 (Fig. 1) as well as the values of the goodness -of- fit sta...

Ngày tải lên: 07/08/2014, 16:21

... consisted of determining the number of years of suppressed growth and then applying the linear height growth of the subsequent years to the suppression period. Suppressed growth was defined as the very ... variables to the model. Then, to determine the variables that played a significant role in explaining the variation of ring width index and annual volume increme...

Ngày tải lên: 08/08/2014, 00:21

... seedlings initiated terminal buds after 2 weeks of treatment and 100% initiated terminal buds within 3 weeks. In contrast, 60–70% of the seedlings in the other treatments initiated terminal buds ... photoperiod reduction in the SD treatment was additive to the dormancy-inducing stimulus of the naturally shortening daylengths. Short day treatment resulted in the initi...

Ngày tải lên: 08/08/2014, 01:21

... basal area (G) of the living pines in the inventory plots using the initial ver- sion of the diameter growth models (A), using the new version of the diameter growth models (B). In each case, the fixed ... (thin lines indicate the standard error of the mean). Figure 2. Measured and predicted 10-year changes in the tree basal area (g) of living P. sylvestris...

Ngày tải lên: 08/08/2014, 01:21

... between the thickest branch and thinnest one increases as and when the tree grows. • With tree ageing, living whorls also contained dead thin branches contributing to the inflation of the within-whorl ... studying the branch radial increment rather than the cumulated diameter. 4.2. Does there exist a maximum value of branch diameter? In Vosges old mountains trees, the...

Ngày tải lên: 08/08/2014, 01:22

... bicarinatus oviposit into the larvae of C. lariciphila when borrowing in soil in the late May. The infestation of Cephalcia prepupae is not high and varied within the range of 3.5–6.1% during ... 2004–2005). Measuring of the size of adults (length of body – form head to end of metasoma, length of the fore wing) was carried out using a stereomicroscope wit...

Ngày tải lên: 07/08/2014, 10:21

... photosynthesis under severe drought stress. Acknowledgements: We thank the staff of the Instituto de Botánica of the Universidad Austral de Chile for their logistic support and maintenance of the ... efficiency of PSII in the light (∆F/Fm  ) and photochemical quenching (qP) were always lower in N. nitida and along with the photochemical efficiency in the dark (Fv/Fm) t...

Ngày tải lên: 07/08/2014, 16:21

... structure, the whole-stand model requires five stand-level inputs for simulation: the age of the stand at the beginning and the end of the projection interval, and the initial dominant height, number of ... initial age provided sufficient information about the future trajectory of the basal area of the stand, regardless its thinning history. Therefore, the thinnin...

Ngày tải lên: 07/08/2014, 16:21