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

... 63JOURNAL 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 web spinning sawflies associated with spruce in the Polish part of the Beskidy ... DFMMR), there are more than one thousand specimens of the genus Cephalcia, caught since the beginning of the eighties, mainly during periods of mass outbreaks in the Beskidy Mts. In the while,...

Báo cáo lâm nghiệp:"Succession from bog pine (Pinus uncinata var. rotundata) to Norway spruce (Picea abies) stands in relation to anthropic" docx

... Mountains, the climate is under the double influence of humid winds from the Atlantic (westerly) and of continentalanticyclones (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 supposedthat this ecotone was a probable primeval niche of bog pine in intact ... Jura Mountains, there are two ecotypes of Pinus uncinata var. rotundata, one living on top of calcareous cliffs, the other one living in raised bogs [46]. The latter, the bog pine, withstands...

Báo cáo lâm nghiệp: "Modelling stand basal area growth for radiata pine plantations in Northwestern Spain using the GADA" doc

... radiata pine plantations 613identical for all the measurements belonging to the same unthinnedgrowth 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 statistics obtained in the ... times. The first sources of data were the inventoriescarried out in 1995, 1998, and 2004 and on the date of the thinningoperations. In addition, data from the first and second measurements of twothinning...

Báo cáo lâm nghiệp: "Predicting balsam fir growth reduction caused by spruce budworm using large-scale historical records of defoliation" potx

... consisted of determining the number of years of suppressedgrowth and then applying the linear height growth of the subsequentyears 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 volumeincrement index, we successively eliminated ... Since fir-dominated stands are still abundantand are expected to remain so into the future, sustained man-agement of these forests must consider the impact of futureinsect defoliation by integrating...

Báo cáo lâm nghiệp:"Daylength, temperature and fertilization effects on desiccation resistance, cold hardiness and root growth potential of Picea mariana seedlings" docx

... seedlings initiated terminal buds after 2 weeks of treatmentand 100% initiated terminal buds within 3 weeks. In contrast,60–70% of the seedlings in the other treatments initiatedterminal buds ... photoperiod reduction in the SD treatment was additiveto the dormancy-inducing stimulus of the naturally shorteningdaylengths. Short day treatment resulted in the initiation of terminal buds approximately ... about 55% of the time. The remainder of the time, seedlings were exposed to natural photoperiods thatwere themselves sufficiently short to induce budset. Although the intermittent nature of the treatment...

Báo cáo lâm nghiệp: "Using past growth to improve individual-tree diameter growth models for uneven-aged mixtures of Pinus sylvestris L. and Pinus nigra Arn. in Catalonia, north-east Spain" doc

... basalarea (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 basalarea (g) of living P. sylvestris in the inventory plots: using the initialversion ... descriptors (Eqs. (3) and (4)). In the new model versions, site effects were incorporated into the growthindex (GI) included in the fixed part of the models. However, the remaining between-plot variability...

Báo cáo lâm nghiệp: "Relationships between stem size and branch basal diameter variability in Norway spruce (Picea abies (L.) Karsten) from two regions of France" doc

... between the thickest branch andthinnest one increases as and when the tree grows. • With tree ageing, living whorls also contained dead thin branchescontributing 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 absolute lack of adecreasing ... asymptote of the height growth curve):• In young trees, the thickest branches are found in the lowest part of the crown because, all of the tree branches areactively growing. The diameter profile...

Báo cáo lâm nghiệp: "Ecological and morphological notes on Notopygus bicarinatus (Hymenoptera: ichneumonidae)" ppsx

... 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 with an accuracy of 0.1 mm and measuring of the ... 2009).RESULTSWithin May 2003, there emerged in total 89 in- dividuals of the ichneumon wasps N. bicarinatus. e infestation in spring 2003 varied based on in- dividual study areas within the range of 1.5–5.2%....

Báo cáo lâm nghiệp: "Diﬀerential photosynthetic and survival responses to soil drought in two evergreen Nothofagus species" docx

... 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 andmaintenance 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) they declined in both species. ... Beginning three weeks after the suspension of watering, every 8−10 days a different group of 10 drought-stressed individuals of each species was randomly chosenfor sampling. Soil water content of...

Báo cáo lâm nghiệp: "A growth model for Pinus radiata D. Don stands in north-western Spain" doc

... structure, the whole-stand modelrequires 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, regardlessits thinning history. Therefore, the thinning effect is built into the model, in ... important in the development of the dominant heightdynamic model on the basis of data from stem analysis, because of the number of measurements corresponding to the same tree. Never-theless, in the...

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