Báo cáo lâm nghiệp: "Predicting site productivity and pest hazard in lodgepole pine using biogeoclimatic system and geographic variables in British Columbia" potx
Báo cáo lâm nghiệp: "Predicting site productivity and pest hazard in lodgepole pine using biogeoclimatic system and geographic variables in British Columbia" potx
... articlePredicting site productivity and pest hazard in lodgepole pine using biogeoclimatic system and geographic variables in British ColumbiaHarry X. WUa*, Cheng C. YINGb, Hong-Bo JUca ... has been expanded to interior spruce (Picea engel-mannii Parry and P. glauca (Moench) Voss) and lodgepole pine (Pinus contorta Dougl.) in site productivity [20, 34, 35] and pest hazards [19].The ... ecologically site spe-cific. Various approaches have been attempted to establish cor-relations of site climatic, edaphic and biotic factors with site productivity and pest hazards in lodgepole pine and...
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Báo cáo lâm nghiệp: "Predicting balsam fir growth reduction caused by spruce budworm using large-scale historical records of defoliation" potx
... Radial and volume increment lossesRadial and volume increment losses were assessed on the basis ofstandardized ring width and periodic annual increment in volume,respectively, in order to eliminate ... (1965–1995) that covers the last insect outbreak. Defoliation variables explained 36% and 23% of the annual changes in ring width index and annual volume increment index, respectively. Defoliation ... sum-marized in Table I.2.2. Sampling procedureThe selected PSPs were located and inventoried again during thesnow-free periods between 1998 and 2002. The inventory consisted in measuring the diameter...
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Báo cáo lâm nghiệp: "Predicting stand damage and tree survival in burned forests in Catalonia (North-East Spain)" pot
... suber) and stone pine (P. pinea) being exceptionally fire tolerant. The high sur-vival rate of cork oaks can be explained by its thick bark and re-sprouting capability [28]. In the case of stone pine, ... one hand, the size and position of the tree in the diame-ter distribution (dand BAL), and the structure of the stand (Dg,sd/(Dg+ 0.01) and G), on the other hand. Variables PPinea and QSuber ... thinning and prescribed burning oncrown fire severity in ponderosa pine forests, Int. J. Wildl. Fire 11(2002) 1–10.[32] Rigolot E., Predicting postfire mortality of Pinus halepensis Mill.and...
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Báo cáo lâm nghiệp: "Across-site heterogeneity of genetic and environmental variances in the genetic evaluation of Eucalyptus globulus trials for height growth" ppt
... clones within full-sib fami-lies, and e is a vector of random residual terms. X, Z1, Z2 and Z3 areknown incidence matrices relating the observations in y to effects in b, a, f and c, respectively. ... of parents and clones within full-sib families were obtained from the heterogeneous variances model, and from a simplermodel assuming variance homogeneity across trial sites and using either ... in and fol-lowing the data adjustments were observed in trials 1 (i.e. +0.10 and +0.32) and 5 (i.e. –0.33), respectively.Table V indicates that the analysis assuming homogeneousvariances and...
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Báo cáo lâm nghiệp: "Predicting the environmental thresholds for cambial and secondary vascular tissue development in stems of hybrid aspen" pptx
... [14] and, perhaps, theexpanding internodes of young stems. Thus, a certain numberof young leaves and internodes may need to have been devel-oped in order for the auxin-dependent pre-condition ... horizontal lines in thegraph represent the threshold values for the accumulation of the indicated secondary vascular cell types. For periclinal divisions in the cambium, and for the increase in the ... of xylem fibres and vessels, accumulation is initiated to the right and above the respective vertical and horizontallines (indicated by arrows). For xylem and phloem ray cells, and for phloem,...
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Báo cáo lâm nghiệp:"Predicting the probability of seed germination in Pinus sylvestris L. and four competitor shrub species after fire" doc
... different thermal chocks and control situation. Control 50ºC 75ºC 100ºC 125ºC1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min 10 min 15 min 1 min 5 min10 min 15 minHalimium alyssoides ... 2Control 70 ºC 90 ºC 110 ºC 130 ºC 150 ºC 170 ºC 190 ºC1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 min 1 min 5 minPinus sylvestris 94 94 95 93 90 92 8 78 0 27 0 0 0 0 0 ... germination rate in shrub species at high temperature than for Scots pine. Thus by limitingcompetition between Scots pine and understory species, using prescribed burning or mechanical site...
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Báo cáo lâm nghiệp:"Predicting of oak wood properties using X-ray inspection: representation, homogenisation and localisation. Part II: Computation of macroscopic properties and microscopic stress fields" pdf
... vanishes.Finally, the order 0 is required to close the problem. Keep-ing in mind that is anti-periodic and integrating theresulting equation over the unit cell, we finally obtain:.(10)This ... Geometry and Transports –Butterworth-Heinemann Series in Chemical Engineering, 1992.[2] Astley R.J., Harrington J.J., Stol K.A., Mechanical Modelling ofWood Microstructure, an Engineering approach, ... Keeping in mind that the averaged shrinkage has to be weighted by thematerial stiffness, the dimensionless macroscopic shrinkage iscalculated according to the following expressions:Radial shrinkage...
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Báo cáo lâm nghiệp: "Multifunctional forestry practices as a land use strategy to meet increasing private and public demands in modern societies" ppt
... (6): 290–298 and managing responsibly. Openness and flexibility in reacting to changing societal needs and values, understanding of the ecological, social and economic drivers determining their ... coni-fers were systematically favoured because the thin-ning and final felling of even-aged stands allowed a rapid increase in wood production to meet economic demands. In the Alps and, to a lesser ... generating profit and income. ey also determined responsibility for maintaining collective uses in the public interest, such as access to forests and protec-tive values in the mountains, which were...
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Báo cáo lâm nghiệp: "Improving RBS estimates – effects of the auxiliary variable, stratification of the crown, and deletion of segments on the precision of estimate" pps
... cutting points was indifferent for the young pines, at 60% and 80% of the stem height for the old pines, at 20% and 60% or at 40% and 60% for the spruces and at 20% and 40% for the mountain ashes. ... point at the stem.For trees divided into two strata and without de-leting the stem segments, more precise estimates are observed for European mountain ashes and old pines. For the young pines, ... stem for all species. Optimal cutting points for the ashes are at the lower end of the stem, for spruces and old pines at the higher end, and for young pines in the middle of stem.For three...
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