Báo cáo lâm nghiệp: "Extended length rotation to integrate timber and pine nut production with the conservation of structural diversity in a Pinus pinea (L ) forest" pdf
Báo cáo lâm nghiệp: "Extended length rotation to integrate timber and pine nut production with the conservation of structural diversity in a Pinus pinea (L.) forest" pdf
... rotation to integrate timber and pine nut production with the conservation of structural diversity in a Pinus pinea (L. ) forestFernando M a *,MaríaJ.H´b, Rafael C a ,IsabelC˜ a aCIFOR-INIA, ... distance from each other is within the distance lag cen-tred at d ,andz(u a )andz(u a +d) are the values that the variablez takes at samplesu a and u a + d. The experimental variogram and fitted ... used to calculate the most likely of the four rot risk classes as a function, for each fixed basalarea, of the age and the dominant height of the stand, obtainingfor each value of basal area a...
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Báo cáo lâm nghiệp: "Multivariate statistical approach to comparison of the nutrient status of Norway spruce (Picea abies [L.] Karst.) and top-soil properties in differently managed forest stands" potx
... analysis (CLU) and principal component analysis (PCA) (J 199 8). Alternatively to CLU multi-variate analysis of variance (MANOVA) was applied. CLU and MANOVA were used to evaluate the ... silvicultural activities and left to natural develop-Table 1. Some basic mensurational data of the RPs (according to P 200 6) Spruce standMean stemStanding volume (m3/ha)Stand basal area (m2/ha)d1.3 ... and topically individual interactions with soil and these interactions in uence its state, ( 2) the in uence of forest management reflects in humification and in the nutrient status in plant assimilatory...
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Báo cáo lâm nghiệp: "Rodent-caused damage to forest trees from the viewpoint of forestry practice" potx
... 265–270extent of damage to plantations becomes apparent, being unable to defend against this harmful factor. One of the reasons for this passive approach to deal-ing with damage caused by small mammals ... cause significant damage all over the Czech Republic and that the occurrence of damage cannot be easily predicted with certainty as significant damage may appear perhaps in a small part of the ... age of the most damaged trees, prevalent type of damage and characteristics of vegetation of severely damaged plots.( 3) Control of damage caused by small mammals. Information gathered in...
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Báo cáo lâm nghiệp: "Biomass functions applicable to oak trees grown in Central-European forestry" doc
... Table 2. Stand characteristics of a generated test stand exemplifying the typical management of oak; mean stand height, basal area and stocking density (N) are shown for each stand ageStand ... compared with table values of F-distribution taking into account the amount of parameters and standard deviations of residuals of the tested sites.Reference standFor a quantitative analysis of ... bark, bark, living branches and dead branches was also explored on the above fictitious oak stand managed in a classical way at 25, 50 and 100 years of age (Table 2, Fig. 3). e estimated aboveground...
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Báo cáo lâm nghiệp: "Reconstructing crown shape from stem diameter and tree position to supply light models. I. Algorithms and comparison of light simulations" doc
... each study area. The first buffer area brings the surface area of Plots 1 and 2 to 2.22 and 0.67 ha, respectively, and the second buffer area brings the surfacearea of Plots 1 and 2 to 3.58 and ... important asymmetry amongtrees, due to the old coppice -with- standards structure of the stand and the presence of gaps. Further validations in otherstand types should be made to compare and validate ... few thinning operations have been carried out since the 1960’s.Standards are mainly beech (Fagus sylvatica L .), sycamore (Acerpseudoplatanus L .), Norway maple (Acer platanoides L .) and oak(Quercus...
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Báo cáo lâm nghiệp:"Poplar plywood resistance to wood decay agents: efficacy of some protective treatments in the light of the standard ENV 12038" ppt
... R. Zanuttini et al.were subjected to tension shear applied in a middle area of 25 ´25 mm with a testing machine having a maximum capacity of 50 kN and accuracy of ± 1%. The shear test was done ... in any case useful to refer to the Europeanstandardization context related to the biological durability of wood and wood-based panels. The EN standards consider that, in case of a possible attack ... Within this context, EN 350-1acts as a guideline for the determination and classification of the natural durability of solid wood against the attack of wooddestroying organisms. Part 2 of the...
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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
... nigra (solid line) as a function of predictedpast radial growth, dbh, basal area, and total basal area of larger trees (thin lines indicate the standard error of the mean).Figure 2. Measured and ... (m2·ha–1 ), BALthin is the total basal area of trees larger than the subject tree and thinned during the next 10-year period (m2·ha–1 ), G is stand basal area(m2·ha–1 ), and GI is the stand ... tree and stand development. The predicted 10-year change in tree and stand basal area of the living pines (i.e., pines that were notthinned and did not die) in the inventory plots was compared to...
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Báo cáo lâm nghiệp: "Ecophysiological factors contributing to the distributions of several Quercus species in the intermountain west" docx
... the absence of summer moisture inputs, Qmacrocarpa and Q turbinella were unable to maintain active gas exchange through the day; followingan early morning peak, leaf conductances ... for the apparent midday reduction of water stress in Q macrocarpa. Higher rates of gasexchange occurred in Q gambelii and Qgambelii x macrocarpa than in Q macro-carpa, ... 0.0 1). Together these gas exchange data indi-cated that both species native to habitats with summer precipitation were not able to maintain gas exchange through the day in the...
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Báo cáo lâm nghiệp: "Soil compaction caused by 450C Timber Jack wheeled skidder (Shefarood forest, northern Iran)" doc
... soil compaction, decreases soil porosity, in ltration rate and aeration and these in turn increase runoff and water erosion in the harvested area. On the other hand, a decrease in soil aeration ... necessary to harvest these forests in a methodical plan with the knowledge of different elements of harvesting, so that harvesting and efficiency are increased, but at the same time maintaining the ... the natural balance of forest by not en-dangering the soil, plant and animal life.On this basis, with the disappearance of traditional harvesting and the need for suitable forest mechani-zation...
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