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Báo cáo lâm nghiệp: "Ecophysiological factors contributing to the distributions of several Quercus species in the intermountain west" docx

Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Ecophysiological factors contributing to the distributions of several Quercus species in the intermountain west" docx

... noteEcophysiological factors contributing to the distributions of several Quercus species in the intermountain westJR Ehleringer,SL PhillipsDepartment of Biology, University of Utah, ... examineaspects of the water relations of these threeoak species native to the intermountain westand of their hybrids under common growthenvironments in order to evaluate ... precipitation inputs since the late spring. In contrast, the native species, Qgambelii, and the Q gambelii hybrids werealbe to maintain higher rates of gasexchange during this...
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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

... the height of the tree at the end (H2) and at the be-ginning (H1) of the five year period, as well as the differencebetween the age at the end of the period (T2) and the age at the beginning ... for the estimated age. The distribution of the age of the dominant strata and the site index within the for-est area can be seen in Figure 4. The classification of the forestarea in function of ... years. If the aim is the conservation of some protected or rare species, the criteria to determine rimust be to maintain the extent of habitat to sup-port certain population.By choosing the areas...
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Báo cáo lâm nghiệp: "Growth, allocation and leaf gas exchanges of hybrid poplar plants in their establishment phase on previously forested sites: effect of different vegetation" docx

... application of the treatments,no difference in inter-row weed biomass was found between the mowed plots (M) and the control (V) (Tab. I). The applica-tion of herbicides in the beginning of the growing ... treatments practiced in this study differed in their success in terms of controlling the weeds. Two months after the application of the treat-ments, the presence of competing vegetation in the mechanicalmowed ... advantage of the absence of competingroots in the soil space to develop their root system [2, 14] in order to equilibrate quickly the balance between the aerial and the belowground part of the trees...
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Báo cáo lâm nghiệp: "Modelling canopy conductance and stand transpiration of an oak forest from sap flow measurements " docx

... as during the leaf fall period.Coupling of transpiration to the atmosphereWe first tested the sensitivity of the model to ga in the case of the oak stand using higherfor ... and model wereobserved in the morning and in the evening,probably due to a dehydration in the morning of the water exchangeable tissues of the trees (Jarvis, 1975), followed ... simulated in figure 4 the response to increasing incident global radiation. Atheoretical oak canopy of LAI = 6 was par-titioned into six layers of LAI = 1 each. The same...
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Báo cáo lâm nghiệp: "Gibberellin A enhances flowering 4/7 of Picea glauca grafts in two consecutive years" pdf

... I).Interactions were due to a change in magnitude of response, rather than to achange in rank of the treatment combina-tions. Clone x treatment interactions forstaminate ... year’sgrowth as an index of when to applyGA4n. The final length of the treatedbranches in 1984 was 75% of the controllength and 70&dquo;/° of the previous year’s ... potentiallybe used to determine when to applyGA4n.Branch length reduction by a heavyflowering/cone crop could affect the use of a certain percentage of the previous year’sgrowth...
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Báo cáo lâm nghiệp: "Ecophysiological responses of Mediterranean pines to simulated sea aerosol polluted with an anionic surfactant: prospects for biomonitoring" pptx

... of the sprayed concentration,regardless of the species. This suggests that the three pines have the same ability to intercept sea aerosols. In the past, concentrations of MBAS measured in the ... Mediterranean pinewoodsfrom the hazards presented by these pollutants.As time passed after the sprayings, an increase of visibleinjury was observed in all species, due to the increase of chlo-ride ... report indi-cations on the status of stomata. The degeneration of the pro-toplasm of mesophyll cells, observed in P. pinea sprayed with1000 mg/L of surfactant [12], may be a further cause of loss...
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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

... among the indicators of soil disturbances. e soil dysfunctions that are among the factors of forest decline (M 2003) cause that symptoms of decline appear both in natural and in managed ... Differences in the properties of the particular sampling points and the fact that the in uence of soil heterogeneity on the specificity of forest stand cannot be fully neglected complicate the interpretation ... used to evaluate the close-ness of the nutrient status of the spruce stands and to assess the closeness of chemical properties of the studied sites. e results were tested by PCA. To test the...
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Báo cáo lâm nghiệp: "Rodent-caused damage to forest trees from the viewpoint of forestry practice" potx

... e intensity of damage to individual tree species corresponds to the need of repair planting in plantations that were totally destroyed by rodents. In the case of beech it was necessary to ... However, this opinion concerning the significance of the individual species is in contradic-tion with the information the foresters provided on the distribution of damage which is the greatest ... dynamics of rodents in forest environment, their feeding behaviour and the damage they cause. At the beginning of the research, we conducted a survey among foresters in the form of a questionnaire...
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Báo cáo lâm nghiệp: "Which factors explain lepidopteran larvae variance in seasonal guilds on some oaks" pptx

... factor. The number of species and also individuals in the SF guild was quite low. is guild tended to be in uenced more by the poor quality of leaves and the increasing accumulation of tannin ... Because of a lack of information about the quality of food and amount of tannin in leaves during our study we cannot precisely estimate the impact of these factors. ere are however some indications ... and larger species skeletonize leaves only in the first larval stages, later feeding externally. Another kind of adaptation is feeding on understorey plants or on the bottom part of the canopy....
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Báo cáo lâm nghiệp: "Biomass functions applicable to oak trees grown in Central-European forestry" doc

... e information on tree biomass is required to assess the amount of carbon held in trees, which in turn represents the basis of the assessment of carbon stock held in forests. is leads to the ... three parameters of the equation. However, it is to note that in allometric studies the nonlinear regression analysis is often avoided using the logarithmic linearization of the power functions, ... equation including only a single independent variable D. H usually helped to explain the variation of logarithmically transformed variable by additional 0.5 to 1% (Table 3). In terms of the mean...
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