Báo cáo lâm nghiệp: " Effects of tree species on understory vegetation and environmental conditions in temperate forests " pps
Báo cáo lâm nghiệp: " Effects of tree species on understory vegetation and environmental conditions in temperate forests." pps
... of this study was to compare the impact of six tree species on vegetation and soil. Eighty stands growing side by side, and of different dominant species, were selected in 26 locations. Within ... studies haveexamined the impact of tree species on the composition of * Corresponding author: laugusto@bordeaux.inra.fr Effects of tree species on vegetation and soil 825Therefore, relative ... characteristics explained most of the variability in soil and vegetation results. Differences among sites weremuch higher than among tree species. 4.2. Effect of tree species on soilThe tree species effect...
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Báo cáo lâm nghiệp: "Effects of light intensity on the growth and energy balance of photosystem II electron transport in Quercus alba " potx
... resulted in the gradient of light environments that are characteristic of understory conditions in gap, moderate, and dense vegetation cover in mature oak forests. 2.2. Data collectionLight ... haverevealed a lack of understanding of ecological and physiolog-ical processes involved in oak regeneration.Light is a critical factor affecting early survival and growth of tree seedlings under a ... lower in HS as opposedto seedlings grown under FL conditions. Figure 4 depicts the relationship between ETR and the driv-ing force of electron transport to the reduction of the redox stateof...
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Báo cáo lâm nghiệp: "Effects of soil temperature on gas exchange and morphological structure of shoot and root in 1 yr old Scots pine (Pinus sylvestris L.) seedlings" pot
... LippuP. PuttonenDepartment of Silviculture, University of Helsinki, Unioninkatu 40 B, 00170 Helsinki, FinlandIntroductionLow soil temperature is one of the envi-ronmental factors ... errors in A, E and g. Effects of soil temperature on gas exchange and mor-phological structure of shoot and root in 1 yr old Scotspine (Pinus sylvestris L.) seedlingsJ. ... Strain B.R. (1985)Reversibility of photosynthetic inhibition in cot-Soil temperature affected gas exchange in pine seedlings. In general A and E werehigher in warm than in...
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Báo cáo lâm nghiệp: " Effects of water deficit on leaf in fast-growing tree species growth and initiation" docx
... Effects of water deficit on leaf growth and initiation in fast-growing tree species J.C. MetcalfeW.J. Davies1J.S. Pereira21 Institute of Environmental and Biological ... initiation is important and, as demon-strated in Fig. 3, the initiation of newleaves at the apex of the dominant shootis restricted with developing water stress.Indeed, ... patterns of juve-nile E. globulus have been investigatedunder conditions of water deficit, in conjunction with detailed measurements of gas exchange.Materials and MethodsExperiments...
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Báo cáo lâm nghiệp: " Dynamics of tree species composition and characteristics of available space utilization in the natural forest of the National Nature Reserve Hrončokovský Grúň" pot
... yield indicators of indi-vidual tree species confirmed that under favourable soil conditions, maple and ash as moderately shade-tolerant admixed species are able to maintain their position in ... dominate in the lower and intermedi-ate layers, has a correlation index of R = 0.64, which is understandable concerning the behaviour of the virgin forest at this stage.Trends of tree species ... the increase in the tree growth space and the stem volume increment.Growth and competition relationships between the tree species with different ecological demands on light and nutrients in...
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Báo cáo lâm nghiệp: "Effects of artificial damage on the branching pattern of Nothofagus dombeyi (Nothofagaceae)" ppsx
... damage of N. dombeyi branching systems In N. dombeyi trees, like in many other tree species, thebranching system consisting of a parent shoot extended in oneyear and a cohort of offspring shoots ... branches at thebeginning of their extension would exert only a minor effect on the size gradients of branches on a common parent shoot, in contrast with the results of studies on other species [9, ... Results of two-way ANOVAs (Fisher’s test, F) assessing the effects of treatments and trees on the position of the most proximal offs-pring shoot, the diameter, length and number of nodes of the...
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Báo cáo lâm nghiệp: "Effects of silviculture treatments on vegetation after fire in Pinus halepensis Mill. woodlands (SE Spain)" ppt
... old). In great fires recorded in SE Spain, a decrease in the effects of interspecific competi-tion by partial elimination of Cistus monspeliensis L. individ-uals increased survival and growth of ... potential [42] and competition effects on germination of therophytes describedby Pausas et al. [32].As a conclusion to this study, in spite of the intense modifi-cation of vegetation structure ... the present study and consequences on P. halepensisgrowth and cone production [15], thinning to a final density of 1 600 trees/ha must be recommended. Pine forests of SE Spainare low productive...
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Báo cáo lâm nghiệp: "Effects of phosphate deficiency on photosynthesis and accumulation of starch and soluble sugars in 1-year-old seedlings of maritime pine (Pinus pinaster Ait)" doc
... the effects of phosphorus deficiency on carbon assimila-tion in forest tree species (Ericsson and In- gestad, 1988). In Australia, P fertilization of Pinus radiata increased ... discussed.MATERIALS AND METHODSPlant material and growth conditions Seeds of maritime pine (P pinaster) (INRA-CE-MAGREF) were germinated on natural peat for1 month. After germination, 60 ... reduction in triose-P utilization and maximal carboxylation effi-ciency in nonmycorrhizal seedlings grownwith limiting phosphorus, the leaf P concen-tration of which being...
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Báo cáo lâm nghiệp: "Effects of seedling density on the growth of Corsican pine (Pinus nigra var. maritima Melv.), Scots pine (Pinus sylvestris L.) and Douglas-fir (Pseudotsuga menziesii Franco) in containers" ppt
... reports on thedirect effects of seedling density on growth in the absence of confounding effects of cell volume. Comparisons of seedlinggrowth in different sized containers ... Specification of seedling size in terms of shoot height alone is not a goodmeasure of seedling size since heightgrowth of container seedlings grown atclose spacing is a response ... affecting seedling size. The weight of Douglas-fir seedlings grown at 400 m-2did not increase when container volumewas increased; increasing the volume of the containers...
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Báo cáo lâm nghiệp: " Effects of saline stress on Eucalyptus seedlings" docx
... of the stress application. Effects of saline stress on germinationThe application of saline stress led to areduced germination rate. E. alba was themost sensitive species; ... of freeamino acids, but its content in leaves wasquite variable depending upon the proven-ance.ConclusionSaline stress reduced growth of plants and induced changes in ... to a release of the sodium accumulated in the roots.Increased sugar, protein, amino acid and proline contents were induced bysaline stress application. Proline mightrepresent...
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