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Báo cáo lâm nghiệp: "Effects of a clear-cut on the in situ nitrogen mineralisation and the nitrogen cycle in a 67-year-old Douglas-fir (Pseudotsuga menziesii (Mirb ) Franco) plantation" potx

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Báo cáo lâm nghiệp: "Effects of artificial damage on the branching pattern of Nothofagus dombeyi (Nothofagaceae)" ppsx

... that the ratio between the size of the largest branch and the mean size of the otherbranches on a particular shoot of N. dombeyi depends on a number of factors such as the type of axis of the ... here affected the position of the mostproximal branches on shoots. On the other hand, some kinds of traumas acting on a parent shoot at specific periods of the year caused the sum of the sizes of ... Damage at dormancy The interpretation of the results of artificial damage causedduring winter dormancy (experiment 1) is complicated by the number of treatments applied and the degree of variation...
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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

... and thus more biomass was pro-duced by the same amount of leaf area. The rapid rise in LARwith decreasing light intensity (Tab. I) together with the abilityto maintain a positive carbon balance ... cm2 g–1 ) and leaf weight measured for each seedling, totalleaf area (LA; cm2 ) was calculated. Leaf area to total biomass ratio(LAR; cm2 g–1 ) and leaf area to root weight ratio (LARr; cm2 ... separation of irradiance response due to growth irradiance acclimationamong the seedlings. As 1–qP approached 1, the decline in ETRcurtailed off as shade intensity increased. Specifically,...
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Báo cáo lâm nghiệp:" Effects of competing vegetation on juvenile white spruce (Picea glauca (Moench) Voss) growth in Alaska" pdf

... ha) in size. Each plot was randomly assigned one of 6 vegetation manage-ment treatments that included combinations of herbicide release and site preparation (Tab. I), and each vegetation management ... planting and vegetation management in interior Alaska.Wood and von Althen [39] reported results similar to ourstudy on a site near Matheson, Ontario. White and blackspruce (Picea mariana (Mill .) ... covariance matrices. The spatial and unstructured covariance matrices allow unequal inter-vals, and time became the spatial coordinate within the spatial matri-ces. We selected among these matrices...
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Báo cáo lâm nghiệp: " Effects of tree species on understory vegetation and environmental conditions in temperate forests." pps

... (indications of decline) and sil-vicultural management (uneven-aged stand or recent thinnings) wererecorded based on visual inspection. In each stand, mean transmittance of radiation by the canopy ... végétation / plantation / essence1. INTRODUCTION The development of human societies often has caused anoverexploitation of forests and a decrease in their area. In France, the minimum of forest ... spruce and Scots pine, and smaller than Douglas-fir and Norway spruce (Tab. IV). Except for European beech and Douglas-fir, there was no radiation transmittance differenceamong tree species. 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

... O., Casal M., Effect of high temperatures on cone opening and on the release and viability of Pinus pinaster and P. radiataseeds in NW Spain, Ann. For. Sci. 59 (200 2) 327–334.[37] Samo A. J., ... treatmentswhere initial pine density was maintained, therophyte percent-age was the lowest. Once more, the increase in light intensity and decrease in competition promote the installation of ... muricatus L. Other familieswith taxa present in both localities were: Gramineae, Labiatae,Pinaceae, Liliaceae, Cruciferae, Cistaceae, Umbeliferae, Euphor-biaceae, Linaceae, Escrophulariaceae,...
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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

... defined as the rate of photo-synthesis at ca = 150 Pa. The maximal rate of carboxylation (Vc max ) was calculated accordingto Von Caemmerer and Farquhar (198 1) and Harley ... maritimepine seedlings. The main parameters of the biochemical model of CO2 assimilation of Farquhar et al (198 0) were calculated. The contribution of stomatal conductance and leaf ... Γ* is the CO2 compensation point in the absence of light respiration, and Oand Ci are the partial pressures of oxygen and CO2 inside the leaf, and Kc, Ko are...
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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

... and the Northern Research Stationfor raising the container seedlings, and the staffrooting volume held constant, has a stronginfluence on the growth and development of ... the Newton field station for planting and maintaining the field experiment. Ian Wright and Andrew Peace helped with the statisticalanalysis, and John Morgan commented on ... used.Survival, seedling height and root collar diam-eter were assessed at planting and at the end of the first and third growing seasons. Datawere statistically analyzed by ANOVA....
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Báo cáo lâm nghiệp: " Effects of water deficit on leaf in fast-growing tree species growth and initiation" docx

... fromreduced assimilation rates and a decrease in leaf area, and Borralho et aL (198 6) recently reported that non-irrigated E.globulus had a smaller surface area perunit of leaf ... using caliper measurements of leaf length and width and direct values of leafareas obtained with a Li-cor leaf area meter.Gas exchange studies were conducted using a portable ... water,were almost closed in the afternoon.Photosynthesis appeared to declinelinearly with conductance. In the longerterm, a decline in biomass productionunder water shortage will...
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Báo cáo lâm nghiệp: " Effects of saline stress on Eucalyptus seedlings" docx

... out at the end of the stress application.Effects of saline stress on germination The application of saline stress led to a reduced germination rate. E. alba was the most ... Saline stress wasapplied at germination and to seedlings in a greenhouse.Materials and MethodsSeeds wete collected in the natural range of the 3 species; they were available ... leaves.During the saline stress application, the potassium content in leaves and stemsdecreased gradually. After the stressapplication, plants were watered normally: the sodium content...
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Báo cáo lâm nghiệp: "Effects of exogenous ABA on photosynthesis and stomatal conductance of cut twigs from oak" doc

... 1174-1181ResultsEffects of cuttingCutting caused an immediate and steepdecrease in stomatal conductance (g) and net C02 assimilation (A) (Fig. 1 and a rapid increase of water potential (!yw), ... wereimmediate (appearing after less than 1min) and only transient, vanishing in about1 h. A new steady state was reachedthereafter, with significantly lower A and g, and was ... (g) and mesophyllC02 molar fraction (ci) were calculated ac-cording to von Caemmerer and Farquhar(198 1). Results are presented either as timeevolution of A, g and...
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