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Báo cáo lâm nghiệp: "Distribution, historical development and ecophysiological attributes of oak species in the eastern United States " pdf

Báo cáo lâm nghiệp:

Báo cáo lâm nghiệp: "Distribution, historical development and ecophysiological attributes of oak species in the eastern United States " pdf

... even in the absence of fire. ECOPHYSIOLOGICAL ATTRIBUTES OF EASTERN OAK SPECIES The studies reviewed in the previous sec-tions indicate that eastern oak species haveexpanded ... on the gently rolling till plains of Ohio and Indi-ana, and with Tilia americana in south-western Wisconsin, northwestern Illinois,northeastern lowa and southeastern Min-nesota. ... recruitment.CONCLUSION The rise in oak dominance in the eastern United States at the beginning of the Holocene epoch (10 000 years BP) wasassociated with warmer and drier condi-tions and...
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Báo cáo lâm nghiệp: " Root system development and health condition of sycamore maple (Acer pseudoplatanus L.) in the air-polluted region of Krušné hory Mts" ppt

... moundsSycamore maple is one of the noble broadleaved species. Its representation in the existing species composition of forest stands being rather low, the study of the species and mainly of its root system ... growing roots.Nor can we corroborate the statements of the authors according to whom the sycamore maple mainly roots into a depth during the initial stages and the development of other root ... growth direction and beginning to branch from the tip. In the further development the taproot will lose its dominant position, its diameter often becoming smaller than that of other positively...
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Báo cáo lâm nghiệp: "Age-related physiological and structural traits of chestnut coppices at the Castelli Romani Park (Italy)" pot

... traits of the stands. In particular the correlations pointed out the increase of LAI with the increase of DBH, BA, SHOd and DH, until a maximumvalue falling in turn in the range 10–17 years. The ... stands and significantly (P < 0.001) decreased in the following years, being 7% of the initial value at the end of the time-rotation (30 years).Shoot DBH and DH increased linearly with the ... system of this plant species, carbohydrate reserves of the stool and the invigorating effects of decapitation which could cause an ini-tially fast growing of the coppice sprouts, according to the results...
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Báo cáo lâm nghiệp: "Differential photosynthetic and survival responses to soil drought in two evergreen Nothofagus species" docx

... efficiency of PSII in the light (∆F/Fm) and photochemical quenching (qP) were always lower in N. nitida and along with the photochemical efficiency in the dark (Fv/Fm) they declined in both species. ... drought intensity [6] the same PPFD became probably saturating at a Ψmlower than−2.5 MPa, producing the increase of NPQ in N. dombeyi and the concomitant decrease in Fv/Fm, ∆F/Fm and qP. In conclusion, ... we selected the 90 most even-sized plants of each species, with heights of 20−40 cm. Watering was suspendedfor 80 randomly-chosen individuals of each species, whereas the re-maining 10 were...
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Báo cáo lâm nghiệp: " Managing diameter growth and natural pruning of Parana pine, Araucaria angustifolia (Bert.) O Ktze., to produce high value timber" ppt

... and original (B) model.Managing diameter growth 173activities are finished the volume of the knotty core remainsconstant and the wood outside this core increases in value as the diameter of ... base is defined as the height of the first livingbranch of the tree above ground. The fourth working step is closely related to the third because wethink that the height above ground of the lowest ... consistent in terms of the biology of the system. Both height and age have a positive sign which meansas height and age increase so does the height of the crown aboveground. On the other hand, dbh...
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Báo cáo lâm nghiệp: "Response to natural and simulated browsing of two Mediterranean oaks with contrasting leaf habit after a wildfire" docx

... Moreover, browsing matched the two species in most of the size variables considered, cancelling the advantage in height and crown projection of the deciduous oak at the beginning of the resprouting process. ... 3), with individuals of both species browsed at the begin-ning of winter reaching lower crown projection at the end of the study. This negative impact of browsing just at the onset of the non-vegetative ... (A, in cm) and crown projection (B, in m2 )of sprouting Q. cerrioides (solid bars) and Q. ilex stumps (open bars) in control and in browsed plots in the study of the sensitivity of the twospecies...
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Báo cáo lâm nghiệp: "Picea glauca dynamics and spatial pattern of seedlings regeneration along a chronosequence in the mixedwood section of the boreal forest" potx

... essentialfor the success of this species, especially for providing the basalarea and the recruitment of the second wave of seedlings oradvanced regeneration associated with the opening of the canopy.Logs ... the total basal area in a 16 y stand and remained the dom-inant tree species until 93 y. Picea glauca dominated the treecanopy between 93 and 172 y coinciding with increasingP. tremuloides mortality. ... thickness of LFHincreased along the chronosequence from an average of 6.4 cm in the 5 y stand to 13 cm in the 172 y stand (Fig. 5A). Thisincrease in LFH was accompanied by a significant decline in seedling...
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Báo cáo lâm nghiệp: "Modelling canopy conductance and stand transpiration of an oak forest from sap flow measurements " docx

... 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 ... 35-year-old sessile oak stand(Quercus petraea) regenerated from seed.Other species growing in the understoreywere removed (mainly Tilia and Carpinus) in order to maintain a monolayer ... in the case of the oak stand using higherfor LAI increasing from 1 to 6, for a fixed value of Rg = 500 W.m-2. The case of Rg = 100 W.m-2is also shown in figure...
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Báo cáo lâm nghiệp: "Morning, noon, or afternoon: does timing of direct radiation influence the growth of Picea abies seedlings in mountain forests?" pptx

... H the height (mm) and TSL the terminal shoot length in 2002 (mm) of the seedlings. We did not usebiomass gain as a target parameter since no data on the basal diameterat the beginning of the ... sunflecksoccurred mainly early in the morning or late in the evening. In contrast, in the treatments ‘noon’ and ‘control’ the input of unplanned direct energy was substantial (Fig. 4). In the treat-ment ... beseen in the context of an average clouding of about 60–70% on the site in the years 2001 and 2002 during summer [14]. The direct energy input in the treatment ‘afternoon’, which wehypothesized...
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Báo cáo lâm nghiệp: "Post-transplant root and shoot development in Abies nordmanniana Spach. seedlings after whorl bud and branch pruning" potx

... transplanting the number of root tips was 433 ± 18 asa mean of all treatments, and from transplanting until the first sampling in June this increased in all three treatments(Fig. 1b). In July, the ... is indicated by different let-ters. The development in root DW remained low in the periodfrom transplanting to the first sampling in June (Fig. 2a).From June to July an increase was observed in ... 402 development can be used to advantage in improving the suc-cess rate of transplanting also other conifer species in the for-est. Root growth studies are laborious and time consuming and are...
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