Báo cáo lâm nghiệp: "Dendrochronology of pedunculate oak (Quercus robur L ) in an old-growth pollarded woodland in northern Spain: establishment patterns and the management history" ppt
Báo cáo lâm nghiệp: "Dendrochronology of pedunculate oak (Quercus robur L.) in an old-growth pollarded woodland in northern Spain: establishment patterns and the management history" ppt
... com-plete pollarded woodlands.This work is a dendrochronological reconstruction of the management history in Tragamón, an old-growth oak wood-land located in the Cantabrian lowlands, northern ... decreased,particularly since 1917 in mature trees, and since 1905 in old-growths (Figs. 4 and 5). The loss of the pollarding practice,especially during the 20th century, could cause the collapse of many old-growth ... borers in autumn 2000. Totals of 52 mature oaks, all of them in La Isla, and 57 old-growth oaks, seven of them belonging to La Isla and 50 to Tragamón, were sampled for tree-ring analysis. Old-growth chestnut...
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Báo cáo lâm nghiệp: " Dendrochronology of pedunculate oak (Quercus robur L.) in an old-growth pollarded woodland in northern Spain: tree-ring growth responses to climate" pptx
... responses of radial growth in pedunculate oak (Quercus robur L. ) to climate wereinvestigated in an old-growth woodland in the Cantabrian lowlands, northern Spain. This was done by using correlation analysis, ... of an age-independent climate-growth relationship for oak in the studied locality is unreliable, and anticipate the probable responses of oaks growing in old-growth woodlands to global climatic ... coexisting, discrete oak age-classeswould appear to be an important first step in understanding and anticipating the responses of old-growth pollarded woodlandsto future climatic changes in Europe.Acknowledgements:...
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Báo cáo lâm nghiệp: "Evapotranspiration of a declining Quercus robur (L.) stand from 1999 to 2001. I. Trees and forest floor daily transpiration" ppsx
... behaviour [39 ]), the low oak LAI (cater-pillars and decline) can explain those low rates of transpiration,which in turn can explain the low T/PET, PET being relativelyvery much higher and therefore ... respec-tively 3.6, 3.1 and 3.5 in the thinned plot (75% from pedunculate oak, 14% from Q. rubra and 5% from Acer) and 4.3, 3.7 and 4.2 in the con-trol plot (53% from pedunculate oak, 25% from Acer and ... cited daily values of 2–3 mm d–1 in oak [6, 10]. In this case, these low values couldbe attributable to the low LAI or eventually local dryness. Oak LAI is effectively lower than LAI of healthy...
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Báo cáo lâm nghiệp: "Evapotranspiration of a declining Quercus robur (L.) stand from 1999 to 2001. II. Daily actual evapotranspiration and soil water reserve" potx
... Control).Evapotranspiration in a declining oak stand 621was deficitary (–78 mm) in leafy period, in particular in May(–11.6 mm) and July (–32.5 mm). Rainfall interception (In %) during the leafy ... sessile oak stand with LAI of 3.3. The intra- and inter-annual variations,not always well correlated with LAI, probably result from(i) the type of rain and (ii) climatic conditions; for instance,slight ... ondaily PET and on a relative LAI (LAIi/LAImax), with i standingfor the day and LAImax standing for the maximum LAI of the year. For periods of constant LAI, oak transpiration wasdeduced by interpolation...
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Báo cáo lâm nghiệp: "Autoécologie des chênaies de Quercus robur L. en Galice (Espagne)" pdf
... GaliceAbstract – Autoecology of oaks (Quercus robur L. ) in Galicia (Spain). A parametric characterization of the biotypes currently in stands of “carballo” (Quercus robur L) in Galicia (Spain) is presented. ... R., The ecology and silviculture of oaks, CABI Publishing, Wallingford, 2002.[41] Kelly D .L. , The regeneration of Quercus petraea (sessile oak) in southwest Ireland: a 25-year experimental study, ... studied oaklands wereelaborated. This information has permitted the determination of the fisiographic, climatic and edaphic habitat of Quercus robur in central and marginal area in Galicia, as well...
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Báo cáo lâm nghiệp: "Effects of defoliation on the frost hardiness and the concentrations of soluble sugars and cyclitols in the bark tissue of pedunculate oak (Quercus robur L.)" potx
... vacuum, and 200 L pyridine and 50 L of a mixture of N,O-bis(trimethylsilyl)-trifluoracetamide (BSTFA) and trimethylchlorosilane (volume combination 9 + 1) were added. Forsilylization, the samples ... CHNOS-analyzer (vario EL III, Ele-mentar-Analysensysteme, Hanau, Germany), with acetanilide as astandard. For the determination of soluble sugars and cyclitols, 20 mg of the lyophilized and pulverized bark ... the trunks, and obviously represented one of the factors thatresulted in an episode of oak decline in Northern Germany [19]. Generally, the seasonal development of frost hardiness isclosely linked...
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Báo cáo lâm nghiệp: " Growth of wild cherry (Prunus avium L.) in a mixture with other species in a demonstration forest" ppsx
... suppressed. eir qual-ity is low but they ful l their auxiliary role in stands and therefore they could be kept in the stand for the nearest future.e slenderness quotient has an increasing ten-dency ... depicting two layers of wild cherry trees in the stand. e vertical and horizontal structure analysis also shows that in middle aged stands wild cherry trees which are still vital could be ... groups of wild cherry trees in the stand belonging to dominant/codominant and suppressed tree classes. Height periodic increment (measured between the years 2001 and 200 7) is significantly (p <...
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Báo cáo lâm nghiệp: "Stability of Norway spruce (Picea abies [L.] Karst.) stands in the Beskid Śląski and Beskid Żywiecki Mts. from the aspect of their nutrition status" pptx
... medium-skeletal in their organic-mineral layers, and strongly or very strongly skeletal (stony) in deeper layers. In their granulometric composition these are mostly medium and light clays and sometimes ... diminishes), and rapidly decreasing content of calcium (Tables 2 and 3). A similar distri-bution of the forms of magnesium and a low content of calcium, especially in the deeper layers of the profiles ... of needles in all the analyzed groups of stands is on the decrease for the growth of trees and, in the first year also in the group of stands strongly threatened with disintegration (STH)....
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Báo cáo lâm nghiệp: " Consequences of increased deer browsing winter on silver fir and spruce regeneration in the Southern Vosges mountains: Implications for forest management" potx
... types with low levels of fir browsing, and an abundance of spruce regeneration containing browsedfir seedlings (Fig. 1). An analysis of the global level of brows-ing (grouping all types of regeneration) ... wolves), and more recently, to the rapid rise in ungulate populations [28,53]. These changes in forest and wildlife management modified the interactions between plants and animals, especially ... correspondenceConsequences of browsing on fir regeneration 179 The analysis of the global level of browsing (grouping alltypes of regeneration) revealed that firs were browsed in a com-parable way in all stand types,...
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Báo cáo lâm nghiệp: "Conversion of a natural broad-leafed evergreen forest into pure plantation forests in a subtropical area: Effects on carbon storage" pps
... cochinchinensis and Symplocos stel-laris) in the NF, 12 of C. kawakamii in the CK, 11 of O. xylocarpa in the OX, 12 of F. hodginsii in the FH, and 12 of Chinese fir in the CFwere felled. The selected ... rainfall, steep slopes and fragilesoil are characteristic, the establishment management practicesfor plantations in the initial years, including clearing of originalvegetation, burning of ... forest and 155 Mg ha–1 in Tall Bana forest) [10] and sixCentral American lowland tropical forests (average of 146Mgha–1 ) [35], and lower than that of a native rain forest(340.467 Mg ha–1 ) in...
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