Báo cáo lâm nghiệp: "On the occurrence of web-spinning sawflies of the genus Cephalcia (Hymenoptera, Pamphiliidae) in the Czech Republic" potx

... 57–62Because of the lack of a recent survey of Cephal-cia species in the Czech Republic, the goals of this study were (i) to monitor web-spinning sawflies liv-ing on spruce in mountainous regions ... species occurrence. Canonical axes explain 65.8% of variability J. FOR. SCI., 53, 2007 (Special Issue): 57–62 59Table 1. Survey of studied web-spinning sawflies of the genus Cephalcia in the Czech ... periods of the Cephalcia species flight activities (cf. M- 1988). e flight activity started in the stud-ied localities at the end of May or at the beginning of June depending on the actual...

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

... diﬀerences in the root system development and health condition were found either between the trees of identical height from self-seeding and from planting in the region of Krušné hory Mts. and in the ... 452–461JOURNAL OF FOREST SCIENCE, 53, 2007 (10): 452–461 Root system development and health condition of sycamore maple (Acer pseudoplatanus L.) in the air-polluted region of Krušné hory Mts.O. ... trees of the same height from planting with severe and small root system deformations in the region of Krušné hory Mts. and in the region of Bohemian-Moravian Up-land.(7) Mutual comparison of...

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

... 10.1051/forest:2007005Original articleGrowth, allocation and leaf gas exchanges of hybrid poplar plants in their establishment phase on previously forested sites: effect of different vegetation management ... biomass allocation and leaf carbon assimilation was investigated in two plantations(1- and 2-year-old) established in previously forested sites of south-eastern Québec. Any vegetation control ... 2006)Abstract – The effect of different vegetation control methods (mowing and cultivation between plantation rows, herbicide application and cover plantsowing) on hybrid poplar (P. maximowiczii...

Báo cáo lâm nghiệp: "A method for describing and modelling of within-ring wood density distribution in clones of three coniferous species" ppt

... expectedchange in distribution of within-ring density for one sd increase in ring width is presented in Figure 3. 3.4. Differences among clones in within-ring density Fluctuations in growth rate and within-ring ... relativecontribution of clone differences to the overall variation in shape of within-ring frequency distributions of wood density. 3. RESULTS 3.1. Statistics describing within-ring distribution of wood density ... Statistics describing within-ring distribution of wood density Frequency distribution of multiple within-ring density classes wasfirst visually examined using histograms. Some distribution...

Báo cáo lâm nghiệp: " Managing diameter growth and natural pruning of Parana pine, Araucaria angustifolia (Bert.) O Ktze., to produce high value timber" ppt

... 2005DOI: 10.1051/forest:2005008Original article Managing diameter growth and natural pruning of Parana pine, Araucaria angustifolia (Bert.) O Ktze., to produce high value timberLeif NUTTOa, Peter ... present work was to analyse diameter growth and the relationship of natural pruning and various morphologicalcharacteristics of Parana pine (Araucaria angustifolia (Bert.) O Ktze.) growing on different ... diameters and short rotations of 30 to 40 years of Parana pine in southern Brazil.The only reasonable alternative is to artificially prune Parana pine in order to increase the proportion of valuable...

Báo cáo lâm nghiệp: "Leaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications on its drought resistance capacity" ppt

... 10.1051/forest:2005024Original articleLeaf and whole-plant water relations of the Patagonian conifer Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications on its drought resistance capacity Javier ... Pastorino M.J., Genetic variation and reproduction system of Aus-trocedrus chilensis (D. Don) florin et Boutelje, a cypress endemicto the Andean -Patagonian Forest, Ph.D. thesis, Cuvillier Verlag,Göttingen, ... conifère de Patagonie Austrocedrus chilensis (D. Don) Pic. Ser. et Bizzarri: implications pour sa capacité à résister à la sécheresse. Des études physiologiques suggèrent que l Austrocedrus chilensis...

Báo cáo lâm nghiệp: "Morning, noon, or afternoon: does timing of direct radiation influence the growth of Picea abies seedlings in mountain forests?" pptx

... amount of direct sun-light enhances the growth of P. abies seedlings in subalpineenvironments, the timing of exposure to direct sunlight is lessimportant. The pathways of influence of direct ... treatment). Like the other seedlings, these seedlings were either potted (32 seedlings) or outside pots (8 seed-lings). However, we did not include these seedlings in the statisticalanalysis since this ... in order to avoid missing data as a result of seedling mortality. However, out of the total number of seedlings of 6 ì 4 ì 10 = 240, only four seedlings had died from planting by the end of the...

Báo cáo lâm nghiệp: "Tension wood occurrence in three cultivars of Populus × euramericana. Part I: Inter-clonal and intra-tree variability of tension wood" ppsx

... most planted cultivars in Valley of Cinca(Spain): I214, Luisa Avanzo and I-MC, as well as the intra-tree variability. We present here the distribution of tension wood in nine stems of poplar rapidly ... Lean in red alder (Alnus rubra): growthstress, tension wood, and righting response, Can. J. For. Res. 26(1996) 1951–1956. Tension wood variability in three cultivars 29the production of TW increased ... skeleton of the standing tree, (B) reconstruction of thetree shape and of the sampled discs, (C) disc measurements: growthrings and tension wood. Figure 2. Tension wood areas from the cultivars...

Báo cáo lâm nghiệp: "Age-related physiological and structural traits of chestnut coppices at the Castelli Romani Park (Italy)" pot

... sativa in the Castelli Romani Park, due to the favourable climatic and soil conditions for the species. Although the intensive exploi-tation of this area, the analysed coppice showed the great capac-ity ... indicator of potentialproductivity in response to changing factor [23, 25, 26, 42]. The analysis of the physiological traits trend underlined the importance of these traits as indicator of the resources ... different periods of the vegetative cyclereflected the trend of physiological traits. The results wereindicative of chestnut adaptability to environmental constraints and of its functional...

Báo cáo lâm nghiệp: " On the niche breadth of Fagus sylvatica: soil nutrient status in 50 Central European beech stands on a broad range of bedrock types" potx

... 355c INRA, EDP Sciences, 2006DOI: 10.1051/forest:2006016Original article On the niche breadth of Fagus sylvatica: soil nutrient status in 50 Central European beech stands on a broad range of bedrock ... among the sites than do actually exist in the main rooting horizon. A major disadvantage of our study is the lack of appropriatedata on N availability in the soils. Although N mineralizationrate ... 0.02(Ca + Mg + K)tand base saturation in the mineral soil are key factors for the accumulation of C and N in the organic layer. The total pool of phosphorus was particularly large in the organic...

Báo cáo lâm nghiệp: "Response to natural and simulated browsing of two Mediterranean oaks with contrasting leaf habit after a wildﬁre" docx

... latewinter to early summer, and eat foliage, shoots and acorns of oaks insummer and autumn [20]. We have carried out two different studiesin these rangelands to assess the effect of post-fire natural and ... Mediterranean oaks with contrasting leaf habit after a wildfireJosep Maria E*, Abdessamad H,JavierRCentre de Recerca Ecològica i Aplicacions Forestals (CREAF) i Unitat d’Ecologia, ... regeneration patterns and restoration practices after a large wildfire in NE Spain: Challengesfor fire ecology and landscape restoration, in: Trabaud L., Prodon R.(Eds.), Fire and Biological Processes,...

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

... tremuloides and the resultantcanopy gaps formed, appear to be critical for P. glauca regen-eration in mature and old stands. Natural regeneration may beenhanced by taking advantage of the advanced regeneration during ... Recruitment pattern of P. glauca seedlings changed along the chronosequence. L(t)analysis (Fig. 4) showed that the spatial distribution of P. glauca seedlings was mainly random in 5, 16, 76, 77 y stands. In ... constituted96% of 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...

Báo cáo lâm nghiệp: "Relationships between hydraulic traits and habitat preference for six Acer species occurring in the French Alps" pptx

... 81Ann. For. Sci. 61 (2004) 8186â INRA, EDP Sciences, 2004DOI: 10.1051/forest:2003087Original articleRelationships between hydraulic traits and habitat preference for six Acer species occurring ... adapted for high water transport. In contrast, plants need to invest less in means of acquiring water for their growth in dry habitats, and therefore reduced in xylemvulnerability and in hydraulic ... by increasing theirresistance to cavitation [13], one of the major causes of decline in the botanical species in the absence of water [5]. In contrast, Acer species are more restricted to their...

Báo cáo lâm nghiệp: "On the durability of Burkea africana heartwood: evidence of biocidal and hydrophobic properties responsible for durability" ppt

... by measuring the diameter of the colony estimated from the mean of two perpendic-ular diameters and expressed as a percentage of the room available for growth, i.e. the diameter of the dish. Growth ... Independently of the nature of the extraction, weight losses observed on Burkea africana blocks are weak, while beech blocks arestrongly degraded. These results suggest that the durability of Burkea africana ... effects of the different extractson the growth of brown rot and white rot fungi. In all cases, asignificant effect was observed on the growth of the myceliumat 100 and 1000 ppm of the different...

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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