Báo cáo lâm nghiệp: "New insights in the recognition of the European ash species Fraxinus excelsior L and Fraxinus angustifolia Vahl as useful tools for forest management" pdf
Báo cáo lâm nghiệp: "New insights in the recognition of the European ash species Fraxinus excelsior L. and Fraxinus angustifolia Vahl as useful tools for forest management" pdf
... 733c INRA, EDP Sciences, 2006DOI: 10.1051 /forest: 2006054Original articleNew insights in the recognition of the European ash species Fraxinus excelsior L. and Fraxinus angustifolia Vahl as useful ... morphological or genetic,can be insufficient for efficient separation of groups, as it is the case for the common ash (Fraxinus excelsior L. ) and the narrow-leaved ash (F. angustifolia Vahl. ) in Western ... Common ash (Fraxinus excelsior L. ) and narrow-leaved ash (F. angustifolia Vahl) are the most common ash species in Western Europe. The former is considered to be a highly valuable timber tree and...
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Báo cáo lâm nghiệp: "Multivariate statistical approach to comparison of the nutrient status of Norway spruce (Picea abies [L.] Karst.) and top-soil properties in differently managed forest stands" potx
... functional connection of roots with the soil as well as with the other tissues of the plant is related to soil water-holding capacity and to the potential of ion exchange reactions. In case that the ... plotsStudy plots were selected on the basis of compa-rable conditions of the spruce forest altitudinal zone and ecological series with generally identical soil-forming processes (podzolization) and ... Especially the acquisition of forest and soil data was restricted by a small sample size (M et al. 2001).e closeness of the correlation of element cycles with organic matter increases in...
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Báo cáo lâm nghiệp: "Compression stress in opposite wood of angiosperms: observations in chestnut, mani and poplar" ppsx
... poplar are also shown,including measurements of RGS and micro-fibril angle.2.1. Residual growth strain (RGS)Various methods are available for measuring RGS. They arebased on the same principle, ... principle, which consists in measuring the lon-gitudinal strain at the wood surface, after artificially releasing the stress [15,30]. For chestnuts and mani, the “single hole” method wasused [11, 15]. ... change in the orientation of their stem and branches. These constraintsare environmental, such as soil instability or damage due to the action of wind or snow, as well as biological, such as the weight...
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Báo cáo lâm nghiệp: "Age trends in genotypic variation of wood density and its intra-ring components in young poplar hybrid crosses" doc
... Québec. All sites wereoriginally abandoned agricultural land. Each clonal trial was estab-lished in a randomized complete block design, with ten blocks each.Clones were planted in row plots, ... homogeneity of clonal variances and the level of truegenetic variances within each hybrid cross. Therefore, instead of analysing within each hybrid the analysis was carried outon all hybrids pooled. These ... density of each ring and ring area, and allowed for an estimate of average wood density of the whole disk of a tree trunk. Dry fiber weight for each ring was calcu-lated by multiplying an average ring...
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Báo cáo lâm nghiệp: "Nutrient dynamics in decomposing needles of Pinus luchuensis after typhoon disturbance in a subtropical environment" pps
... leaching. The rapid release of K and Mg in the early phase observed in the present studycould be attributed to the physical removal by leaching. The release of the other elements might be controlled ... was measured for two needletypes, i.e. typhoon-generated and normally fallen needles. The twotypes of needles were collected with litter traps at the same plot dur-ing the peak fall in July ... de-crease phase (net release), while Al and Fe showed an increasephase (net immobilization), and P, S, and Mn demonstrated anincrease-decrease phase (initially net immobilization and thennet release)...
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Báo cáo lâm nghiệp: "Mineral nutrition in relation to the Norway spruce forest decline in the region Horný Spiš (Northern Slovakia)" docx
... seedlings were planted in the soil from the decomposing stand and compared with both yellowing and green seedlings planted in the soil from the beech stand (Table 8).Phenomena of decline in two spruce ... we selected several seedlings from the air-pollution plot in the Hliníky locality in two modifications − with symptoms of needle yellowing and apparently green seedlings without visible symptoms ... had the following six vari-ants:– Spruce seedlings with visible symptoms of yellow-ing needles in the soil substrate from the air-pol-lution plot Hliníky (10 seedlings);– Spruce seedlings...
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Báo cáo lâm nghiệp: "Timber harvesting in the ukrainian carpathians: Ecological problems and methods to solve them" ppsx
... from the forestry point of view, mineralized plots play a positive role because they as- sist in the natural renewal of forests, especially in the case of unclear cutting. e average volume of ... basic passages established without us-ing engineering structures and drainage and have rather large longitudinal inclines, which in most cases does not allow using them for the passage of ... damage is mainly plain and local. ird category: ere are plots with linear dam-age in the form of primary skidding tracks (made by one trunk). It includes single and multiple pas-sages of a tractor...
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Báo cáo lâm nghiệp: "Available nitrogen in the surface mineral layer of Serbian forest soils" docx
... are in the range of 10.31–12.79, which is usual for forest soils. Except the soil under the black locust forest, the ammonium form of nitro-gen is the dominant form of easily available miner-alN. ... from the following formula:IM =totalinitialmin– NNN (2)where: Nmin ‒ quantity of mineralized N without subtraction of the initial content of available mineral N (for the anaerobic incubation ... ect the level of experimental crop yield. Be-sides, neither the content of easily available mineral forms of N nor the total quantities of the N fraction derived from the soil in the crop and...
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Báo cáo lâm nghiệp: "A change in structural diversity and regeneration processes of the spruce virgin forest in Nefcerka NNR (TANAP) in relation to altitude" docx
... relation with the altitude and developmental stage of the virgin forest is shown in Table 1 and in Fig. 1.Based on an analysis of the plots of the spruce virgin forest representing the growth ... the individuals from natural re-generation (individuals of the height below 130 cm) is declining in all stages of the virgin forest with the increasing altitude. is is caused by worse ecologi-cal ... forest. Long-term monitoring of natural forests of this forest vegetation level has revealed so far remarkable differences in the process of developmental stages, in the dynamics of forming the stand structure...
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Báo cáo lâm nghiệp: "Climatic signal in annual growth variation of silver fir (Abies alba Mill.) and spruce (Picea abies Karst.) from the French Permanent Plot Network (RENECOFOR)" ppsx
... storage and growth of the following year. Warm-ing in winter could also decrease embolism [33], advanceleaf unfolding and lengthen the growing season the follow-ing year [31]. Different process-based ... mountains, Ann. For. Sci. 62 (2005) 761−770.[42] Rolland C., Tree-ring and climate relationships for Abies alba in the internal Alps, Tree-ring Bull. 53 (1993) 1−11.[43] Rolland C., Desplanque ... Holmes R .L. , Computer-assisted quality control in tree-ring dating and measurements, Tree-Ring Bull. 43 (1983) 69−78.[28] Lebourgeois F., Climatic signals in earlywood, latewood and totalring...
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