Báo cáo lâm nghiệp: "fumigation of Norway spruce at timberli

Báo cáo lâm nghiệp: "fumigation of Norway spruce at timberline" pdf

... Measurements were taken at light saturation, leaf temperatures of 21°C (1986) or 18°C (1987) and at a relative vapor pressure deficit of 10.6 Pa/kPa. Chlorophyll fluorescence of small ... parameters. Stomatal conductance In no case investigated did 03 treatments reduce stomatal conductance to values lower than those of control twigs. On the co...

Ngày tải lên : 09/08/2014, 04:20

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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

... degree of threat to spruce stands and the degree of degradation of their sites depends on the origin, species composition, period of the inﬂuence of spruce on soil as well as on the negative ... in one-year-old spruce needles, the disturbance becomes more profound with an increase in the degree of the threat of disintegration to stands. Disturbances of the relation...

Ngày tải lên : 07/08/2014, 10:21

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Báo cáo lâm nghiệp: "properties of Norway spruce timber. Comparison between fast- and slow-grown stands and influence of radial position of sawn timber" pdf

... paper presents information and data related to the effects of the raw material parameters on the mechanical bending properties of structural timber. 1.1. Scope of two studies ... sys- tematic comparisons of mechanical properties and existing variations in material properties and sawing patterns are lack- ing. In recent years and in various par...

Ngày tải lên : 09/08/2014, 04:20

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Báo cáo lâm nghiệp: "Measurement of free shrinkage at the tissue level using an optical microscope with an immersion objective: results obtained for Douglas ﬁr (Pseudotsuga menziesii) and spruce (Picea abies)" potx

... portion of tissue con- cerned is isolated from the rest of the material (in terms of kinematics), an image of this zone (R-T plane) is grabbed at a certain water content (generally at saturation) ... addition of a point, – removal of a point, – zoom on problematic zones, – translation of the zoomed zone, with automatic updating of the two chains of reference points, etc....

Ngày tải lên : 07/08/2014, 16:20

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Báo cáo lâm nghiệp: "Storage of non-dormant hardwood seeds" pdf

... can now choose the date of sowing in relationship to good climatic; conditions, whereas form- erly the date was determined by the beginning of the pretreatment (hence 1-8 mo ... large scale with Fagus silvatica in the seed plant of the French Office National des For6ts with high hopes of yielding sub- stantial improvement in production of be...

Ngày tải lên : 09/08/2014, 04:20

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Báo cáo lâm nghiệp: "Response of the Norway spruce (Picea abies [L.] Karst.) root system to changing humidity and temperature conditions of the sit" ppt

... analyses indicate that the causes of the decline are as follows: planting of Norway spruce outside the optimum of its ecovalence, increased global radiation, weather course change (periods of drought), ... of solar radiation on the soil in the existing Norway spruce groups of stands. CONCLUSION e Norway spruce decline and dieback in lower forest altitudinal veget...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "Effect of stand segmentation on growth and development of Norway spruce stands" pps

... the ra - tionalization of young spruce stand tending (A 1977). One part of this series, Machov CZ 14 experi- Eﬀect of stand segmentation on growth and development of Norway spruce stands J. ... analysis of a part of results from the international IUFRO trial CZ 14 Machov investigat- ing the eﬀect of stand segmentation (track width) on production characteristics and...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "derivation of target stocking for forests of norway spruce vegetation zone in slovaki" pptx

... ratio of crown length to tree height), conditions for the formation and development of natural regeneration, coverage of natural regeneration and cover - age of ground and non-wood vegetation ... water protection ones), securing static stability and preconditions for the formation and growth of natural regeneration. We investigated the relations between stocking and indicators...

Ngày tải lên : 07/08/2014, 03:22

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Báo cáo lâm nghiệp: "Merocoenoses of cambioxylophagous insect fauna of Norway spruce (Picea abies [L.] Karst.) with focus on bark beetles (Coleoptera: Scolytidae) and types of tree damage in diﬀerent gradation conditions" ppsx

... population of Ips typographus – en- demic situation (Forest District Ostravice, CR) by evaluating a total of 1,536 spruce stems, the total length of which was 44,396 m. Of this, a total of 826 ... present. High rates of their development inhibit the occurrence of I. typographus. In the Czech Republic today approximately one third of spruce stands is threatened by path...

Ngày tải lên : 07/08/2014, 10:21

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Báo cáo lâm nghiệp: "Transformation of solar radiation in Norway spruce stands into produced biomass – the effect of stand density" doc

... its relatively easy estimation. e real estimation of RUE is dependent on an appropriate measurement of absorbed PAR and accurate measurement of the biomass increment. e main advantage of this ... from May to October) air temperature and sum of precipitation in 1998–2003 are shown in Table 1. e investigated mountain cultivated even-aged plantation of Norway spruce was 17...

Ngày tải lên : 07/08/2014, 10:21

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