Báo cáo lâm nghiệp: "Soil-forming effect of Grand fir (Abies grandis [Dougl ex D Don] Lindl )" pot

... 533–539 539 Půdotvorná funkce jedle obrovské (Abies grandis [Dougl. ex D. Don] Lindl. ) ABSTRAKT: Cílem studie bylo zhodnocení funkce jedle obrovské (Abies grandis [Dougl. ex D. Don] Lindl. ) jako ... 2009 (12): 533–539 533 JOURNAL OF FOREST SCIENCE, 55, 2009 (12): 533–539 The introduction of Grand fir (Abies grandis [Dougl. ex D. Don] Lind...

Ngày tải lên: 07/08/2014, 10:22

... output. MATERIAL AND METHODS Description of the area under study e Krušné hory massif is formed of undulated plateaus of NW exposure and altitude mostly be- tween 700 and 1,000 m above sea ... scarified with excavators and bulldozers, relatively intact soil horizons not afflicted by air pollutants were de- nuded and uniform reliefs of windrows were formed (V et al. 2006). Rem...

Ngày tải lên: 07/08/2014, 03:22

... current needles during dormancy fluctuated on all studied plots during the period of 2000–2005 (Fig. 6) and no statistically significant differences were detected among all stud- ied plots. us ... in 2005. e spruce stand is divided into two partial plots with different stand density (FD – dense stand, FS – sparse stand). e area of each studied plot is 0.25 ha. Dolomitic limestone (3...

Ngày tải lên: 07/08/2014, 10:21

... II. P values and degrees of freedom (df) from the analysis of variance of survival, diameter, height and volume index for seedlings planted on sites 1 and 3. Effect df Survival Diameter Height ... of species in the raspberry- hardwood complex maintained low levels of light availability and greatly reduced seedling height and diameter growth. Such results are in accordance with the...

Ngày tải lên: 08/08/2014, 01:21

... stand in Lüchow (fig 4b). Frost hardiness of bark tissue from defoliated and nondefoliated oaks Compared to nondefoliated trees, defoliated sessile and pedunculate oaks tended ... hardiness". Indeed, it had been shown that Scots pine and Norway spruce trees fertilized with nitrogen showed reduced frost hardiness of needles and higher amounts o...

Ngày tải lên: 08/08/2014, 18:21

... individual needles and on within-shoot shading. Needle photosynthesis was approximated by measuring the photosynthesis of ’thinned’ shoots in a diffuse radiation field. Within-shoot ... silhouette to total needle area ratio of 93 shoots (3 trees/stand) were mea- sured. The photosynthesis of excised shoots was measured in a diffuse radiation field us...

Ngày tải lên: 09/08/2014, 04:20

... Frederiksborgvej 399, D- 4000, Roskilde, Denmark, and 4 1nstitute of Plant Ecology, University of Copenhagen, 0 Farimagsyade, 2D Dli353. Copenhagen, Denmark Introduction Much of ... and Davison, 1988; Lucas et al., 1988) particularly at the start and end of the winter period (i.e., during hardening and dehardening). It is suggest- ed from the d...

Ngày tải lên: 09/08/2014, 04:20

... whole extent and rate of the disturbance of stands because a considerable part of damaged wood remains in stands (due to uneco- nomic processing) and so conditions are created for the reproduction ... upper and the lower side of the lying breaks-off differ in the intensity of attack and the degree of cover of these species. In young broken and open stands with the unprocessed w...

Ngày tải lên: 07/08/2014, 04:20

... phe- nological phases were considered [27]: (V1) bud dormancy; (V2) swollen bud next to the opening; (V3) swollen bud and bud burst, with folded leaves; (V4) bud just opened and young open leaves; (V5) ... complex process which is also induced by the lack of light and cold- ness [4]. The meteorological analysis evidenced a different be- haviour of the temperatures (minimum and maximum) rec...

Ngày tải lên: 07/08/2014, 16:21

... Equations derived by fitting to data from all sites gave a mean difference between predicted and measured biomass that was smaller than the standard deviation (SD) of the mean error of prediction obtained ... georeferenced national soil pedon dataset [43]. Any samples that might have come from sites associated with recent land use change were excluded. The best predictor was an additive...

Ngày tải lên: 08/08/2014, 00:22