Báo cáo lâm nghiệp: "Extent and distribution of beech (Fagus sylvatica L ) regeneration by adult trees individually dispersed over a spruce monoculture" ppsx

... hold only sporadically with very low density and the model illustrates only 5% of total variability in this case. In the fenced area the model illustrated 63% of total variability (Table 3). ... petraea and Corylus avellana. Vegetatio, 125: 193–205. K G., C T., J L. (200 4): Spatial pattern of beech (Fagus sylvatica L. ) and oak (Quercus pubes...

Ngày tải lên: 07/08/2014, 10:21

... length and the soil depth and it has almost a linear character in the mineral soil. e comparison of the amounts of explained variance (r 2 ) and the parameters of the linear and nonlinear ... Neverthe - less, it still remains close to the mean value of the above-mentioned range. e total length of fine roots was analyzed accord- ing to individual sample plots and...

Ngày tải lên: 07/08/2014, 10:22

... axes. L influence de la lumière sur la morphologie des plants à été étudiée dans le Massif de l Aigoual dans des régénérations naturelles. Abondante, la lumière favorise l apparition ... étudier la variabilité génétique Cette étude a été réalisée dans quatre plantations comparatives de provenances installées en pleine lumière par la Station d’Am...

Ngày tải lên: 09/08/2014, 06:21

... tall, support a relatively low leaf area and have crowns that are well above the forest floor [37]. Relatively high lateral light penetration in these Douglas-fir stands would lead to smaller ... function of elevation angle in (A) aspen, Jack pine and spruce stands and (B) red alder and Douglas-fir stands. Angular distribution of diffuse PAR 49 RLR sensor beneath aspen and...

Ngày tải lên: 08/08/2014, 00:22

... accompanied by aggradation stage of the middle layer. Advanced natural regen- eration mainly of beech and sporadical silver fi r, sessile oak, rowan, sycamore maple, Norway maple, small-leaved linden, ... species are represented by less than 1% (sessile oak, Crataegus monogyna, rowan, syca- more maple, Norway maple, small-leaved linden, spruce and Sambucus recemosa). Indivi...

Ngày tải lên: 07/08/2014, 10:21

... Survival and damage of seedlings were calculated as a percentage of the number of living individuals from the total number of outplanted seedlings and damaged individuals from the number of survived ... 355 Related to survival, similar results like in this study were reported by L  (199 0) in detailed anal- ysis of Norway spruce plantations at the altitude...

Ngày tải lên: 07/08/2014, 10:21

... min per turn for opera- tional, mechanical and personal delays, respectively. Obviously, mechanical delays are the most frequent. After the mechanical delays, operational delays were the most ... al. 200 8). Table 1 shows the characteristics of the study area. Dominant canopy species include Fagus orientalis, Carpinus betulus, Acer velutinum, Alnus subcordata and Ulmus glabra. ...

Ngày tải lên: 07/08/2014, 10:21

... with a nonlinear model of basal area increment for beech developed by Cescatti and Piutti [10], where 88% of the variability of tree basal area increment was explained by tree diameter and a competition ... replaced by the fully numerical 1–9 scale using the van der Maarel transformation [32]. Vegetation data were analysed using cluster analysis with the Euclidean distan...

Ngày tải lên: 07/08/2014, 16:20

... of the trees (with SSR data available) bearing the S haplotype (13 South-eastern Tasmania, 2 North-eastern Tasmania) and all individuals bearing haplotypes Cc41 and Cc56 (9 South- eastern Tasmania, ... (199 8) 25–40. [37] Steane D .A. , Vaillancourt R.E., Russell J., Powell W., Marshall D., Potts B.M., Development and characterisation of microsatellite loci in Eucalyptus globul...

Ngày tải lên: 07/08/2014, 16:21

... height measured between the collar and the last living bud before transplanting and at 2 and 7 months after planting out. 2.3. Statistical analysis A single factor analysis of variance (ANOVA) was ... in 6 rows of 30 plants each with a square spacing of 1 m. The planting site was on reclaimed land, having a moderately deep clay layer and poor drainage. Plant growth rates w...

Ngày tải lên: 08/08/2014, 00:22