Báo cáo lâm nghiệp: "Natural regeneration of sessile oak under different light conditions" pptx

... 2008). e aim of our paper is to compare the effects of different variants of regeneration felling on the successfulness and growth response of sessile oak regeneration at nutrient-rich sites of medium-alti- tude ... openness degree of light intensity transect 364 J. FOR. SCI., 57, 2011 (8): 359–368 e development of diameter and height growth of oak regeneration...

Ngày tải lên: 07/08/2014, 10:21

... effects of acorn size and provenance on the growth of seedlings of sessile oaks, Q. J. For. 57 (1963) 11–19. [17] Jiménez M.N., Ripoll M.A., Navarro F.B., Bocio I., De Simón E., Modification of the ... meth- ods of planting species of the genus Quercus, especially the holm oak (Q. ilex subsp. ballota) and the cork oak (Q. suber). These studies have centred fundamentally on enh...

Ngày tải lên: 07/08/2014, 16:20

... cork oak re- generation loss [12] since the intensity of these different types of predation can vary spatially and temporally among popula- tions. This source of regression in regeneration of cork ... as follows: 1 tree of each provenance per row, at 3 × 2 m spacing. No treatment had been undertaken until the date of sampling. 2.2. Desciption of the site The experimental site...

Ngày tải lên: 07/08/2014, 16:21

... concentration. Light levels in the understory of mature cork oak stands in Spain, can vary from 12 to 70% of incident radiation, depending on the structure of the stand [33]. Mortality of cork oak germi- nants ... 44–50%, LL1: 13.5–16% and LL2: 5–6% of full sunlight). Water relations of cork oak seedlings 379 of the water stress conditions was assured. Analysis of var...

Ngày tải lên: 08/08/2014, 00:22

... mean quantity of light they received were maintained over time. The ANOVA performed on the fifth-year data of light reaching the mid-upper crown of seedlings to evaluate the effect of the release ... competition for four seedling container sizes. Figure 3. Mean quantity of light (PAR, % of full sunlight) reaching the mid-upper crown of four spruce seedling stock sizes dur...

Ngày tải lên: 08/08/2014, 01:21

... that sessile oak in France may be less differentiated than in other parts of Europe studied to date. In general, the genetic differentiation of oak populations is of comparable ... populations of sessile and pedunculate oak. The sample size was 100 2-year-old trees per population, ran- domly collected out of the seed of 1 year and gr...

Ngày tải lên: 08/08/2014, 18:21

... 2004. Initial phase of natural regeneration of beech forests in the national nature reserve of Voděradské bučiny. In: KUPKA I. (ed.), Proceedings of Natural and Artificial Regeneration: Merits, ... dynamics of survival ability of Silver fir and European beech seedlings from natural regeneration under stand in the first year. In: KUPKA I. (ed.), Proceedings of Natural and...

Ngày tải lên: 07/08/2014, 10:22

... showed that spruce can grow through under a bramble cover of less than 0.6, and fir can grow under a cover of less than 0.8 (Fig. 2). In addition to the technique of regeneration in gaps, shade control ... we set up an observation trial in an area of natural regeneration under a canopy gap. This was created specifically for regeneration during the winter of 1987/1988 at...

Ngày tải lên: 08/08/2014, 01:22

... by the sum of shading by the leaf area of higher trees. e radiation on each level of tree canopy is registered with the use of a professional tool for the patch. e available light function ... about an increase of beech forest, which in the course of time achieves a higher degree of similarity to natural stand. In the Ukrainian Beskids the potential forest stand consist...

Ngày tải lên: 07/08/2014, 03:22

... e loosening of the canopy due to dying and fall of some of the large oaks is a condition crucial for the development of level 3. e increasing EIV for the light and moisture of the herb layer ... number of recorded species may, however, also mean the movement of some of the ecologi- cal factors. In the case of floodplain forests, one of the most important factors is...

Ngày tải lên: 07/08/2014, 03:22