Báo cáo lâm nghiệp: "Sexual reproduction in Populus I Some physiological and biochemical events of the progamic phase" pdf

... (1983) Callose and determination of pistil viability and incompatibili- ty. Theor. AppL Genet. 67, 1-10 0 Gaget M. (1988) incompatibility intersp6cifique chez Populus: effet ... pollinic enzymes involved in pollen tube metabo- lism, such as ¡3-galactosidase. Its activity could be the final result of a series of inter- actions started by initial...

Ngày tải lên: 09/08/2014, 04:20

... implicated in interspecific incom- patibility of self-compatible species. Cellular localization and biochemical identification of pollinic molecules, likely to be implicated in interspecific ... M.M. (1976) A rapid and sensitive method for the quantitation of microgram quan- tities of protein utilizing the principle of protein dye binding. An...

Ngày tải lên: 09/08/2014, 04:20

... of Bedigliora and 86% for Brione) of all the ring shakes observed in green wood, while in the dried wood this proportion slightly diminishes to 84% (81% for Bedigliora and 86% for Brione). The other ... develop during the drying-process, confirming previous observations performed by Fonti et al. [6]. 3.3. Shake distribution The analysis of the ring shake distribution...

Ngày tải lên: 08/08/2014, 01:21

... little information is available concerning the ability of field-fertilized seedlings to avoid drought immediately following planting. This experiment was designed to examine the influence of ini- tial root ... also possible that the inherent variation in studying root proliferation relative to fertilizer placement in the field (i. e., precision of planting hole size, fertili...

Ngày tải lên: 08/08/2014, 01:22

... times). Significant differences were confirmed again, primarily in those variants of the pot experi- ment in which we compared yellowing spruce seed- lings planted in the soil with intensive impact ... Manganese is an essential element, it is however toxic in higher concentrations. Its mobilisation in- dicates disturbances of physiological equilibrium reflected in the c...

Ngày tải lên: 07/08/2014, 03:22

... that the total rise in temperature in the immediate vicinity of the Carpathians and Tatras in the course of the current warming process is typical of Central Europe. Between 1881 and 1990 the ... change in species composition in low mountain beech for- ests in the Bieszczady Mountains and to compare the current species composition with the species...

Ngày tải lên: 07/08/2014, 03:22

... “chemical thinning”. Relative to the conventional mechanical thinning, this technique is far less time and resource demanding (K 1968). In the past, arboricides were applied by paint- ing ... according to the needle year-class (%) Defoliation to the needle year-class (%) Sum of defoliation (%) Affected trees (%) Dead trees (%) I II I+ II+III Σ I I+II I+ II+III...

Ngày tải lên: 07/08/2014, 03:22

... determining the effect of a driving unit on soil are density of soil in the rut and its depth, which depend on the number of passages in the same track. Investigations included measuring the depth of ... without us- ing engineering structures and drainage and have rather large longitudinal inclines, which in most cases does not allow using them for the pass...

Ngày tải lên: 07/08/2014, 03:22

... plantation forest model by much of the public, particularly in more developed regions. is is increasing the interest in multiaged silviculture in North America as in other regions of the world. ... species and where wind is the dominant disturbance regime. In the southeast, mixtures or pure stands of southern pines (Pinus taeda, P. echinata, P. palustris) can...

Ngày tải lên: 07/08/2014, 04:20

... Ni- trogen mineralization, immobilization and loss, and their role in determining diff erences in net nitrogen production during waterlogged and aerobic incubation of soils. Soil Biology and ... subtraction of the initial content of available mineral N (for the anaerobic incubation of NH 4 + -N content); N initial ‒ initial content of available mineral N (for th...

Ngày tải lên: 07/08/2014, 10:21