Báo cáo lâm nghiệp: "Frost damage on the terminal shoot as a risk factor of fork incidence on common beech (Fagus sylvatica L )" docx

... which was much sig- nificant than the other variables and factors available. Thus overall, the damage factor had both a statistical and a causal value, i.e. functional and more precisely morpho- genetic. ... A risk of fork emergence was calculated for each of the damage levels. The relative risk of fork emergence, with its confidence limit (at 5% of risk le...

Ngày tải lên: 07/08/2014, 16:20

... microbienne. Les hémicelluloses caracté- risées par leur abondance en xylose y sont plus massivement représentées que la cellulose. Suite à l altération et à la fragmentation des litières, la phase des ... dépolymérisation de la lignine par la rupture préférentielle de la liaison éther éta- blie entre O-phénoliques et le carbone de la chaîne propane. Il s’ensuit une dégradation oxydative de...

Ngày tải lên: 08/08/2014, 01:22

... prob- ably caused by accelerated growth rates and growth dilution. Soil acidification and ion leakage associated with the ammo- nium sulphate fertilization further decreased their availability. • The ... Kluwer Academic Publishers, Dordrecht, The Netherlands, 2001. [9] Burke M.K., Raynal D.J., Mitchell M.J., Soil nitrogen availability influences seasonal carbon allocation patterns in su...

Ngày tải lên: 08/08/2014, 01:21

... locations of Zaragoza province (Q. coccif- era at Ejea de los Caballeros, Q. faginea at Daroca and Q. ilex at Paniza, Aladrén and Alfamén, these last three locations in a few kilometres range) ... et al. [20]. As a basal leakage value it was employed a mean value (n = 15 per species) of undamaged samples of each species with the same characteristics as the ones used in th...

Ngày tải lên: 08/08/2014, 01:22

... plantation on the damage of plants showed a sta- tistically significant difference between losses in full-area prepared areas and ploughed areas, in fa- vour of full-area preparation where 0 to 20% of ... developmental cy- cle the first moulting takes place as soon as in the year of hatching and already in the advanced sec- ond stage the larvae winter. In the 4-y...

Ngày tải lên: 07/08/2014, 03:22

... it on experimental plots and relating it to the area of 1 ha. Qualitatively, undergrowth on a cutting area was divided into the following catego- ries: undamaged, weakly or greatly damaged and ... of harvesting operations on the soil surface of cutting area was assessed complexly by investigation of the degree of damage to soil dur- ing harvesting operations and...

Ngày tải lên: 07/08/2014, 03:22

... Since avail- ability and nutritional quality are seasonally variable, the importance of alternative food resources changes between seasons (M at al. 2006). In recent years distinct opinions ... of the Bohemian and Moravian Upland. Ave- rage annual temperature is 6°C, the area is situated at an elevation of 600–730 m above sea level. e main part of the shooting ground...

Ngày tải lên: 07/08/2014, 04:20

... available N in soil is an important ecological factor.  e aim of our study, apart from the assessment of available soil N in the surface mineral layer of various types of forest soils, was ... content). Table 1. Soils utilized in the experiment and their textural composition Soil type (by FAO soil classifi cation) Location, average annual temperature, average annual rai...

Ngày tải lên: 07/08/2014, 10:21

... molecular, physiological and morphological characteristics that can help to detect the presence of F. angustifolia at the population level, either in seed and/or seedling samples, or in adult ash ... could signal other types of admixed or hybrid populations, since hybrid segregation usually produces a mo- saic of morphological and molecular markers that can vary among hybrid zones...

Ngày tải lên: 07/08/2014, 16:20

... commonly used in forestry is the basal area increment (BAI) instead of the ring width. The basal area is defined as the area of the cross-section of a tree stem near the base, generally measured ... than the longer series. The growth rate of the short series also decreases rapidly after ca. 20 years whereas the growth rate of the longer series only displays...

Ngày tải lên: 08/08/2014, 00:22