Báo cáo khoa học: "Rejuvenation of Quercus robur" ppsx

... greenhouse due to a lack of space; for the 65-year olds, 3 sections out of each of the total number of sections present in each fourth por- tion of the stem height were ... consequences of matu- ration. Maturation is often associated with the loss of rootability and with the success of promotion of flowering (Libby, 1974). The resul...

Ngày tải lên: 08/08/2014, 19:21

... the juvenility degree of its apical meristems, appears to be a good model for the study of phase change phenomena of forest trees. In this way, most of the investigation ... with Krenke’s (1940) conception of maturation, although this juvenile state remains invisible most of the time, probably as a consequence of the inhibitory correlative...

Ngày tải lên: 09/08/2014, 02:21

... of introgression between Quercus robur and Q petraea in The Netherlands. Acta Bot Neerl 38, 313-325 Jovanovic M, Tucovic A (1975) Genetics of com- mon and sessile oak (Quercus ... (1960) Evolving new forms of oak by hybridization. Proceedings of the 5th World Forestry Congress 2, 815-817 Rushton BS (1978) Quercus robur L and Quercus petraea...

Ngày tải lên: 08/08/2014, 19:21

... 15/20 provenances of presumably Danish origin, 4 of Dutch origin and 1 of German origin. All of them are Quercus robur, except F232 which is a Quercus petraea of German origin. ... but signifi- cant effect of provenance at 18 years of age; however, the effect of block variation (site condition) was very high. At the age of 25 yea...

Ngày tải lên: 08/08/2014, 19:21

... results of the preliminary stage of a provenance experiment, using the 1984 acorn crop. The acorns were harvested in pure seed stands of Quercus robur and of Q pe- traea ... The majority of stands consist of Q robur, but there are also stands composed of both species, perhaps including hybrids. A morphological and genetic analysis of...

Ngày tải lên: 08/08/2014, 19:21

... number of reports of the low pathogenicity of Ophiostoma species on adults trees in situ in Europe (Balder, 1992) reinforces the hypothesis of the absence of implication of ... to artefacts in the estimate of loss of conductivity with Sperry’s resatura- tion technique. The decrease of the leaf- specific conductivity of petioles with incr...

Ngày tải lên: 08/08/2014, 19:21

... consisted of the standard dolomite application (F1) plus an addition of 0 to 800 kg ha –1 of natural phosphate as well as between 200 and 250 kg ha –1 of potassium sul - phate. The amount of natural ... CaMg(CO 3 ) 2 (55% Ca CO 3 and 40% Mg CO 3 ) of particle size < 100 µm; 2 : 31% of P 2 O 5 in powder; 3 : 50% of K 2 O in powder; 4 : because of an error during fieldwork....

Ngày tải lên: 08/08/2014, 14:21

... densities, in spite of the mortality or of the development into shoot of the different kinds of buds, the composition of the epicormic potential was Epicormic potential in Quercus petraea 589 Figure ... remnant of the initial budor on the short remaining portion of the dead shoot. The emergence of secondary buds characterized a visible pro- liferation of the number of bu...

Ngày tải lên: 08/08/2014, 14:21

... emergence of the seedlings from the fresh seed of tree No. 10 was sig- nificantly different (P < 0.05) from that of trees No. 7, 9, 3and6(table II). Most of the seedlings (83.3%) from fresh seed of ... depended on the duration of seed storage. The seed size and the duration of storage had a great effecton the initial rate of leaf production, but did not affect the final num...

Ngày tải lên: 08/08/2014, 14:21

... sec- ond year, the effect of infection on gas-exchange was not detected in spite of the progress of the disease in inocu- lated plants (figure 1), that lead to the mortality of 10% of the plants in spring ... (figures 3e,f and figures 4e,f). In spite of this, we did observe that one of the components of ∆F/F' m , F' v /F' m (which rep- resents efficiency of op...

Ngày tải lên: 08/08/2014, 14:21