Báo cáo lâm nghiệp: "experiment on the effect of girdling and gibberellin application on flowering induction of 12 yr old seedlings of Douglas fir and Norway spruce" pptx

... experiment on the effect of girdling and gibberellin application on flowering induction of 12 yr old seedlings of Douglas fir and Norway spruce M. Bonnet-Masimbert with the technical ... . References Bonnet-Masimbert M. (1987) Preliminary results on gibberellin induction of flowering of seedlings and cuttings of Norway...

Ngày tải lên: 09/08/2014, 04:20

... result of CCB application were observed in the content of organic matters and total nitrogen, degree of base cation saturation, content of phospho- rus and potassium. On the contrary, cation exchange ... L. in the treatment with the application of CCB Fig. 5. Tilia cordata Mill. and Pinus nigra Arn. in the treatment with the application of CCB Fig. 6....

Ngày tải lên: 07/08/2014, 10:21

... correlations were evaluated. Except for the correlations mentioned in Discussion any other relationships cannot be proved. One of the reason is that the investigation period 2004–2006 is rather ... periods, the roots and mycorrhizae were sampled and evaluated according to the same standard method (P, S 2006). Assessment of defoliation In the study plots,...

Ngày tải lên: 07/08/2014, 03:22

... 1999) and also in the other types of low altitude forests (e.g. Z 1973). In all of them Cg is one of the dominant species. In our study we concentrated on the study of the population of this ... 2005–2006. The only effective prevention against damage seems to be the reliable prediction of population densities by pest species monitoring and early plan- ta...

Ngày tải lên: 07/08/2014, 03:22

... population abundance is based on the combination of functional and numerical response of all occurring species of predators (K 1985). Nevertheless, under con- ditions with the diverse and stable ... evaluated on ten plots each of 0.5 m 2 and the average amount of mast was deter- mined. e plots were selected randomly in the oak stand and the number of...

Ngày tải lên: 07/08/2014, 03:22

... Protection, 48: 956–965. (in Polish) Š M. (2006): Distribution of tribes of cockchafers of the genus Melolontha in forests of the Czech Republic and the dependence of their swarming on temperature. ... abun- dance of populations of cockchafers of the genus Melolontha caught in light traps and we discov- ered that in general the population densities of...

Ngày tải lên: 07/08/2014, 10:21

... by the poor quality of leaves and the increasing accumulation of tannin as reported by F (1970) and also F et al. (2004). Because of a lack of information about the quality of food ... the year of study along A1 and host specificity along A2 were important in the summer feeder guild; and adaptation to lower quality of food along A1 and host specifi...

Ngày tải lên: 07/08/2014, 10:21

... equations. During the period of inves- tigation (age of 12 21 years) the total biomass of investigated stand increased from 6.1 to 56.2 thou- sand kg of dry matter per hectare on the control ... 5 kg of P, 22 kg of K, 26 kg of Ca and 4 kg of Mg. The removal of biomass in areas previously degraded by acid deposition may result in the deficiency of Ca and...

Ngày tải lên: 07/08/2014, 10:21

... polymorphic bands in all the trees evaluated. On the other hand, the understanding of the genetic diversity presents in a species and the distribution of this variation among populations is important ... (upper), zone D (medium) and zone E (lower) A B 14 kDa 20 kDa 20 kDa 30 kDa 30 kDa 45 kDa 45 kDa 30 kDa 30 kDa 20 kDa 20 kDa 14 kDa Zone E Zone D Zone D Zone A Zone B Z...

Ngày tải lên: 07/08/2014, 10:22

... exceeded the circumference of the crown.  is au- thor reported that the width of spruce root systems in the Hronec locality was wider by 94 cm than the width of the crown. On the other hand, K ... years; and that the root systems of trees at the age of 80 years were the same as those 120 years old. According to our results, the correlation bet...

Ngày tải lên: 07/08/2014, 10:22