Vyzkumny ustav lesniho
Vyzkumny ustav lesniho
Kunes I.,Czech University of Life Sciences |
Balas M.,Czech University of Life Sciences |
Spulak O.,Vyzkumny ustav lesniho |
Kacalek D.,Vyzkumny ustav lesniho |
And 3 more authors.
Zpravy Lesnickeho Vyzkumu | Year: 2011
The paper evaluates the nutritional status of young Norway spruce stands on five forest sites that were chosen for introduction of admixture consisting of broadleaves and silver fir. Since no broadleaves and firs were present in the pure spruce stands to be diversified, Norway spruce was used as an indicator of nutritional potential (trophy) of forest sites. e concentrations of nitrogen (N), phosphorus (P), potassium (K), magnesium (Mg), calcium (Ca) and sulphur (S) were determined in the dry mass of spruce needles. The achieved macroelement concentrations were confronted with the nutritional criteria used for evaluating the nutrition of spruce to elicit the information on nutritional status of spruce on the forest sites. Authors suggest that this information could be generalized and the potential of the forest sites to supply also another native species (including broadleaves and silver fir) with nutrients could be derived from nutritional status of spruce. The obtained results suggest that the nutrition of young Norway spruce is sufficient on all five forest sites at present time; nonetheless, the uptake of nutrients from soil will probably rise to considerably higher levels than now whilst the young forest will form its crown and foliage biomass. Phosphorus and potassium seem to be the most limiting components in tree nutrition during the future development of young forest stand on the evaluated sites. erefore, the initial fertilization of the broadleaves and silver fir introduced to the coniferous stands with slow-release PK fertilizers was recommended. To help the young plantations of broadleaves and silver fir to surmount the post-planting shock, the addition of slow-release N is also desirable in the amendment intended for the initial fertilization.
Mala J.,Vyzkumny ustav lesniho |
Machova P.,Vyzkumny ustav lesniho |
Cvrckova H.,Vyzkumny ustav lesniho |
Konnert M.,Bavarian Office for Forest Seeding and Planting ASP
Zpravy Lesnickeho Vyzkumu | Year: 2013
A certain proof of origin is important for tracing back forest reproductive material. The Czech Republic as a member state of the European Union and on the base of international legislation (Council Directive 1999/105/EC on the marketing of forest reproductive material on the market) has the obligation to create a functioning control system for determination of forest reproductive material. Its aim is to ensure clear identification of reproductive material from the acquisition to delivery to the consumer. The existing legal regulations on forest reproductive material in the Czech Republic provide only the inspection of the master certificates and delivery papers as a control measure. At present, the insufficiency of the current control system consists in the impossibility to prove any infringement of precepts by an objective method that would allow verification of the real origin of a selected sample of forest reproductive material. Objective methods for independent verification of origin of the plant material based on molecular methods, however, are already used, including the first attempts of their utilizing in practice. A certification system called ZüF ("Zertifizierungsring für überprüfbare Forstliche Herkunft Süddeutschland e.V.") was operationally established in Germany in 2002.