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Stuttgart, Germany

Schildbach M.,Staatsbetrieb Sachsenforst
Landbauforschung Volkenrode | Year: 2014

The resistance to abiotic factors is a key criterion for the selection of poplar clones for cultivation in short-rotation plantations. Within the framework of the joint project "Fast-WOOD" the public enterprise "Sachsenforst" examines existing and newly bred clones and progeny of the genus poplar on their tolerance to frost and drought. The studies on drought resistance include the classification of drought damage at sample plots, dehydration experiments in the greenhouse and the determination of hydraulic conductivity in the laboratory. The response to drought is specific to clones and also highly dependent on the time of occurrence. Lack of water after planting and in late spring causes the greatest damage. The frost resistance is determined by assessment of sprouting and shoot growth cessation phase. Additional frost test are used to determine the extent of damage. Both in the early and in the late frost risk, there are big differences between the clones. Source

Forestry introduced tree species in Saxony have a share of 5.8%, including European larch from the Sudety Mountains and red oak from north America as the area most important species. The predominant base of their enhanced cultivation is the loss of forest functions through damaged spruce forests by immissions, so happend at the early 20th century in the field of the industrial centers Chemnitz and Freiberg and towards the end of the century on the ridges of the Saxon mountain ranges. A long-term improvement of forest condition as a requirement of durable forest functions and operational successes not often resulted. Visible positive experiences are limited to stocks of red oak, larch, Balkan pine and a number of small-scale occurrence of spruce and fir trees. The reasons of failures are varied and complex. They begin with the unfavorable locational initial conditions and include lack of site suitability as well as false origin choice. Added to this are the interactions with the native biological communities and evolutionary processes, especially with phytophagous insects and pathogens. In the forest management plan of the country forest only the black cherry noticeable signs of spontaneous spreading, mostly in pine, oak and birch stands. From the point of changing environmental conditions the assessment of introduced tree species is to be understood as a dynamic process - more so than with the native tree species. Apart from enrichment plans or control programs, past experiences leads us to a largely inclusive silvicultural handling, which is differentiated by tree species and sites. © DLV GmbH. Source

The working group of forest interpreters of aerial photographs (AFL) is an association of mainly forest specialists of remote sensing, working for forest administrations, research centres and institutes, universities as well as for private enterprises in German-speaking countries. The article gives a summarizing overview of the interpretation-keys of aerial photographs developed by AFL as well as a preview of the guide for "requirements of the digital / digitized aerial photography". The development of the guide is the still in progress. © 2010 E. Schweizerbart'sche Verlagsbuchhandlung, Stuttgart, Germany. Source

Trober U.,Staatsbetrieb Sachsenforst | Ballian D.,University of Sarajevo
European Journal of Forest Research | Year: 2011

The genetic structures of six populations of English yew (Taxus baccata L.) from different parts of Bosnia and Herzegovina have been characterized by means of isozyme analyses. Using six polymorphic gene loci, a total of 16 alleles have been found with a number of nine alleles, which were in common in all populations. In general, the values of observed heterozygosity reflect a very high level of individual genetic variation. Great differences in the relative allele frequencies lead to relatively high gene pool distances between the populations. Whereas the genetic structures of four populations corresponded essentially with the results of publicized investigations of yew populations from other parts of Europe, two occurrences show great differences. The possible reasons of these peculiarities are discussed. Based on the results of the genetic analyses, different measures for the maintenance and development of the genetic resources are recommended. The conservation management on the population level can prevent the possible loss of genetic adaptation as far as the reasons of genetic differences and their importance are not discovered to a sufficient extent. © 2010 Springer-Verlag. Source

In Saxony, black poplar as an essential natural compartment of alluvial forests is a highly endangered species.Therefore, identification and documentation of black poplar occurrences along the major rivers in Saxony have been carried out since 2005. The collected data are the basis for the identification of species and characterization of stands, seedling progenies and single occurrences by means of genetic analysis. Generative or vegetative propagation of suitable individuals and stands are utilized by Sachsenforst, to provide reproductive material of high quality for the realization of measures for the conservation and promotion of the genetic resources of black poplar. For the river Elbe, first results on genetic structures exist for five populations and two seedling offsprings. The establishment of a clone archive, where vegetative reproductive material for the reintroduction of black poplar can be harvested in future, has been started. Already now, seedlings from two populations are available and plants from an additional stand grow up in the nursery. This is a part of prerequisites for the promotion of black poplar. To make the reintroduction of this species successfully, an open and constructive cooperation among nature protection organizations, state and district institutions as well as land owners is of decisive importance. © DLV GmbH. Source

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