By Jürgen Bender
In dependence on the lecture in the seminar "Restoration Technologies of the Alfred Toepfer Academy for Nature Conservation" in Schneverdingen.
While the nature conservation legislation aims at conserving the natural diversity of plants by means of the German Federal Law for Nature Conservation, the German seed trading act is not in accord with this principle. Every year, some thousand hectares of landscape areas are restored within the compensation of interferences through construction in Germany. To avoid a genetical unification of our phythocenoses caused by applying standardized types of seeds from the North Sea to the Alps, establishing vegetation suitable to site and with regional, indigenous seeds must be promoted urgently.
It is not only consulting engineers and architects, but also responsible hydroseeding and erosion control professionals, who are to attend to the duty of using regional seeds. Which of the revegetation methods is applied, depends on the size and quality of the available donor areas as well as the site conditions of the area to be restored.
For example, a lot depends on the soil organic matter content (topsoil / raw soil), the thickness of the potential rootzone, the soil type, chemical and hydrological values, etc. Climatical and also geological preconditions play a less important role, as with procedures close to nature, reclamation areas and areas to be revegetated are within the same geographic region. However, micro-climatic parameters like altitude or lighting conditions must be considered. If a reliable erosion control is necessary, parameters like slope length, inclination, soil cohesion, wind strength, etc. are to be regarded.