Field margins and their meaning for species richnes and biological control
Fachgesprach Biologische Vielfalt in Der Agrarlandschaft
The agricultural landscape in Germany is structured by a variety of linear and point-like landscape elements such as hedgerows, field margins, edges of woods, copses, etc.. Hedges and field margins are forming the landscape and because of the naturalness it has an important function for the species biodiversity. It offers especially for the highly specialized predators additional food resources and wintering habitats and retreats. In 1993 we started the project Brandenburg stacked-wood hedge to demonstrate an ecological and economical way for the new establishment of hedges and field margins. The long-term monitoring of the hedge shows the development and the importance as a habitat for plants and animals. Within 10 years the number of trees increased about 30 % from 354 to 460. The number of tree species is now 5 times higher, a growth from 12 to 55 tree species.The attraction of the blossomy herb strip was shown by the flower-visiting hover-flies. To 100 m depth of the field, the higher population of beneficial insects had a positive effect reducing aphids. Bird monitoring in the hedge showed, that already in 1994 the red-backed shrike (Lanius collurio) used it as a breeding ground. Ten years after building the hedge, the bird density reached a value of 2.3 breeding bird territories per 100 meters. The example shows, that into a short time through a combination of hedges and flowering field margins a valuable, structurally rich landscape element can be build in an arable area. Beside the functional biodiversity by beneficial insects, it is also a preservation of biodiversity in general.
Author(s): Kuhne, S; Freier, B
Journal: Fachgesprach Biologische Vielfalt in Der Agrarlandschaft