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Muhlenberg M.,Center for Nature Conservation | Appelfelder J.,Stiftung NaturSchutzFonds Brandenburg | Hoffmann H.,German Technical Cooperation | Ayush E.,Center for Nature Conservation | Wilson K.J.,Charleston
Journal of Forest Science | Year: 2012

Studies were undertaken to investigate the composition, structure and diversity of four different types of North Mongolian montane forest near the southern border of the taiga. These forest types, classified as willow-poplar, larch-birch, spruce-fir and Siberian-pine forests, were found to be significantly different with respect to the elevational gradient. In the study area, two fire regimes could be distinguished at lower and drier elevations, frequent surface fires resulted in less diverse forests comprising coniferous species, which in their adult form were found to be fire-resistant, burn-colonizing and light-demanding deciduous tree species. In contrast, the forests colonizing the moist, higher elevations and shaded slopes had a higher diversity of tree species with greater basal area, higher proportion of deadwood, and more regenerating trees; here the coniferous shade trees experienced infrequent but destructive treetop fires. Overall, our results showed that the four forest types differed in composition according to the tree species, diameter and height classes.

Zauft M.,Stiftung Naturschutzfonds Brandenburg | Zeitz J.,Humboldt University of Berlin
Telma | Year: 2011

Dissolved organic carbon (DOC) is the largest discharge component in the carbon balance of peat bogs with the exception of carbon dioxide (CO 2) and methane (CH 4). Very little attention has been devoted to the behaviour of DOC after peat bogs have been rewetted. It is already known that DOC discharges from degraded peat bogs can rise when the water level is raised. The size of this discharge and the influencing factors are however still little understood. To measure and determine the influencing factors, this case study looks at three rewetted peat bogs which differ in terms of hydrogenetic peat bog type, the intensity of the former use, and the level of anthropogenic pedogenesis. The results show that the main influence on the DOC discharge is associated with the hydrology and genesis of the peat bogs. High DOC discharge levels in receiving water courses after rewetting can mainly be expected from peat bogs affected by strong degradation, flushing or percolation.

Zauft M.,Stiftung Naturschutzfonds Brandenburg | Ruffer J.,Stiftung Naturschutzfonds Brandenburg | Rossling H.,Stiftung Naturschutzfonds Brandenburg
Telma | Year: 2012

The "NaturSchutzFonds Brandenburg" Foundation is currently involved in a five year LIFE-Nature project running from 2010 to the beginning of 2015 aimed at renaturising calcareous fens in Brandenburg. Although still common in Brandenburg a century ago, these habitats are on the verge of disappearing and can only be saved by undertaking complex renaturisation measures. The most fundamental aspect is raising the water levels in the peatlands, and stabilising the water levels in the summer in particular. As part of the EU-LI FE-Nature project, a number of measures were already implemented in various project areas in the first 3 years. In addition to measures to re-establish a natural water regime on drained peatland -primarily by filling in ditches and removing the uppermost layers of degraded soil - the work also involved thinning out the clumps of reeds and sedge, and removing trees and shrubs. The replanting of the mosses and vascular plants typical of calcareous fens is planned from autumn 2012 onwards for the less nutrientrich areas where the upper layers of degraded soil have been removed. In some of the project areas, local farmers were assisted in establishing habitat-compatible fanning methods to enable the implementation of any long term management which may be required in the nutrientpoor fens in particular. By summer 2012, over 120 ha of eutrophic reed and sedge beds were mown using a special technique. In addition, trees were removed from approx. 14 ha by testing a range of different methods, to create better conditions for the plant communities typical of calcareous fens and sub-neutral intermediate fens. The water levels are only raised after implementing these preparatory methods. Concrete rewetting measures - mainly by deactivating drainage ditches - have been carried out at five of the 14 project areas so far affecting an area of approx. 100 ha.

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