Landscapes Forest and Global Change - ESA - Escola Superior ...

G. Zhelezov 2010. Evaluation of the ecosystem service in the forest formations of Biosphere Reserve “Srebarna”
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t/ha in the periphery, where density of this species is not high. The island territory saved
and protected the classical Danubian formation with low anthropogenic impact and can
be use as etalon territory.
The fourth research area is situated in east part of the reserve along the slope of hill
Kara Burun (111 m). The forest formations are presented with mixed forest formations
diminated from Quercus cerris, Quercus pubescens, Quercus virgiliana and mixed forest
formations diminated from Quercus frainetto and Carpinus orientalis. The low quantity of tree
phytomass (67,8 t/ha) is depended from low density of the formations and high
anthropogenic impact.
The ecosystem service of forest formations in the Biosphere Reserve „Srebarna” can
observe in several aspects:
- supporting - primary production, nesting conditions;
- provisioning – food, wood, and other good;
- regulatory – water quality and water regime, regulation of erosion processes;
- cultural – aestetic, recreational and touristical.
Conclusions
The basic problem in the ecological situation of Srebarna wetland system is intensive
degradation of the systems as a result of long-time anthropogenic impact in the region –
building of river dikes and irrigation system.
The eutrophication processes are connected with productivity of the vegetation formations.
Regulation of the productivity of the hydrophite formations in the lake is basic aim of the
present nature protected activities and management plans of the wetland systems.
Forest formations from the point of view of ecosystem services have important role in the
protection of the wetland system from slope erosion in south, east and especially west part of
the wetland system. Some forest formation (Salix cinerea) combined with hydrophite
formations are key factor for degradation of the lake (closing of water body, increasing of
bottom substrate etc). Mixed forest formation of Salix alba and Populus alba are important
habitat for the nesting colonies of waterfowl birds, especially cormorant and heron species.
Development of monitoring system for hydrophite formations and water regime is basic
problem connected with future investigations and management of the wetlands system.
Acknowledgement
This work is supported by the European Social Fund and Bulgarian Ministry of Education,
Youth and Science under Operative Program “Human Resources Development”, Grant
BG051PO001-3.3.04/40.
References
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Management plan of reserve Srebarna, 2001.
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