State of the Environment Bulgaria 2003
Information from the monitoring of the forest ecosystems for the conditionally perceived regions in 2001
Status of the forest soils by region
Region – West Stara Planina;
The soils are not polluted with heavy metals. There is no data on the impact of nitrogen precipitation from the atmosphere and changes in the nitrogen circuit.
2.Region – Middle Stara Planina – North slope;
The soils are relatively well preserved with organic substances. The carbon content is between 20-40 g/kg and it is higher only in the region of Botevgrad - 70 g/kg. The nitrogen content varies between poor and average. The soil solution is from average acid up to acid (ph 5- 5,5).
The content of heavy metals (Cu, Zn, Pb, Cd) in dependence with the soil reaction is below the admissible norms with the exemption of the region of Blagoevgrad.
4À.Region – South slopes of Stara Planina and Sredna Gora
The surface soil horizons are richer with nitrogen. In general the soils are well provided with nutrition elements.
The content of the heavy metals is as follows: Cu and Pb exceed the admissible norms in the surface soil horizons for Klisura, the content of Zn is decreased for PP 0173 and is increased for Sahrene and Kazanlak.
The soil cover has a richer content of Ê, Ñà, Na at the sites with beech and winter oak.
The accumulation of Cu and Pb is high as well as the accumulation of Cd for the region of Klisura. The content of Pb is high also in a sample site Elin Pelin, which is imposed in the Kremikovtsi impact. The content of Zn is high in the region of Kazanlak. In general the soil coverage plays a particular role as filter for the ecosystems regarding the heavy metals (Cu, Zn and Pb).
4B region – South slopes of Sredna Stara Planina, Sredna Gora, Vitosha (east and north slopes), Lozenska, Plana and Rila (north and south slopes) mountains
The soils of the surveyed sample sites were not polluted with heavy metals and there are no signs of increased precipitation of components containing nitrogen from the atmosphere.
6 region – Mountains in South – West Bulgaria
The surveyed sample sites are within the area of the brown and cinnamon forests soils. The content of Cu and Zn is below the MPC. The Pb content is slightly increased for the region of Melnik, Garmen and Leeve (Jakoruda). In general there is no pollution above the MPC in South–West Bulgaria.
During the surveyed period the soil coverage as a whole did not show significant concentrations of heavy metals that would endanger the functioning of the ecosystems.
7 Region – West Rhodopi
The soils of the surveyed sample sites are not polluted with heavy metals and there are no signs of increased precipitation of components containing nitrogen. The soils, with the exemption of those from Jundola have high buffer capacity.
Last update on March 2003