Beech （Fagus orientalis Lipsky） forest covers about 565,000 ha of land in Guilan province, north of Iran and forms a major carbon pool. It is an important economic, soil protection and recreation resource. We studie...Beech （Fagus orientalis Lipsky） forest covers about 565,000 ha of land in Guilan province, north of Iran and forms a major carbon pool. It is an important economic, soil protection and recreation resource. We studied long-term effects of fire on the structure and composition 37 years after fire occurrence in these forests. To do this research, we selected 85 ha burned and 85 ha unburned beech forests）. The results indicated that the fire had not changed the overall uneven-aged structure, but it changed forest composition from pure stands to mixed stands that now include species such as Carpinus betulus, Acer cappadocicum and Alnus subcordata. The density of trees and regeneration was significantly increased, while the density of shrubs significantly decreased. The main reasons for increased tree regeneration were attributed to （1） reduction of litter depth, and （2） increase in available light from opening of the canopy and reduction in shrub competition. It is apparent that the forest is on a path to return to its natural state before the fire after 37 years.展开更多
The vascular flora of the Siahrud-e Rudbar protected area was investigated in the years 2007 and 2008. It is a sylvatic area in the Guilan province with a total area of approximately 28 289 hectares. A total of 711 pl...The vascular flora of the Siahrud-e Rudbar protected area was investigated in the years 2007 and 2008. It is a sylvatic area in the Guilan province with a total area of approximately 28 289 hectares. A total of 711 plant specimens were collected and 616 species,subspecies,and varieties,belonging to 373 genera and 101 families were identified. Of these,14 species( 2. 3%) are endemic to Iran. The documented flora exhibited many typically Hyrcanian species,including Hyrcanian endemics. The global phytogeographical affinities of the species were as follows:Euro-Siberian 21. 2%,Iran-Turanian & Euro-Siberian 16. 8%,Pluriregional 11. 7%,Iran-Turanian 10. 6%,and Cosmopolite 5. 5%.展开更多
文摘Beech （Fagus orientalis Lipsky） forest covers about 565,000 ha of land in Guilan province, north of Iran and forms a major carbon pool. It is an important economic, soil protection and recreation resource. We studied long-term effects of fire on the structure and composition 37 years after fire occurrence in these forests. To do this research, we selected 85 ha burned and 85 ha unburned beech forests）. The results indicated that the fire had not changed the overall uneven-aged structure, but it changed forest composition from pure stands to mixed stands that now include species such as Carpinus betulus, Acer cappadocicum and Alnus subcordata. The density of trees and regeneration was significantly increased, while the density of shrubs significantly decreased. The main reasons for increased tree regeneration were attributed to （1） reduction of litter depth, and （2） increase in available light from opening of the canopy and reduction in shrub competition. It is apparent that the forest is on a path to return to its natural state before the fire after 37 years.
文摘The vascular flora of the Siahrud-e Rudbar protected area was investigated in the years 2007 and 2008. It is a sylvatic area in the Guilan province with a total area of approximately 28 289 hectares. A total of 711 plant specimens were collected and 616 species,subspecies,and varieties,belonging to 373 genera and 101 families were identified. Of these,14 species( 2. 3%) are endemic to Iran. The documented flora exhibited many typically Hyrcanian species,including Hyrcanian endemics. The global phytogeographical affinities of the species were as follows:Euro-Siberian 21. 2%,Iran-Turanian & Euro-Siberian 16. 8%,Pluriregional 11. 7%,Iran-Turanian 10. 6%,and Cosmopolite 5. 5%.
