بررسي و مقايسه ي رويش و توليد چوب در واحد سطح توسكاي قشلاقي در غرب گيلان

The investigation and compartive of growth and wood production Alfius glutiriosa Gaertn , subsp . barhata in west of Guilan province(North of Iran)

The black alder (Alnus glutinosa ( L ) geartn . subsp . barbata) is one of the important and rapid growth species as a pioneer in wetland areas. It has power to fixing soil Nitrogen with over biomass production in the wood cultivation and various application in short rotation industry . Alnus genus is located from 25 southern to 70 northern altitude in Europe anti] 2800 height from the sea level in cold Meditraneh climate (mainly in wet floodplain Hidromoroph and wet soil). This project was performed in Gisum areas between 49° 8ʹ and 49° 5ʹ length geographic and 37° 23ʹ and 37° 30ʹ width geographic which has been located in Talcsh city . This project were randomly conducted in four blocks (seeding method, coppice method seeding and coppice method and plantation ) and three replication of 18 years Alnus of forest. The results show That treatments had not meaningful difference in volume production, basal area of stand 1.30 cm and the number of trees with each other. We can perform each of these four ways for black alder for producing wood in flooe plain lands . This kind with an average 997.6 tree in hectar , diameter average 18.9 , height average 17.3 cm , average basal area of stand 24.7 in hectar volume growth auerage 12.9 Silve in hectar in a year was studied .