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This study was carried out to determine radial variation of wood density, modulus of elasticity (MOE), modulus of rupture (MOR) and stress at elastic limit in plantation and natural alder (Alnus glutinosa) forests in north of Iran. Testing samples were taken at breast height of the stem and at three radial positions (10, 50 and 90 % of radius) for both cultivation methods (natural and plantation forests) to determine wood mechanical strength properties according to the ASTM standard. Analysis of variance indicated that cultivation methods (natural and plantation forest), radial position and interaction between planting position and radial direction had no significant effects on the modulus of elasticity (MOE), modulus of rupture (MOR) and stress at elastic limit in alder wood. Only the radial position had a significant effect on the wood density. Wood density was increased along radial direction from the pith to the periphery for both planting conditions. Overall, the mechanical strength properties in plantation forest were slightly higher than in natural forest. The relationship between wood density and mechanical properties were analyzed by linear regression. A positive relationship was found between wood density and mechanical properties for both planting conditions. These relationships were stronger in plantation forest than in natural forest.Istraživanje je provedeno kako bi se u radijalnome smjeru utvrdile varijacije gustoće drva, modula elastičnosti (MOE), modula loma pri savijanju (MOR) i naprezanja na granici elastičnosti drva crne johe (Alnus glutinosa) iz plantažne i prirodne šume johe sa sjevera Irana. Ispitni uzorci uzeti su na prsnoj visini stabala s tri radijalne pozicije (10, 50 i 90 % radijusa) iz oba načina uzgoja (iz prirodne i plantažne šume) kako bi se utvrdila mehanička svojstava drva prema standardu ASTM. Analiza varijance pokazala je da način uzgoja crne johe (prirodna i plantažna šuma), radijalni položaj, kao i interakcija između položaja samog stabla i položaja uzorka u radijalnome smjeru nisu imali statistički značajnog utjecaja na modul elastičnosti, modul loma pri savijanju, kao ni na naprezanje na granici elastičnosti. Radijalni položaj uzoraka imao je značajnog utjecaja samo na gustoću drva. Gustoća drva povećavala se u radijalnom smjeru od srčike prema kori, bez obzira na način uzgoja šuma. Općenito, ispitivana mehanička svojstva drva crne johe iz plantažne šume bila su nešto bolja od mehaničkih svojstava drva iz prirodne šume. Odnos između gustoće drva i ispitivanih mehaničkih svojstava analiziran je linearnom regresijom. Utvrđen je pozitivan odnos između gustoće drva i ispitivanih mehaničkih svojstava za oba načina uzgoja šuma. Ti odnosi između gustoće drva i ispitivanih mehaničkih svojstava jače se očituju u drvu johe iz plantažnog uzgoja nego iz prirodnog uzgoja

Effect of Cultivation Methods on Wood Static Bending Properties in Alnus Glutinosa