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The effect of single-tree selction system on soil properties in an oriental beech stand of Hyrcanian forest, north of Iran


, : The effect of single-tree selction system on soil properties in an oriental beech stand of Hyrcanian forest, north of Iran. Journal of Forestry Research 22(4): 591-596

A case study was conducted in beech forests of northern Iran to determine the effect of the created gaps on some soil properties in beech stand. Changes of soil properties in small (6 15 m2), medium (151 241 m2), large (242 332 m2) and very large (333 55 m2) gaps, as well as under closed stands were studied eight years after the gap creation. Soil samples were taken from three depths, 1, 1 2 and 2 3 cm. The gaps were different from their around undisturbed stands in terms of the following soil parameters: Mg+2 concentration of 1 cm at medium gap size, bulk density of 1 2 cm at very large gap size as well as K+ and Ca+2 concentrations at 2 3 cm at small and large gap sizes, respectively. Furthermore, the size of the gaps had no effect on soil characteristics through the whole profile. Water saturation percent (Sp %) at 1cm as well as P and Mg+2 at 2 3 cm was different amongst undisturbed stands around different gap sizes. The center and the edges of the gap were different only in terms of organic carbon at the depth of 1 2 cm. Significant differences were observed between gaps and closed canopy regarding P and Ca+2 at depth 1 cm and 1 2 cm, respectively. It can be concluded that applied silvicultural system for harvesting trees which created these gaps might be suitable for conservation and forest management in the region.

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