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Abstract:

Given the importance of plantation in semi-arid forests to achieve sustainable ecosystems need to consider a number of criteria for Plantation. The aim of this study is an investigation of nutrient status of tree, Understory vegetation biodiversity, Topsoil Properties and It،s carbon sequestration in Coniferous and Hardwood Monocultures Makhmalkoh in City of Khoramabad. Therefore full Inventory applied to measure quantitative and qualitative characteristics of Stand. In this study selective sampling method (10 dominate healthy trees on the center Stand ) used for the preparation of leaf samples for investigation of nutrient status and resorption, gathering of soil (depth 0-10 cm) and Understory Vegetation Biodiversiy assessment (from 1 × 1 m plots in four aspect under canopy and in North aspect tree to the open space). To calculate biodiversity index Past Software, for data analysis Excel linked with Spss18 software, finally for selecting the best varieties and weighting the AHP method based expert choice software were used. The results indicated that Softwood species had the best qualitative and quantitative Characteristics and the Fraxinus excelsior had the worst status among the species. Coniferous species had not significant negative effect on quantitative and qualitative soil characteristics. Also, these species had the highest soil carbon sequestration and economic value, while Olea had the least economic value and carbon sequestration. Diversity index comparsion results showed that Pinus nigra in hardwood group has the highest biodiversity similar to broad leave while Cupressus arizonica has the lowest biodiversity. The nutrients resorption trend in Pinus brutia and Cupressus arizonica was K> P > N, in Fraxinus excelsior and Cercis siliquastrum was K>N>P while in Olea was P>N>K. The nutrients resorption amount was different in each of the studied species. Cercis siliquastrum had the highest resorption within the three elements (nitrogen, phosphorus and potassium) and Cupressus arizonica had the lowest resorption of phosphorus and potassium. It is considering Nitrogen element it is located in one group wihte other kinds, which their from theview of Nitrogen element were lower than Cercis siliquastrum. According to AHP Method the final results showed that the Pinus brutia and Cercis siliquastrum are the best species and Fraxinus excelsior is the worst species for the plantation in the region.
Keywords: forestry, soil carbon sequestration, resorption, Analytical Hierarchy processes (AHP), Makhmalkoh

Sari Agricultural Sciences and Natural Resources University
Faculty of Natural Resources

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