Document Type : Research Paper
Authors
1
MSc student of Forestry, Tarbiat Modarres University
2
Assistant Professors, Forestry Department, Tarbiat Modarres University, respectively
3
Assistant Professors, Forestry Department, Tarbiat Modarres University, respectively.
Abstract
In order to investigate effects of four tree species (Acer velutinum Boiss., Populus deltoides Marsh., Robinia pseudoacacia L., and Cupressus sempervirens L. Var. horizontalis) planted in 1987 at northern Iran Hyrcanian forests on some physicochemical soil properties, including: texture, color, thickness, saturation potential (SP), soil solution (SS), pH, EC, organic C (OC), organic matter (OM), total N, C/N ratio, available P and K. a field experiment was conducted on 10-hectare forest region 15 hm south of amol. soil sampling was done by collection 6 four horizons from each soil profile at three to four random sites in each selected stand of tree species plus a control site (without plantation).In each profile, soil was sampled separately from horizons O, A, B plus 30 cm of the first upper layer of the profile. Tree species, especially R. pseudoacacia, improved the physicochemical properties of the soil significantly, particularly BY increasing K, OC and OM in 30 cm of the upper layer AS well AS available K in A and B horizons, but decreased SS in A horizon. none of the tree secles assected soil texture or pH. The hardwood species increased O horizon thickness significantly. R. pseudoacacia increased total N, OC and OM in O horizon and total N in 30 cm of the upper layer, but decreased available P in A horizon. P. deltoids and A. Velutinum increased available P in A horizon and C. sempervirens increased SS in O horizon. Additionally, based on cluster analysis, we can infer that hardwood species affected the A horizon and the first 30 cm of upper layer, similarly, whereas P. deltoides and R. pseudoacacia affected A and B horizons similarly.
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