Study of Physical and Chemical Soil Properties Variations Using Principal Component Analysis Method in the Forest, North of Iran

The field study was conducted in one district of Educational-Experimental forest at Tehran University (Kheirood-Kenar forest) in the North of Iran. Eighty-five soil profiles were dug in the site of study and several chemical and physical soil properties were considered. These factors included: soil pH, soil texture, bulk density, organic carbon, total nitrogen, extractable phosphorus and depth of soil. Principal Component Analysis (PCA), was used to identify the variations of soil properties. Results showed that there are significant relationships between some soil factors and two PCA axes. Content of clay in A۱ and A۲ horizons, bulk density, organic carbon and total nitrogen in A۱ horizon, and content of silt in A۲ horizon, correlated to the first PCA axis. Content of clay, pH, carbon percentage and silt content of B۱ Horizon, and soil depth, were the most important factors correlated to the second PCA axis. Soil profiles that consist high content of clay, with heavy soil texture, and soil profiles with high content of silt, occupied different areas in the forest. The content of total nitrogen and organic carbon also varied noticeably amongst the soil profiles. The variations of soil properties showed correlation with the distribution of trees and variations of altitude.   REFERENCES Asly, A and Etter, H. (۱۹۶۹) Forest Management Plan for EducationalExperimental Forest of Tehran University. Tehran University, Tehran. pp. ۳- ۱۰. Salehi and Zahedi ۱۳۷ Brady, N. C and Weil, R. R. (۱۹۹۰) The nature and properties of soil (Tenth edition۰ macmilan publishing company, ۶۲۱ p. Cornelissen, J. H. C, (۱۹۹۶) An experimental comparison of leaf decomposition rates in a wide range of temperate plant species and types. J. Ecol., ۴, pp. ۵۷۳- ۵۸۲. Edwards, C. A., D. E. Reichk and A. Crossley, (۱۹۷۰) The role of soil invertebrates in turnover of organic matter and nutrients. Springer- Verlog, New York: pp. ۱۴۷- ۱۷۲. Finzi, A. C. , Breemen, N. V., Canham, C. D. (۱۹۹۸) canopy tree-soil intraction whitin temperature forests: speices effects on carbon and nitrogen, Ecological application, ۸, ۴۴۰- ۴۴۶ Fisher, R. F and Binkley, D, (۲۰۰۰) Ecology and Management of Forest Soils (Third edition), John Wiley & sons, INC, ۴۸۹ p. Gerrard, A. J, (۱۹۸۱) Soils and landforms. George Allen & Unwin Ltd, ۲۱۹ pp. Goldsmith, F. B. (۱۹۷۳) The vegetation of exposed sea cliffs at South Stack, Anglesey. Ι. The multivariate approach. J. Ecol., ۶۱, ۷۸۷- ۸۱۸. Goodall, D. W. (۱۹۵۴) Objective methods for the classification of vegetation. III. An essay in the use of factor analysis. Australian J. of Botany, ۲, ۳۰۴- ۳۲۴. Gorji Bahri, Y, (۱۹۸۸) Quantitative and qualitative evaluation of Quercus/ Carpinus stands in Kheyrood-kenar forest, Msc thesis, Tehran University press, ۴۷ p. Habibi, H, (۱۹۷۴) Investigation of influence of soil texture on Beech trees’ growth rate in Iran. Journal of Iranian Natural Resources, ۳۱, ۶۱- ۶۹. Habibi, H. (۱۹۸۴) Study of the soils in beech forests of Iran and their role in distribution of different beech type. Journal of Iranian Natural Resources, ۳۸, ۱- ۱۵. Habibi, H, (۱۹۹۲) Investigation of Hornbeam’s forest soils in Mazandaran province and its roles in quality of forest stands. Journal of Iranian Natural Resources, ۳۸, ۱۷-۲۵. Hill, M. O., Bunce, R. G. H., Shaw, M. W., (۱۹۷۶) Indicator species analysis, a divisive polythetic method of classification and its application to a survey of native pine woods in Scotland. J. Ecol. ۶۳, ۵۹۷-۶۱۳. Kent, M and Coker, P (۱۹۹۶) Vegetation Description and Analysis, A Practical Approaches. John Wiley & sons, ۶۵۰ pp. Lorphelin, L. and kichi, P. (۱۹۸۷) the soil of the typical slope in the Himalayas (Nepal); their main characteristics and distribution. Catena, ۱۴۶, ۵۳۳- ۵۵۰ Makarov, M. I., Malysheva, T. I., Haumaier, L., Alt, H.G and Zech, W., (۱۹۹۷) The forms of phosphorus in Humic and Fulvic acids of a toposequence of alpine soils in the northern Caucasus. Geoderma, ۸۰, ۶۱- ۷۳. McCune, B. (۱۹۹۷) Influence of noisy environmental data on canonical correspondence analysis. Ecology, ۷۸, ۲۶۱۷- ۲۶۲۳. Mesdaghi, M, (۲۰۰۰) Vegetation description and analysis: a practical approach. Jehad Daneshgahi of Mashhad, Mashhad, pp. ۱۶۱- ۱۷۹. Moghadam, M. R, (۲۰۰۰) Quantitative Plant Ecology. Tehran University, Tehran, pp. ۲۳۳- ۲۷۹. Pourbabaei, H, (۲۰۰۴) Statistical Ecology. Guilan University, pp. ۲۹۳- ۳۱۹. Salehi, A. (۲۰۰۴) Investigation of physical and chemical soil properties variations in relation to trees composition and topographic factors in Nam-Khaneh district of educational-Experimental forest of Tehran University (Kheirood-Kenar forest).  PhD Dissertation, Tehran University, Tehran. ۱۸۷ p. Sarmadian, F and Jafari, M (۲۰۰۱) Investigation of forest soil in EducationalExperimental forest of Tehran University. Journal of Iranian Natural Resources, Special Issue, ۱۱۱p. Schoenholtz, S. H, Van Miegroet, H, Burger, J. A (۲۰۰۰) A review of chemical and physical properties as indicators of forest soil quality: challenges and opportunities. Forest ecology and management, ۱۳۸, ۳۳۵-۳۵۶.

کلیدواژه ها:

chemical and physical soil properties ، Multivariate analysis methods ، Principal Component Analysis (PCA) ، Forest of North of Iran