Research Journal of Environmental Sciences1819-34122151-8238Academic Journals Inc.10.3923/rjes.2009.640.644Alnus subcordata) in Fertility of Forest Soil]]>TaleshiS.A.R. DhumalK.N. AlipourA. EspahbodiK. GhasemiO. 6200936This research was carried out in natural Alder (Alnus subcordata C. A. Meyer) stands for evaluation effects of Alder trees on restoration of forest soil in North forest of Iran. The soil samples and different parts of Alder such as leaves, barks, roots and nodules were collected from three altitudes zone in Alder and birch stands. Mineral amount of plant and soil sample were analyzed in laboratory by standard methods. Results of mineral analysis in deferent parts of Alder revealed that the amount of nitrogen and phosphorus in leaves significantly more than bark and root. Generally the fallen leaves of Alder remained in the soil as a source of nitrogen. Amount of nitrogen in nodules was significant higher than roots. Nitrogen analysis of soil profiles in two Alder and birch stands also showed that mean amount of nitrogen in Alder stand was significantly more than birch stand. Overall, the results indicated the positive role of Alder trees in restoration of soil fertility by nitrogen fixation.]]>Arnebrant, K., H. Ek, R.D. Finlay and B. Soderstrom,1993Alnus glutinosa (L.) Gaertn. seedlings inoculated with Frankia sp. and Pinus contorta Doug, ex Loud seedlings connected by a common ectomycorrhizal mycelium.]]>124213242Canhoto, C. and M.A.S. Graca,1996Eucalyptus globulus leaves and three native leaf species (Alnus glutinosa, Castanea sativa and Quercus faginea) in a portuguese low order stream.]]>3337985Dawson, J.O.,19901990pp: 299-316pp: 299-316Hurd, T.M., D.J. Raynal and C.R. Schwintzer,20012-fixation of Alnus incana ssp. rugosa in shrub wetlands of the adirondack mountains.]]>12694103Kramer, P.A., D. Zabowski, G. Scherer and R.L. Evwrwtt,20002917701777Malcolm, D.C., J.E. Hooker and C.T. Wheeler,1985Frankia symbiosis as a source of nitrogen in forestry: A case study of symbiotic nitrogen-fixation in a mixed Alnus-Picea plantation in Scotland.]]>85263282Tarrant, R.F. and M.J. Trappe,197135335348Rodriguez-Barrueco, C., C. Miguel and P. Subramaniam,1984Ainus glutinosa (L.) Gaertn.) from the field.]]>78201208Roggy, J.C., A. Moiroud, R. Lensi and A.M. Domenach,20042-fixing actinorhizal species and the non-N2-fixing Prunus avium under partially controlled conditions.]]>39312319Stephan, A., A.H. Meyer and B. Schmid,200088988998Virtanen, A.I.,195710164169Scott, E.E., S.S. Perakis and D.E. Hibbs,200815N patterns of douglas-fir and red alder riparian forests in the oregon coast range.]]>54140147Harrington, C.A.,2002Alnus rubra Bong.]]>2002Gaulke, L.S., C.L. Henry and S.L. Brown,2006Alnus rubra amended with low and high metal content biosolids.]]>63351360Rezaei Taleshi, S.A.,20082008Sagheb-Talebi, Kh., T. Sadjedi and F. Yazdian,2003Tarrant, R.F. and R.E. Miller,196327231234Trappe, J. M., J.F. Franklin, R.F. Tarrant and G.M. Hansen,19681968pp: 292