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Pure plantations reduce soil fertility so sustainable production can't be accessible. Because poplar plantations can be means for reducing harvest from forest so it is essential to have special plans for them before developing there plantations. In these study nutrients of live and senescent leaves of plantations of Populus deltoides Marsh. and Alnus subcordata C.A.Mey. have studied in pure and mixed plantations in a completely randomized block near Chamestan in north of Iran. Nitrogen content of live and senescent leaves of A. subcordata was greater than P. deltoides but Ca was greater in live and senescent leaves of P. deltoids and Mg was greater in senescent leaves of P. deltoides and P and K don't show any significant differences. Live and senescent leaves of P. deltoides in mixed treatments with A. subcordata showed more N than pure ones. There haven't seen any important differences about other nutrients. Finally we can conclude that mixing A. subcordata in plantations of P. deltoides in this location and with these conditions is profitable.