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Fertility of soil is reduced by unmixed forest planting as a result continuity of production will be stopped. One of the existing resolutions is mixed forest-planting along with stabilizing species. In this survey nutritional elements existing in senescent and living leaves of two speciespopulous deltoids and Alnus glutinosahas been investigated, in mixed and unmixed forest –planting in a completely randomized block in Fouman, Guilan. The sampling was done on September. Samples had been dried at 70°c. Total amount of nitrogen was measured by cajoled-L device by percentage. Phosphurs, Calsium, Potassium and magnesium is measured by absorption method with spectrophotometer device. The measured amount of nitrogen in senescent and living leaves of Alnus glutinosa is more than populous deltoids, while there is not a meaningful difference between the measured phosphors in living and senescent leaves of Alnus glutinosa and populous deltoids. Living and senescent leaves of populous deltoids in mixed controls accompanying Alnus glutinosa shows higher amount of nitrogen compare with unmixed controls that indicates effective role of Alnus glutinosa in nitrogen absorption. In general mixture planting of Alnus glutinosa and populous deltoids is effectively impact on forest – planting and forest conditions.

The Study of Leaves in Plantations of Poplar and Alder in Fouman Region of Iran