Nutrient return and nutrient retranslocation in Acer velutinum Boiss in Caspian forest (Case study: Nav/Asalem)

In this research nutrient return and nutrient retranslocation in Acer velutinum in some parcels of district 1 from watershed number 7 where, Acer velutinum show preferred establishment and distribution, were investigated. In each sampling plots, taken randomly in appropriate sites of Acer velutinum, soil samples, fresh and senescent leaves were taken and then C, N, Ca, Mg and P were analyzed. The statistical analysis showed that all of the variables amongst the soil, the fresh and senescent leave have significant differences. The amount of C, N and P was higher in fresh leaf compare with senescent leaves and in fact they retransloct more, whereas Ca and Mg were returned more by litter to the soil. Apart from N and Ca the process of nutrient in the soil was similar to what has happened in the leaves. The type of nutrient return and nutrient retranslocation suggests the higher require of Acer velutinum to nutrient elements. On the other hand, the quality of the leaves of Acer velutinum also is a positive role in increasing soil fertility.