وحید حسینی

In order to determine the rate of litter decomposition of Alnussubcordata at two alder stands, litters from Vaz and Asalem withdifferent parent material were collected in autumn. Litters of eachregion, put in four vases for 7 months in laboratory conditions.Sampling was taken within 21 days. Then nitrogen and carbon wasmeasured in each interval. On the first day, the comparative studybetween two regions showed that there exits no significant differencebetween C and N contents of litters.The amount of N was 2.49 % and 2.62 % in litter of Vaz and Asalemrespectively. The amount of C was 43.35 % in Vaz and 33.9 % inAsalem. Rate of carbon variation showed no significant difference intwo regions. Rate of nitrogen and C/N variation showed significantdifference in two regions.C/N of litter reduced from 17.38 to 10.35 and from 15.12 to 10.67 inVaz and Asalem respectively