مقايسه روند تجزيه لاشبرگ توسكاييلاقي در دو رويشگاه با سنگ مادري متقاوت در شرايط آزمايشگاهي يكسان

A Comparison of Decomposition Rate in Alnus subcordata Leaf Litter from Two Forest Stands of Different Parent Materials and under Similar (Laboratory) Conditions

In order to determine the rate of litter decomposition in Alnus subcordata in two alder stands, litters from Vaz and Asalem with different parent materials were collected in autumn. Litters from each region were put in four vases for 7 months in laboratory conditions. Sampling was done within every 21 days. Nitrogen and carbon content were measured in each interval. On the first day, the comparative study between the two regions showed that there existed no significant difference between C and N content in litters. The amounts of N were 2.49 % and 2.62 % in litters of Vaz and Asalem respectively. Carbon content was 43.35 % ,in Vaz and 33.9 % in Asalem. Rate of carbon variation indicated no significant difference in the two regions. Rate of nitrogen and C/N variation exhibited a significant difference in the two regions. C/N was reduced from 17.38 to 10.35 and from 15.12 to 10.67 in Vaz and Asalem stands respectively.