مقايسه روند تجزيه لاشبرگ ممرز از دو رويشگاه در شرايط آزمايشگاهي يكسان

Comparison of decomposition rate in Carpinus betulus litters from two forest stands in similar conditions

In order to determine the rate of litter decomposition of hornbeam (Carpinus betulus L.) at two forest stands, litters from Vaz and Asalem with different parent material were collected in autumn. Litters of in each region were put in four vases for 400 days at laboratory conditions. Sampling was carried out in 21 intervals and the nitrogen and carbon content were measured each interval. The result revealed that on the first day, contrary to C content, N content of litter was significantly different (p<0.05). The content of N was 1.13 % and 1.32 % in litter of Vaz and Asalem, respectively. The content of C was 43.38 % in Vaz and 41.12% in Asalem . The rate of changes in C and N content and also the C/N ratio were statistically different in two regions. C/N of litter reduced from 38.39 to 18.21 and from 31.15 to 18.50 in Vaz and Asalem respectively. The decompositionn rate of litter from Vaz region (calcareous parent material) was higher than those from Asalem region (acidic parent marerial).