Study on dynamism of the main nutrient elements along litter decomposition process of Bromus tomentellus Bornm

Since Bromes tomentellus is one of the most important species in natural ecosystems in Iran both quantitatively and qualitatively¡ this research investigated decomposition process of Bromes tomentellus through studying dynamism of the main nutrient elements and decomposition rate of leaves and stems of the plantin a period of one year. The litter bag technique with size of 20×20 cm and 2 mm pores was used in this research. Each bag was filled with 5 g dried plant specimens. A totallof 54 bags with leaf¡ stem¡ and combination of leaf and stem were placed with three replications in Hosein Abad Research Station. Bags were taken at intervals of 60 days (6 times in a year). The amount of nutrients N¡ C¡ K¡ P¡ and C/N in leaves¡ stems¡ and the combination of leaves and stems were measured after each sampling. The results showed that the percentage of N in leaf was 1.02 which was 0.65 and 0.34 more in comparison with the nitrogen content of stem and the combination of leaf and stem¡ respectively. Also¡ annual decomposition constants of leaves¡ stems¡ leaves and stems of this species were 1.22¡ 0.95¡ and 1.88 respectively.