Persian oak (Quercus brantii var. persica) is a dominant tree species of Zagros forests in a semi-arid area, western Iran. However, the capacity of biomass and carbon stocks of these forests is not well studied. We selected three types (seed-originated tree, coppice tree and mixed (seed-originated and coppice) tree) of Persian oak of Zagros forests in Dalab valley, Ilam Province, Iran to survey the capacity of biomass and carbon stocks in 2018. Thirty sample plots of 1000 m2 were systematically and randomly assigned to each forest type. Quantitative characteristics of trees, such as diameter at breast height (DBH), height, crown diameter and the number of sprouts in each sample plot were measured. Then, aboveground biomass (AGB), belowground biomass (BGB), aboveground carbon stock (AGCS) and belowground carbon stock (BGCS) of each tree in plots were calculated using allometric equations. The litterfall biomass (LFB) and litterfall carbon stock (LFCS) were measured in a quadrat with 1 m×1 m in each plot. One-way analysis of variance (One-Way ANOVA) and Duncan's test were performed to detect the biomass and carbon stock differences among the three forest types. Results showed that AGB, BGB and BGCS were significantly different among the three forest types. The highest values of AGB, AGCS, BGB and BGCS in seed-originated forest were 76,043.25, 14,725.55, 36,737.79 and 7362.77 kg/hm2, respectively. Also, the highest values of LFB and LFCS in seed-originated forest were 3298.33 and 1520.48 kg/hm2, respectively, which were significantly higher than those of the other two forest types. The results implies the significant role of seed-originated oaks for the regeneration of Zagros forests. Further conservation strategy of seed-originated oaks is an important step in the sustainable management of Zagros forests in Iran
