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Soil organic carbon (SOC) storage in forest ecosystems plays a major role in the global carbon cycle. Soil carbon across an age sequence may vary of Chir pine forest. In this study, based on the silvicultural shelterwood management system, forest area was classified into stands of three different age groups, including young stand, mature stand, and over-mature stand. Soil carbon density was assessed in each stand at three depths (0-20, 20-40, and 40-60 cm) by Walkley Black method. The results showed that SOC was higher in different stand ages at a depth of 0-20 cm as compared to the 20-40, and 40-60 cm depth. Altogether, the average potential of soil carbon density at a depth of 0-60 cm in young, mature and over-mature stand ages of Chir Pine forest was 70.96 (Mg C ha), 68.96 (Mg C ha) and 61.02 (Mg C ha), respectively. The result indicates that soil carbon stock decreases with increasing forest stand ages. The results confirm that-current management operations such as cutting, thinning, tending, may affect the soil carbon. Moreover, we recommended the regular periodic survey of soil and permanent sample plot establishment is necessary for the accurate soil carbon measurement in different stand ages of Chir pine forest.

SOIL ORGANIC CONTENT OF STANDS OF DIFFERENT AGES IN A SUBTROPICAL CHIR PINE (PINUS ROXBURGHII) FOREST OF PAKISTAN