BLUE PINE IN PAKISTAN 



157 



A. 



Figure 4. Pinus walliahiana growing in mesic habitats 

 A. in Kagan, B. in southeastern Swat. 



intervening areas, indiscriminate cutting, excessive grazing, and fires 

 all have led to the existing isolated patches of blue pine. They are 

 restricted mainly to the remote areas in the Sulaiman range, Parachinar, 

 Dir, and Swat. 



GROWTH 



There are no reliable statistics available on growth and yield of 

 this species in West Pakistan. Field data are being collected and 

 techniques devised to prepare yield tables. These will be based on data 

 from remeasurements of permanent sample plots as well as on single 

 recordings from temporary plots. Growth has been found to be optimal 

 between 6,500 and 8,500 feet elevation. 



Early work on the collection of growth statistics related only to 

 parts of blue pine range included in the mesic habitat (Hazara and 

 Murree) . A. V. Monro in 1908 and M.R.K. Jerram in 1915 (cf. Troup, 

 1921) measured 109 trees and determined mean diameters as given below: 



