Prism sampling by compartments in mixed coniferous forests
Prism sampling by compartments in mixed coniferous forests
Ali Akbar Khan
ABSTRACT
To assess the accuracy and average deviation percent of
prism sampling vis-a-vis total enumeration in the mixed
temperate coniferous forests, seven compartments (390
hectares) of varying density, varying slope and species
composition of Kaghan Reserved Forests, were sampled, by
prism of B.A.F. 20 and also enumerated totally. This
paper is confined to the discussion of conifers only.
The deviation of Basal Area varies from 13 to 29%for
different compartments. The compartment wise variation
between total number of trees and total volume with
prism sampling and total enumeration ranged from 12 to
46% and 11 to 28% respectively. The variation between
stand tables (5 centimeters diameter classes) prepared
with prism sampling and those derived from total
enumeration was much wider. The volume estimates with
prism sampling for all area, varied from the volume
estimates of the total enumeration by minus 12% i.e.,
the prism sampling estimates were on lower side. It was
concluded that prism sampling technique may be used for
basal area and volume estimates with a per missile
deviation of 20% in the mixed temperate coniferous
forests, but it will not be advisable to use it for the
preparation of the stand tables, unless acceptable
accuracy is achieved by improving the application of
point sampling in all its ramification.
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March 1975
Vol. 25, Iss. 1
