Pun-chun Crown-meter

Measurements of tree crown are not only important in assessing the growth dynamics and potentials and to carry out silvicultural manipulations, but also for determining precisely the gaps in canopy which influence the occurrence and frequency of regeneration, pests, wildlife, etc. However, accurate measuring and mapping of crowns have proved difficult with the known crown-meters. A summary review of the literature is included. Requirements of an efficient type of crown-meter have been brought out and based on these considerations, construction and use of a "Pun-Chun Crown-Meter" have been described. It is a see-through plumb-bob type. A prototype instrument was also constructed, and the experience gained in the use of this instrument confirms that the Pun-Chun Crow-Meter bears the following merits: (1) It is cheap and can be constructed almost at no cost. (2) It is simple in construction and can easily and quickly be prepared by anyone. (3) It is simple to operate and can be entrusted to even the lower category of staff for taking precise measurements. (4) It can be used with equal efficiency both for isolated trees and those standing in a close-canopied forest. (5) It is light and handy to use. (6) It measures the crown radii most precisely. (7) It can be used with utmost speed, without impairing accuracy and causing undue fatigue. (8) Measurements taken in the field can conveniently be plotted in office to draw crown maps.