Letter | Published:

Determination of Plant Densities

Naturevolume 162page257 (1948) | Download Citation



IN surveying plant associations, it is usual to determine the valence by noting the presence or absence of each species in sample areas, and the density by counting the number of individuals of each species in the same, or other, sample areas. Two difficulties are frequently encountered in determining densities by this method, the length of time needed in the field and the intermingling of root systems of individual plants of the same species with consequent indecision as to the exact number present in the sample. The following method has the advantage of requiring one set of observations only, from which valence and density may be determined, and of avoiding counts within the sample areas.

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  1. Biology Department, Cheltenham Grammar School

    • E. J. MACHIN


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