Page 208 - e-Book

recorded for developing a Digitized herbarium, for preserving the form, color and features in

its originality.

Data Analysis

The data collected was computerized and maintained as excel worksheets and subjected to
simple analysis. The important quantitative analysis such as density, frequency, and

abundance of tree species were determined as per Curtis and McIntosh (1950).

a) Abundance : It is the study of the number of individuals of different species in the

community per unit area. By quadrant method, samplings are made at random at several

places and the number of individuals of each species was summed up for all the quadrants
divided by the total number of quadrants in which the species occurred. It is represented by

the equation:

Abundance =

T ot al nu mber o f qu a d r at s i n w hi ch t he s pe ci e s oc cu r e d
¿
T ot a l nu mbe r o f i nd i vi d u al s o f a s pe ci e s i n al l qu ad r at s ¿

b) Frequency: This term refers to the degree of dispersion of individual species in an area and
usually expressed in terms of percentage of occurrence. It was studied by sampling the study

areas at several places at random and recorded the name of the species that occurred in each

sampling units. It is calculated by the equation:

Frequency (%) =
N umbe r o f q ua d r a t s i n w hi ch t he s pe ci e s oc cu r e d X 100
T ot a l nu mbe r o f qu ad r at s st ud i e d

c) Density: Density is an expression of the numerical strength of a species where the total

number of individuals of each species in all the quadrats is divided by the total number of

quadrats studied. Density is given by the equation:

Density =
T otal number o f individ uals o f a s pecies in all quad rats X 100

T otal number o f quad rats stud ied

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