Aim of the experiment: to determine species area curve for sampling of population by quadrate method.
Requirements: quadrate of definite size, graph sheet, pencil, scale.
Theory:The minimum size of the quadrate is equally determined by the species area curve method. The size of the quadrate is very important as too small or too large quadrate may not be representative of the community.
Procedure: the procedure is to lay a quadrate of small area in the sampling plot and the occurrence of the number of the species is observed. The plotting area is independent varieties (X-axis) and the occurrence of number of species, then plotting the area as the dependent variable (Y-axis)
The minimum quadrate size can be determined then the curve takes a horizontal shape indicating that the species number does not increase. The point where the curve flattens is joined with the X-axis. To find out the minimum area corresponding to the occurrence of maximum number of species. This method is very convenient for vegetation and analysis or plant analysis.
a. A quadrate of definite size is thrown randomly in the area provided for sampling of the species composition at different sites, all the different types of the species and their quantity. It determines the different species concept.
b. Calculate the total number of individuals of a species and total number of quadrate of occurrence of a species.
c. Calculate the total species types on each quadrate i.e. quadrate no and the new types of the species to the previous no. of quadrate.
d. Now plot the species area curve on a graph paper.
Result: the minimum of the two quadrate are required for complete sampling of the given areas curve.
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