Study the Plant Population Density by Quadrat Method


To study the plant population density by the quadrant method.

Materials Required

  • Nail.
  • Thread
  • Hammer


  1. Select a site for the study and hammer the nails on the site without harming the vegetation.
  2. Fix four nails in the form of a square.
  3. Each end of the nail is tied with the help of a thread making a 1m*1m quadrant.
  4. Nine more similar quadrants are made at the site of the study.
  5. The number of individuals of the species A present in the first quadrant is counted and the data is recorded in the table.
  6. The number of individuals of species A in other quadrants is also counted and the data is recorded in the table.
  7. Similarly, count the number of individuals of species B and C present in all the quadrants and record the data in the table.
  8. The density of the plant population is then calculated by the following equation:
\(Density = \frac{Total number of individuals of the species in all sampling units (S)} {Total number of sampling units studied (Q)}\)

D = S/Q


Plant Species Number of individuals in each quadrant Total number of individuals (S) Total number of quadrants (Q) Density (D)=S/Q
A 2 0 5 7 10 0 0 0 0 3 27 10 2.7
B 1 0 4 0 8 0 3 0 0 2 20 10 2
C 4 0 0 3 0 6 0 0 1 2 19 10 1.9


The population density is the highest for species A and the lowest for species C. The density value is expressed as the number of individuals per unit area.

Also Read: Parts of Plants

Learn more in detail about the plant population density, other related topics and experiments at BYJU’S Biology.

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