 # Study the Plant Population Density by Quadrat Method

## Aim

To study the plant population density by the quadrant method.

• Nail.
• Hammer

## Procedure

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 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:
$$\begin{array}{l}Density = \frac{Total number of individuals of the species in all sampling units (S)} {Total number of sampling units studied (Q)}\end{array}$$

D = S/Q

## Observations

 Plant Species Number of individuals in each quadrant Total number of individuals (S) Total number of quadrants (Q) Density (D)=S/Q I II III IV V VI VII VIII IX X 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

## Conclusion

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.

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

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