Study of plant population density by quadrat method

# Real Lab Procedure

• In the selected site of study, hammer the nails firmly without damaging the vegetation.
• Fix four nails to make a square.
• Tie each end of the nails using a thread, to make a 1 m X 1 m quadrat.
• Similarly make nine more quadrats randomly in the site of study.
• Count the number of individuals of a species “A” present in the first quadrat.
• Record the data in the table.
• Similarly count the number of individuals of the species “A” in other quadrats respectively and record the data in the table.
• Count the number of individuals of a species “B” present in the all quadrat.
• Record the data in the table.
• Repeat the same procedure for species C and record the data in the table.
• We can calculate the density of plant population by this equation:
• Density =Total number of individuals of the species in all the sampling  unit (S) / Total number of sampling units studied (Q)

# Observations

 Plant Species Number of individuals in Each quadrats Total Number of Individuals (S) Total Number of Quadrats Studied (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 2.0 C 4 0 0 3 0 6 0 0 1 2 19 10 1.9

The density value thus obtained is then expressed as number of individuals per unit area.

# Simulator Procedure (as performed through the Online Labs)

• You can select the environment for study from the ‘Select the environment’ drop down list.
• Click on the popup corresponding to each quadrat to enlarge the view.
• Count the number of individuals of a species present in each quadrat and enter in the worksheet.
• Click on the back button to show normal view of the quadrat.
• Based on the values entered, the worksheet gives the plant population density for each species.
• You can redo the experiment by clicking on the ‘Reset’ button.