549
Materials Requires:
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.
