Forest Biometry Exercise
Submitted By: Dhanraj
Meena
1. Short Introduction to Forest Biometry Exercise
Forest biometry is a scientific discipline that involves the measurement and analysis of
the physical characteristics of forests. The primary objective is to quantify the structure of
forest stands and estimate various parameters such as volume, biomass, and density. This
exercise focuses on volume estimation, a crucial metric for understanding the productivity and
resource potential of a forest.
2. Procedure or Process Followed for Volume Estimation: Sample Plot, Design, Figures
Sample Plot No. 1
Species: Araucaria cunninghamii (Spp. Code: 1312)
Plot Design: A systematic sampling approach was employed, selecting representative
plots within the forest. Diameter at Breast Height (D), Total Height, Crown Width 1
(CrownW1), Crown Width 2 (CrownW2), and Volume (Vol) were recorded for
individual trees in the sample plot.
S.No.
Name of Spp.
Spp. Code
Diameter Height
Vol
CrownW1 CrownW2 (cum)
1
Araucaria
cunninghamii
1312
50
28
4
3
1.0187
Araucaria
cunninghamii
1312
58
30
5
6
1.4918
Araucaria
cunninghamii
1312
17
9
3
3
0.0780
Araucaria
cunninghamii
1312
51
28
2
3
1.0715
Araucaria
cunninghamii
1312
60
30
3
4
1.6289
Araucaria
cunninghamii
1312
49
28
3
2
0.9675
Araucaria
cunninghamii
1312
57
29
4
3
1.4262
Araucaria
cunninghamii
1312
54
30
3
4
1.2406
Araucaria
cunninghamii
1312
68
33
6
5
2.2589
2
3
4
5
6
7
8
9
Total
11.1821
Sample Plot No. 2
Species: Sapindus mukorossi (Spp. Code: 1075) and Miscellaneous
Plot Design: Similar systematic sampling as in Plot 1, capturing a diverse representation
of species. Diameter at Breast Height (D), Total Height, Crown Width 1 (CrownW1),
Crown Width 2 (CrownW2), and Volume (Vol) were measured for each tree in the
sample plot.
S.No.
Name of Spp.
Spp.
Code
1
Sapindus
mukorossi
1075
22
8
8
7
0.1385
Sapindus
mukorossi
1075
17
10
5
6
0.0780
3
Sapindus
mukorossi
1075
12
8
4
6
0.0383
4
Miscellaneous
1075
13
6
7
6
0.0447
5
Sapindus
mukorossi
1075
22
11
5
7
0.1385
Sapindus
mukorossi
1075
18
10
6
7
0.0883
2
6
Diameter Height
Vol
CrownW1 CrownW2 (cum)
Total
3. Calculations for Volume Estimation
Volume Equation
The volume estimation was carried out using the following equation:
Volume (V)= (0.007602-0.033037*D+1.868567*(D^2)+4.483454*(D^3))
Where: D is the Diameter at Breast Height (DBH) of the tree.
4. Results and Conclusion
Sample Plot No. 1
Total Volume: 11.1821 cubic meters
Individual Tree Contributions: Trees varied in diameter, height, and crown dimensions.
0.5264
The species Araucaria cunninghamii demonstrated diverse volume contributions.
Sample Plot No. 2
Total Volume: 0.5264 cubic meters
Individual Tree Contributions:
The plot consisted of Sapindus mukorossi and Miscellaneous species.
Varied tree sizes contributed to the total volume.
5. Conclusion




The volume estimation equation provided accurate predictions based on tree diameter.
Araucaria cunninghamii and Sapindus mukorossi showed different growth patterns,
contributing to the overall diversity of the forest.
Accurate volume estimations are crucial for sustainable forest management and
resource planning.
This exercise enhances our understanding of the forest's structural attributes, supporting
informed decisions for conservation and utilization.