Biodiv Sci ›› 2010, Vol. 18 ›› Issue (2): 208-214. DOI: 10.3724/SP.J.1003.2010.222
Prakash Tripathi Om1,*(), Rangdajied Reynald Khongjee2
Received:
2009-04-10
Accepted:
2010-01-06
Online:
2010-03-20
Published:
2010-03-20
Contact:
Prakash Tripathi Om
Prakash Tripathi Om, Rangdajied Reynald Khongjee. Effect of forest fragment size on tree diversity and population structure of humid subtropical forest of Meghalaya, India[J]. Biodiv Sci, 2010, 18(2): 208-214.
Community parameters | Size of the forest fragments | |||
---|---|---|---|---|
0.5-ha | 1-ha | 2-ha | 5-ha | |
Woody species | ||||
Species richness | 24 | 24 | 28 | 33 |
Number of genera | 22 | 21 | 25 | 28 |
Number of families | 19 | 17 | 22 | 21 |
Stand density (/ha) | 700 | 810 | 900 | 1590 |
Basal area (m2/ha) | 36.4 | 37.2 | 39.8 | 39.2 |
Shannon’s diversity index | 2.67 | 2.91 | 2.93 | 3.15 |
Simpson’s dominance index | 0.11 | 0.07 | 0.08 | 0.06 |
Saplings | ||||
Species richness | 10 | 9 | 12 | 15 |
Number of genera | 10 | 9 | 10 | 14 |
Number of families | 8 | 7 | 9 | 13 |
Stand density (/ha) | 65,000 | 52,500 | 60,000 | 77,500 |
Seedlings | ||||
Species richness | 11 | 13 | 14 | 16 |
Number of genera | 10 | 11 | 13 | 14 |
Number of families | 10 | 10 | 12 | 13 |
Stand density (/ha) | 80,000 | 90,000 | 91,500 | 102,500 |
Table 1 Overall community parameters of the selected forest fragments in subtropical humid forest of Meghalaya
Community parameters | Size of the forest fragments | |||
---|---|---|---|---|
0.5-ha | 1-ha | 2-ha | 5-ha | |
Woody species | ||||
Species richness | 24 | 24 | 28 | 33 |
Number of genera | 22 | 21 | 25 | 28 |
Number of families | 19 | 17 | 22 | 21 |
Stand density (/ha) | 700 | 810 | 900 | 1590 |
Basal area (m2/ha) | 36.4 | 37.2 | 39.8 | 39.2 |
Shannon’s diversity index | 2.67 | 2.91 | 2.93 | 3.15 |
Simpson’s dominance index | 0.11 | 0.07 | 0.08 | 0.06 |
Saplings | ||||
Species richness | 10 | 9 | 12 | 15 |
Number of genera | 10 | 9 | 10 | 14 |
Number of families | 8 | 7 | 9 | 13 |
Stand density (/ha) | 65,000 | 52,500 | 60,000 | 77,500 |
Seedlings | ||||
Species richness | 11 | 13 | 14 | 16 |
Number of genera | 10 | 11 | 13 | 14 |
Number of families | 10 | 10 | 12 | 13 |
Stand density (/ha) | 80,000 | 90,000 | 91,500 | 102,500 |
Distribution pattern | Forest fragments | |||||
---|---|---|---|---|---|---|
0.5-ha | 1-ha | 2-ha | 5-ha | |||
Regular | 0 (0%) | 0 (0%) | 2 (7%) | 1 (3%) | ||
Random | 12 (50%) | 8 (33%) | 11 (39%) | 12 (36%) | ||
Contagious | 12 (50%) | 16 (66%) | 15 (53%) | 20 (60%) | ||
Total | 24 (100%) | 24 (100%) | 28 (100%) | 33 (100%) |
Table 2 Distribution pattern (based on Whitford index) of trees in different forest fragments of humid subtropical forest of Meghalaya. Values in the parentheses are the percentage of the total number of species in given forest fragments.
Distribution pattern | Forest fragments | |||||
---|---|---|---|---|---|---|
0.5-ha | 1-ha | 2-ha | 5-ha | |||
Regular | 0 (0%) | 0 (0%) | 2 (7%) | 1 (3%) | ||
Random | 12 (50%) | 8 (33%) | 11 (39%) | 12 (36%) | ||
Contagious | 12 (50%) | 16 (66%) | 15 (53%) | 20 (60%) | ||
Total | 24 (100%) | 24 (100%) | 28 (100%) | 33 (100%) |
Forest fragments (ha) | Sorensen similarity index (%) | Whittaker β-diversity index |
---|---|---|
0.5 and 1 | 58.3 | 0.42 |
1 and 2 | 53.8 | 0.50 |
2 and 5 | 62.3 | 0.48 |
5 and 0.5 | 52.6 | 0.51 |
1 and 5 | 49.1 | 0.54 |
2 and 0.5 | 65.4 | 0.38 |
Table 3 Sorensen’s similarity index (%) and Whittaker’s β-diversity index (dissimilarity) in different forest fragments of humid subtropical forest of Meghalaya
Forest fragments (ha) | Sorensen similarity index (%) | Whittaker β-diversity index |
---|---|---|
0.5 and 1 | 58.3 | 0.42 |
1 and 2 | 53.8 | 0.50 |
2 and 5 | 62.3 | 0.48 |
5 and 0.5 | 52.6 | 0.51 |
1 and 5 | 49.1 | 0.54 |
2 and 0.5 | 65.4 | 0.38 |
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