Biodiversity & Conservation

, Volume 13, Issue 2, pp 421–436

Effects of anthropogenic disturbance on plant diversity and community structure of a sacred grove in Meghalaya, northeast India

  • B.P. Mishra
  • O.P. Tripathi
  • R.S. Tripathi
  • H.N. Pandey
Article

Abstract

This study analyses the effects of anthropogenic disturbance on plant diversity and community attributes of a sacred grove (montane subtropical forest) at Swer in the East Khasi Hills district of Meghalaya in northeast India. The undisturbed, moderately disturbed and highly disturbed stands were identified within the sacred grove on the basis of canopy cover, light interception and tree (cbh ≥ 15 cm) density. The undisturbed forest stand had >40% canopy cover, >50% light interception and a density of 2103 trees per hectare, whereas the highly disturbed stand had <10% canopy cover, <10% light interception and 852 trees per hectare. The moderately disturbed stand occupied the intermediate position with respect to these parameters. The study revealed that the mild disturbance favoured species richness, but with increased degree of disturbance, as was the case in the highly disturbed stand, the species richness markedly decreased. The number of families of angiosperms was highest (63) in the undisturbed stand, followed by the moderately (60) and highly disturbed (46) stands. The families Rubiaceae, Asteraceae and Poaceae were the dominant families in the sacred forest. Rubiaceae was represented by 11, 14 and 10 species in the undisturbed, moderately disturbed and highly disturbed stands, respectively, whilst the family Asteraceae had 16 species in the moderately disturbed stand and 14 species in the highly disturbed stand. The number of families represented by a single species was reduced significantly from 33 in the undisturbed stand to 23 in the moderately and 21 in the highly disturbed stand. The similarity index was maximum (71%) between the undisturbed and moderately disturbed stand and minimum (33%) between the undisturbed and highly disturbed stands. The Margalef index, Shannon diversity index and evenness index exhibited a similar trend, with highest values in the moderately disturbed stand. In contrast, the Simpson dominance index was highest in the highly disturbed stand. There was a sharp decline in tree density and basal area from the undisturbed (2103 trees ha−1 and 26.9 m2 ha−1) to the moderately disturbed (1268 trees ha−1 and 18.6 m2 ha−1) and finally to the highly disturbed (852 trees ha−1 and 7.1 m2 ha−1) stand. Density–girth curves depicted a successive reduction in number of trees in higher girth classes from the undisturbed to the moderately and highly disturbed stands. The log-normal dominance–distribution curve in the undisturbed and moderately disturbed stands indicated the complex and stable nature of the community. However, the short-hooked curve obtained for the highly disturbed stand denoted its simple and unstable nature.

Disturbance Montane subtropical forest Plant diversity Sacred grove Tree population structure 

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References

  1. Anonymous 1978. Tropical Forest Ecosystems: A State of Knowledge Report. UNESCO/UNEP/FAO, Paris, France.Google Scholar
  2. Balakrishnan N.P. 1981-1983. Flora of Jowai and Vicinity, Meghalaya, 2 Volumes. Botanical Survey of India, Howrah, India.Google Scholar
  3. Barik S.K., Tripathi R.S., Pandey H.N. and Rao P. 1996. Tree regeneration in a subtropical humid forest: effect of cultural disturbance on seed production, dispersal and germination. Journal of Applied Ecology 33: 1551–1560.Google Scholar
  4. Bhuyan P., Khan M.L. and Tripathi R.S. 2001. Tree diversity and population structure in undisturbed and human-impacted tropical wet evergreen forests of Arunachal Pradesh, north-east India. In: Ganeshaiah K.N., Uma Shaanker R. and Bawa K.S. (eds), Tropical Ecosystems: Structure, Diversity and HumanWelfare.: Proceedings of International Conference on Tropical Ecosystems. Oxford-IBH, New Delhi, India, pp. 114–115.Google Scholar
  5. Champion H.G. and Seth S.K. 1968. A Revised Survey of Forest Types of India. Government of India Press, Delhi, India.Google Scholar
  6. Connell J.H. 1978. Diversity in tropical rain forests and coral reefs. Science 119: 1302–1309.Google Scholar
  7. Dansereau P. 1960. The origin and growth of plant communities. In: Zarrow M.X. (ed.), Growth in Living System: Proceedings of International Symposium on Growth, Purdue University, Indiana. Basic Books, New York, pp. 563–603.Google Scholar
  8. Davis G. and Richardson D. 1995. Mediterranean Type Ecosystems: The Function of Biodiversity. Springer, Berlin, Germany.Google Scholar
  9. Haridasan K. and Rao R.R. 1985-1987. Forest Flora of Meghalaya, 2 Volumes. Bishen Singh Mahendra Pal Singh, Dehra Dun, India.Google Scholar
  10. Kadavul K. and Parthasarathy N. 1999. Structure and composition of woody species in tropical semievergreen forest of Kalrayan Hills, Eastern Ghats, India. Tropical Ecology 40: 247–260.Google Scholar
  11. Margalef R. 1958. Information theory in ecology. General Systems 3: 36–71.Google Scholar
  12. Misra R. 1968. Ecology Work Book. Oxford Publishing Company, Calcutta, India.Google Scholar
  13. Mueller-Dombois D. and Ellenberg H. 1974. Aims and Methods of Vegetation Ecology. John Wiley and Sons, New York.Google Scholar
  14. Parthasarathy N. and Karthikeyan R. 1997. Plant biodiversity inventory and conservation of two tropical dry evergreen forests on the Coromandel Coast, South India. Biodiversity and Conservation 6: 1063–1083.Google Scholar
  15. Parthasarathy N. and Sethi P. 1997. Tree and liana species diversity and population structure in a tropical dry evergreen forest in south India. Tropical Ecology 38: 19–30.Google Scholar
  16. Phillips E.A. 1959. Methods of Vegetation Study. Henry Holt & Co., New York.Google Scholar
  17. Pielou E.C. 1966. The measurement of diversity in different types of biological collections. Journal of Theoretical Biology 13: 131–144.Google Scholar
  18. Raizada A., Joshi S.P. and Srivastava M.M. 1998. Composition and vegetational diversity in an alpine grassland in the Garhwal Himalayas. Tropical Ecology 39: 133–141.Google Scholar
  19. Shannon C.E. and Weaver W. 1949. The Mathematical Theory of Communication. University of Illinois Press, Urbana, Illinois, pp. 1–117.Google Scholar
  20. Simpson E.H. 1949. Measurement of diversity. Nature 163: 688.Google Scholar
  21. Solbrig O.T. 1991. From Genes to Ecosystems: A Research Agenda for Biodiversity. IUBS-SCOPEUNESCO, Harvard, Cambridge, Massachusetts, p. 124.Google Scholar
  22. Sørensen T. 1948. A method of establishing group of equal amplitude in plant sociology based on similarity of species content. Det Kong Danske Videnskabernes Selskab Biologiske Skrifter (Copenhagen) 5: 1–34.Google Scholar
  23. Terborgh J. 1992. Maintenance of diversity in tropical forests. Biotropica 24: 253–292.Google Scholar
  24. Thorington R.W. Jr., Tannenbaum B., Tarak A. and Rudran R. 1982. Distribution of trees in Barro Colorado Island: a five hectare sample. In: Leigh E.G. Jr., Rand A.S. and Windsor D.M. (eds), The Ecology of a Tropical Forest-Seasonal Rhythms and Long Term Changes. Smithsonian Tropical Research Institute, Washington, DC, pp. 83–94.Google Scholar
  25. Tiwari B.K., Barik S.K. and Tripathi R.S. 1998. Biodiversity value, status and strategies for conservation of sacred groves of Meghalaya, India. Ecosystem Health 4: 28–32.Google Scholar
  26. Visalakshi N. 1995. Vegetation analysis of two tropical dry evergreen forests in southern India. Tropical Ecology 36: 117–127.Google Scholar
  27. Whittaker R.H. 1975. Communities and Ecosystems. MacMillan Publishing Co., New York.Google Scholar
  28. Younes T. 1992. Ecosystem function of biodiversity: a progress report on the IUBS-SCOPE-UNESCO Programme. Bulletin Internationale 24: 16–21.Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • B.P. Mishra
    • 1
  • O.P. Tripathi
    • 1
  • R.S. Tripathi
    • 1
  • H.N. Pandey
    • 1
  1. 1.Department of Botany, School of Life SciencesNorth-Eastern Hill UniversityShillongIndia

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