Vegetos
(An International Journal of Plant Research & Biotechnology)
Forest structure and tree diversity along an altitudinal gradient in Sikkim Himalaya
*Article not assigned to an issue yet
Chettri Mamta, Sahoo Uttam Kumar, Kumar Devendra, Musa Faisal Ismail
Research Articles | Published: 31 December, 2024
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Keywords: Eastern Himalaya, Elevation gradient, Woody taxa, Forest types, Conservation
Abstract
The vegetation types of Sikkim Himalayas more particularly Southern Sikkim has not been studied before. This study is the first comprehensive one on the tree species diversity and composition across four forest types (Tropical semi evergreen forest (TSEF), Sub-tropical broad mixed leaved hill forest (STBLHF), Himalayan wet temperate forest (HWTF) and Sub alpine Forest (SAF) in the region. We employed quadrat sampling and all the trees > = 10 cm DBH at 1.37m height were considered for the purpose. A total of 130 tree species belonging to 91 genera and 52 families were recorded in the study sites of which Moraceae and Lauraceae represented the highest number of species (8 each). The tropical semi evergreen forest (TSEF) harboured 61 species, followed by sub-tropical broad mixed leaved hill forest (STBLHF) (59), Himalayan wet temperate forest (HWTF) (43) and sub-alpine forest (SAF) (25). The Shannon-Weiner diversity index (H’) in TSEF, STBLHF, HWTF and SAF was 3.31, 2.92, 2.82, and 2.34 respectively. The H’ showed a linear relation with elevation (R2 = 0.9265, p < 0.05) and the Margalef’s species richness (S) indicated a significant quadratic relation (R2 = 0.9996, p < 0.05) with elevation. A hump-shaped pattern was observed for tree species richness while the DBH size class showed a reverse J shaped pattern. It concluded that tree species diversity in South Sikkim Himalayas is primarily influenced by elevation, showing a linear decline in H′ and a hump-shaped pattern for species richness, peaking at mid-elevations. The reverse J-shaped DBH distribution indicates active regeneration, further supporting the observed diversity pattern.
References
Ahirwal J, Nath A, Brahma B, Deb S, Sahoo UK, Nath AJ (2021) Patterns and driving factors of biomass carbon and soil organic carbon stocks in the Indian himalayan region. Sci Total Environ 770:113972
Ao A, Changkija S, Tripathi SK (2021) Stand structure, community composition and tree species diversity of sub-tropical forest of Nagaland, Northeast India. Trop Ecol 62(4):549–562. https://doi.org/10.1007/s42965-021-00170-5
Aye YY, Pampasit S, Umponstira C, Thanacharoenchanaphas K, Sasaki N (2014) Floristic composition, diversity and stand structure of tropical forests in Popa Mountain Park. J Environ Prot 5(17):1588. https://doi.org/10.4236/jep.2014.517150
Behera MC, Sahoo UK, Mohanty TL, Prus P, Smuleac L, Pascalau R (2023) Species composition and diversity of plants along human-induced disturbances in tropical moist Sal forests of Eastern Ghats, India. Forests 14(10):1931. https://doi.org/10.3390/f14101931
Behera MC, Sahoo UK, Mohanty TL, Nayak S (2024) Sal-dominated forest influence the floristic composition, diversity and distribution pattern with special focus on the associated trees in the eastern ghats of Odisha. Int J Ecol Env Sci 50:711–726
Bharali S, Paul A, Khan ML, Singha LB (2011) Species diversity and community structure of a temperate mixed Rhododendron forest along an altitudinal gradient in West Siang District of Arunachal Pradesh, India. Nat Sci 9(12):125–140
Bhat JA, Kumar M, Negi AK, Todaria NP, Malik ZA, Pala NA, Kumar A, Shukla G (2020) Species diversity of woody vegetation along altitudinal gradient of the Western Himalayas. Global Ecol Conserv 24:e01302. https://doi.org/10.1016/J.GECCO.2020.E01302
Bhutia Y, Gudasalamani R, Ganesan R, Saha S (2019) Assessing forest structure and composition along the altitudinal gradient in the state of Sikkim, Eastern Himalayas, India. Forests, 10(8), p.633
Buragohain MK, Dar AA, Babu KN, Parthasarathy N (2023) Tree community structure, carbon stocks and regeneration status of disturbed lowland tropical rain forests of Assam, India. Trees Forests People 11:100371. https://doi.org/10.1016/j.tfp.2023.100371
Champion HG, Seth SK (1968) A revised survey of the forest types of India. Manager of
Curtis JT, McIntosh RP (1951) An upland forest continuum in the prairie-forest border region of Wisconsin. Ecology 32(3):476–496. https://doi.org/10.2307/1931725
Dash SS, Panday S, Rawat DS, Kumar V, Lahiri S, Sinha BK, Singh P (2021) Quantitative assessment of vegetation layers in tropical evergreen forests of Arunachal Pradesh, Eastern Himalaya, India. Curr Sci, pp.850–858
Dutta G, Devi A (2013) Plant diversity, population structure, and regeneration status in disturbed tropical forests in Assam, northeast India. J Forestry Res 24(4):715–720. https://doi.org/10.1007/s11676-013-0409-y
Ellenberg D, Mueller-Dombois D (1974) Aims and methods of vegetation ecology. Wiley, New York, p 547
Gachhadar PK, Mandal TN, Baniya CB (2023) Forest structure and biodiversity patterns along elevational gradients in Eastern Nepal. Sci World 16(16):106–127. https://doi.org/10.3126/sw.v16i16.57298
Gangopadhyay SK, Bhattacharyya T (2022) Mollisols of Sikkim: the unique soils of the humid temperate zone of India. Clay Res 41(1):13–35. https://doi.org/10.5958/0974-4509.2022.00002.X
Giorgini D, Giordani P, Casazza G, Amici V, Mariotti MG, Chiarucci A (2015) Woody species diversity as predictor of vascular plant species diversity in forest ecosystems. For Ecol Manag 345:50–55. https://doi.org/10.1016/j.foreco.2015.02.016
Gogoi A, Sahoo UK (2018) Impact of anthropogenic disturbance on species diversity and vegetation structure of a lowland tropical rainforest of eastern Himalaya, India. J Mt Sci 15(11):2453–2465
Gogoi A, Sahoo UK, Saikia H (2020) Vegetation and ecosystem carbon recovery following shifting cultivation in Mizoram-Manipur-Kachin rainforest ecoregion, South Asia. Ecol Process 9:1–13
Gogoi A, Sahoo UK, Ahirwal J (2022) Evaluation of ecosystem carbon storage in major forest types of eastern Hmalaya: implications for carbon sink management. J Environ Manage 302:113972
Gogoi R, Sherpa N, Benjamin F, Agrawala JH, Rai DK, S.K., Dash SS (2021) Flora of Sikkim - A Pictorial Guide. Botanical Survey of India, Kolkata and Forest & Environment Department, Sikkim, p 566
Gupta B, Jose MM, Aggarwal S, Ranjan O (2024) A comprehensive analysis of long-term trends in temperature and rainfall patterns in Sikkim, India. J Clim Change 10(4):1–8
Hynniewta TM, Chhetri G (2013) A checklist of dicot flora of Maenam Wildlife Sanctuary and its adjacent areas, South Sikkim, India. Pleione 7(2):376–400
Jha V, Sharma R (2022) Formation of polymetallic ores in the metasedimentary rocks of Rangpo area, Sikkim Lesser Himalaya, India: mineralogical and geochemical attributes. Geol J 57(12):5061–5082
Kakkar A, Rai PK, Mishra VN, Singh P (2022) Decadal trend analysis of rainfall patterns of past 115 years & its impact on Sikkim, India. Remote Sens Applications: Soc Environ 26:100738
Khaine I, Woo SY, Kang H, Kwak M, Je SM, You H, Lee T, Jang J, Lee HK, Lee E, Yang L (2017) Species diversity, stand structure, and species distribution across a precipitation gradient in tropical forests in Myanmar. Forests 8(8):282. https://doi.org/10.3390/f8080282
Kumar A, Marcot BG, Saxena A (2006) Tree species diversity and distribution patterns in tropical forests of Garo Hills. Curr Sci, pp.1370–1381
Lalfakawma; Sahoo UK, Roy S, Vanlalhriatpuia K, Vanlalhluna PC (2009) Community composition and tree population structure in undisturbed and disturbed tropical semi-evergreen forest stands of North-East India. Appl Ecol Environ Res 7(4):303–318
Laing RS, Ong KH, Kueh RJH, Mang NG, King PJH, Sait M (2019) Stand structure, floristic composition and species diversity along altitudinal gradients of a bornean mountain range 30 years after selective logging. J Mt Sci 16(6):1419–1434. https://doi.org/10.1007/s11629-018-5219-4
Lewis SL, Lloyd J, Sitch S, Mitchard ET, Laurance WF (2009) Changing ecology of tropical forests: evidence and drivers. Annu Rev Ecol Evol Syst 40:529–549. https://doi.org/10.1146/annurev.ecolsys.39.110707.173345
Lilabati L, Sahoo UK, Thangjam U (2018) Floristic composition and regeneration status of Emblica officinalis Gaertn. In two semi-evergreen forest stands of Manipur, India. J Experimental Biology Agricultural Sci 6(3):563–571. https://doi.org/10.18006/20186(3)563571
Margalef DR (1975) Information theory in ecology Mem. Real Acad ciencias y artes de Barcelona 32:374–559. https://cir.nii.ac.jp/crid/1571980074889553536
Misra R (1968) Ecology workbook. Scientific
Mohandass D, Hughes AC, Mackay B, Davidar P, Chhabra T (2016) Floristic species composition and structure of a mid-elevation tropical montane evergreen forests (sholas) of the western ghats, southern India. Trop Ecol 57(3):533–543
Musa FI, Sahoo UK (2023) Role of sustainable forest management in poverty reduction and livelihood improvement in Sudan: a review. Int J Ecol Env Sci 49:449–456
Myers N (1988) Threatened biotas: hot spots in tropical forests. Environmentalist 8(3):187–208. https://doi.org/10.1007/BF02240252
Naidu MT, Kumar OA (2016) Tree diversity, stand structure, and community composition of tropical forests in Eastern Ghats of Andhra Pradesh, India. J Asia-Pacific Biodivers 9(3):328–334. https://doi.org/10.1016/j.japb.2016.03.019
Nayak S, Sahoo UK (2020) Tree diversity and ecological status of Madhuca latifolia (Roxb.) JF Macbr in forests of Odisha. Ind J Ecol 47(1):138–149
Nepali BR, Skartveit J, Baniya CB (2021) Impacts of slope aspects on altitudinal species richness and species composition of Narapani-Masina landscape, Arghakhanchi, West Nepal. J Asia-Pacific Biodivers 14(3):415–424. https://doi.org/10.1016/j.japb.2021.04.005
Padalia H, Chauhan N, Porwal MC, Roy PS (2004) Phytosociological observations on tree species diversity of Andaman Islands, India. Curr Sci, pp.799–806
Pandey KP, Adhikari YP, Weber M (2016) Structure, composition and diversity of forest along the altitudinal gradient in the Himalayas, Nepal. Appl Ecol Environ Res 14(2):235–251. https://doi.org/10.15666/aeer/1402_235251
Pao NT, Upadhaya K (2017) Effect of fragmentation and anthropogenic disturbances on floristic composition and structure of subtropical broad leaved humid forest in Meghalaya, Northeast India. Appl Ecol Environ Res 15(385):e407. https://doi.org/10.15666/aeer/1504_385407n
Parthasarathy N (2001) Changes in forest composition and structure in three sites of tropical evergreen forest around Sengaltheri, Western Ghats. Current science, pp.389–393
Pettorelli N, Graham NA, Seddon N, Maria da, Cunha Bustamante M, Lowton MJ, Sutherland WJ, Koldewey HJ, Prentice HC, Barlow J (2021) Time to integrate global climate change and biodiversity science-policy agendas. Journal of Applied Ecology, 58(11), pp.2384–2393
Pielou EC (1975) Ecological diversity. https://cir.nii.ac.jp/crid/1130000795048897920
Rahbek C (1995) The elevational gradient of species richness: a uniform pattern? Ecography 18(2):200–205
Rai P (2018) Common Flora of South Sikkim: a glance to ethnicity and diversity of common flora of South Sikkim. Notion
Rees SE, Foster NL, Langmead O, Pittman S, Johnson DE (2018) Defining the qualitative elements of Aichi Biodiversity Target 11 with regard to the marine and coastal environment in order to strengthen global efforts for marine biodiversity conservation outlined in the United Nations sustainable development goal 14, vol 93. Marine Policy, pp 241–250
Saha S, Rajwar GS, Kumar M (2016) Forest structure, diversity and regeneration potential along altitudinal gradient in Dhanaulti of Garhwal Himalaya. For Syst 25(2):e058–e058
Sahoo UK, Lalfakawma (2010) Population dynamics of Schima Wallichii in an undisturbed vs disturbed forest stands of northeast India. Int J Ecol Env Sci 36:157–165
Sahoo UK, Lalfakawma (2013) Population dynamics of Castanopsis tribuloides A.(DC) in an undisturbed and disturbed tropical forest stands of northeast India. J Exp Biol Agric Sci 1(6):454–463
Sahoo UK, Singh SL, Gogoi A, Kenye A, Sahoo SS (2019) Active and passive soil organic carbon pools as affected by different land use types in Mizoram, northeast India. PLoS ONE, 14(7), e0219969
Shaheen H, Ullah Z, Khan SM, Harper DM (2012) Species composition and community structure of western himalayan moist temperate forests in Kashmir. For Ecol Manag 278:138–145. https://doi.org/10.1016/j.foreco.2012.05.009
Shankar U, Tripathi AK (2017) Rainforests north of the Tropic of Cancer: physiognomy, floristics and diversity in ‘lowland rainforests’ of Meghalaya, India. Plant Divers 39(1):20–36. https://doi.org/10.1016/j.pld.2016.10.003
Shannon CE, Wiener W (1963) The Mathematical Theory of Communication. University of Illinois Presss, Urbana, IL, p 127
Sharma N, Behera MD, Das AP, Panda RM (2019) Plant richness pattern in an elevation gradient in the Eastern Himalaya. Biodivers Conserv 28:2085–2104. https://doi.org/10.1007/s10531-019-01699-7
Sharma RK, Shrestha DG (2016) Climate perceptions of local communities validated through scientific signals in Sikkim Himalaya, India, vol 188. Environmental monitoring and assessment, pp 1–11
Simpson EH (1949) Measurement of diversity. Nature 163(4148):688–688. https://doi.org/10.1038/163688a0
Singh A, Kumar MR, Raju PS (2007) Mantle deformation in Sikkim and adjoining Himalaya: Evidences for a complex flow pattern. Phys Earth Planet Inter 164(3–4):232–241
Singh SP, Gumber S (2018) Climate change in Himalayas: research findings and complexities. International Journal of Plant and Environment, 4(01)
Subba S, Gurung K, Subba S, Nepal S (2020) Quantitative analysis of vegetation structure, composition and species diversity of moist Sal bearing tropical forest of Sumbuk reserve forest in South Sikkim, India. Trop Plant Res 7(1):245–254. https://doi.org/10.22271/tpr.2020.v7.i1.030
Tenzin J, Hasenauer H (2016) Tree species composition and diversity in relation to anthropogenic disturbances in broad-leaved forests of Bhutan. Int J Biodivers Sci Ecosyst Serv Manage 12(4):274–290. https://doi.org/10.1080/21513732.2016.1206038
Thakur U, Bisth NS, Kumar A, Kumar M, Sahoo UK (2021) Regeneration potential of forest vegetation of Churdhar Wildlife Sanctuar of India: Implicaton for forest management. Water Air Soil Pollut 232:373. https://doi.org/10.1007/s11270-021-05315-9
Thorne JH, Choe H, Dorji L, Yangden K, Wangdi D, Phuntsho Y, Beardsley K (2022) Species richness and turnover patterns for tropical and temperate plants on the elevation gradient of the eastern Himalayan Mountains. Front Ecol Evol 10:942759. https://doi.org/10.3389/fevo.2022.942759
Yam G, Tripathi OP (2016) Tree diversity and community characteristics in Talle Wildlife Sanctuary, Arunachal Pradesh, Eastern Himalaya, India. J Asia-Pacific Biodivers 9(2):160–165. https://doi.org/10.1016/j.japb.2016.03.002
Author Information
Department of Forestry, Mizoram University, Aizawl, India