Studies on pollen deposition pattern in relation to modern vegetation of flood prone region in Assam, India

Sadhan Kumar Basumatary

doi:10.54991/jop.2017.283

Authors

Sadhan Kumar Basumatary Birbal Sahni Institute of Palaeosciences, 53 University Road, Lucknow 226007, India

DOI:

https://doi.org/10.54991/jop.2017.283

Keywords:

Assam, Flood prone area, Modern pollen deposition, Palaeoecological reconstruction, Palaeoflood episodes, Pollen clumps

Abstract

This paper presents a palynological dataset on Pashumara Wetland and Ranga Reserve Forest to differentiate flooded and non–flooded area in relation to existing vegetation in Assam. Study reveals that the palynoassemblage in Pashumara Wetland is an admixture of arboreal local and extra–local taxa and not fully matches with present vegetation. The various pollen distributions were observed in continuation to study sites and confirmed that pollen deposition pattern in wetland depends on parent plant growth, flood activity and surrounding vegetation. Presence of broken pollen is indicative of long distance transportation under a fluvial environment. The palynoassemblage of Ranga Reserve Forest located in non–flooded area to display modern pollen and vegetation relationship and identification of local arboreal taxa in the region. The main forest elements include Syzigium, Lagerstroemia and Emblica in the palynoassemblage are suggestive of presence of tropical deciduous forest under warm and humid climate. Pollen clumps in the palynoassemblage signifies their local origin and entomophily. This generated palynodata could be precisely utilized to distinguish flooded and non–flooded area and to interpret palaeovegetation and past climate changes in relation to palaeoflood episodes by the analysis of wetland core from the region and to correlate other tropical flood prone region of the globe.

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References

Basumatary SK & Bera SK 2007. Modern pollen–spore assemblage from sediments of tropical moist deciduous forest, East Garo Hills, Meghalaya. Journal of Palynology 43: 111–118.

Basumatary SK, Bera SK, Sangma SN & Marak G 2014. Modern pollen deposition in relation to vegetation and climate of Balpakram Valley, Meghalaya, northeast India: Implications for Indo–Burma palaeoecological contexts. Quaternary International 325: 30–40.

Basumatary SK, Dixit Swati, Bera SK & Mehrotra RC 2013. Modern pollen assemblages of surface samples from Cherrapunjee and its adjoining areas, Meghalaya, northeast India. Quaternary International 298: 68–79.

Bent AM & Wright HE Jr 1963. Pollen analyses of surface materials and lake sediments from the Chiska Mountains, New Mexico. Bulletin of Geological Society of America 74: 491–500.

Bera SK 2000. Modern pollen deposition in Mikir Hills, Assam. The Palaeobotanist 49: 325–328.

Bera SK, Basumatary SK & Dixit Swati 2009. Studies on pollen morphology and phenological characteristics of some economically important arborescent taxa of Tropical forest lower Brahmaputra Valley, Assam, North East India. Journal of Palynology 43: 1–9.

Bera SK, Basumatary SK, Gogoi B & Narzary D 2012. Pollen rain pattern in Gibbon Wildlife Sanctuary, Assam, India. Journal of Frontline Research in Arts and Science 2: 79–87.

Bera SK, Basumatary SK & Gogoi R 2014. Evidence of deterioration in phytodiversity of Itanagar Wildlife Sanctuary, Arunachal Pradesh, India based on palynological evidence. The Palaeobotanist 63: 33–40.

Birks HJB & Seppa H 2004. Pollen–based reconstructions of late–Quaternary climate in Europe—progress, problems, and pitfalls. Acta Palaeobotanica 44: 317–334.

Borstrom A, Nielsen AB, Gaillard MJ, Hjelle K, Mazier F, Binney H, Bunting J, Fyfe R, Meltsov V, Poska A, Rasanen S, Soepboer W, Stedingk H, Suutari H & Sugita S 2008. Pollen productivity estimates of key European plant taxa for quantitative reconstruction of past vegetation: A review. Vegetation History and Archaeobotany 17: 461–478.

Bunting MJ, Gaillard MJ, Sugita S, Middleton R & Brostrom A 2004. Vegetation structure and pollen source area. The Holocene 14(5): 651–660.

Chauhan MS & Bera SK 1990. Pollen morphology of some important plants of tropical deciduous sal (Shorea robusta) forests, District Sidhi, Madhya Pradesh. Geophytology 20(1): 30–36.

Davies MB, Brubaker LB & Beliswenger JM 1971. Pollen grain in lake sediments: pollen percentages in surface sediments from Southern Michigan. Quaternary Research 1: 450–467.

Dixit Swati & Bera SK 2012. Pollen rain studies in wetland environ of Assam, Northeast India, to interpret present and past vegetation. International Journal of Earth Sciences and Engineering 5(4): 739–747.

Faegri K & Van Der Pijl 1966. The principles of pollination ecology. Pergamon Press, Oxford, UK.

Erdtman G 1953. An introduction to Pollen analysis. Waltham, Mass; USA.

Gosling WD, Mayle FE, Tate NJ & Killeen TJ 2009. Differentiation between Neotropical rainforest, dry forest, and savannah ecosystems by their modern pollen spectra and implications for the fossil pollen record. Review of Palaeobotany and Palynology 153: 70–85.

Goswami DC 1985. Brahmaputra River, Assam, India: Physiography, Basin Denudation and Channel Aggradation. Water Resources Research 21: 959–978.

Gupta HP & Sharma C 1985. Pollen analysis of modern sediments from Khasi and Jaintia hills, Meghalaya, India. Journal of Palynology 21: 167–173.

Janssen CR 1967. A comparison between the recent regional pollen rain and the subrecent vegetation in four major vegetation types in Minnesota (U.S.A.). Review of Palaeobotany and Palynology 2: 331–342.

Luly JG 1997. Modern pollen dynamics and surficial sedimentary processes at Lake Tyrrell, semi–arid northwestern Victoria, Australia. Review of Palaeobotany and Palynology 97: 301–318.

Martin MD, Chamecki M, Brush GS, Meneveau C & Parlange MB 2009. Pollen clumping and wind dispersal in an invasive Angiosperm. American Journal of Botany 96(9): 1703–1711.

Nayar TS 1990. Pollen flora of Maharashtra State, India. Today and Tomorrow’s Printers & Publishers, New Delhi, India.

Overpeck JT, Webb III T & Prentice IC 1985. Quantitative interpretation of fossil pollen spectra: dissimilarity coefficients and the method of modern analogs. Quaternary Research 23: 87–108.

Prentice IC 1985. Pollen representation, source area and basin size: toward a unified theory of pollen analysis. Quaternary Research 23: 76–86.

Prentice IC 1987. Quantitative forest–composition sensing characteristics of pollen samples from Swedish lakes. Boreas 16: 43–54.

Sugita S 1993. A model of pollen source area for an entire lake surface. Quaternary Research 39: 239–244.

Wilmshurst JM & McGlone MS 2005. Origin of pollen and spores in surface lake sediments: comparison of modern palynomorph assemblages in moss cushions, surface soils and surface lake sediments. Review of Palaeobotany and Palynology 136: 1–15.

Wright HEJr 1967. The use of surface samples in Quaternary pollen analysis. Review of Palaeobotany and Palynology 2: 321–330.

Xiao X, Ji Shen & Sumin Wang 2011. Spatial variation of modern pollen from surface lake sediments in Yunnan and southwestern Sichuan Province, China. Review of Palaeobotany and Palynology 165: 224–234.

Xu QH, Li YC, Yang XL, Xiao JL, Liang WD & Peng YJ 2005. Source and distribution of pollen in the surface sediment of Daihai Lake, inner Mongolia. Quaternary International 136: 33–45.

Zhao Y, Xu QH, Huang XZ, Guo XL & Tao SC 2009. Differences of modern pollen assemblages from lake sediments and surface soils in arid and semi–arid China and their significance for pollen–based quantitative climate reconstruction. Review of Palaeobotany and Palynology 156: 519–524