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Testing the REVEALS model in South-East India - reconstruction of Holocene regional land-cover change

Abstract : Pollen-based quantitative reconstruction of regional land cover is an essential step to infer past landscape dynamics and to produce vegetation descriptions useful in Earth-system modelling. In this study, we test the REVEALS (Regional Estimates of VEgetation Abundance from Large Sites) model (Sugita, 2007a) for the first time tropical south east India to reconstruct Holocene regional land-cover change. We use three fossil pollen records from the Coromandel coast, falling in the rain shadow of the southwest or summer monsoon and characterized by Tropical Dry Evergreen Forests (TDEFs). One of the pollen records is from a site located in the same region as sites used to estimate Relative Pollen Productivity (RPP) needed for the application of the REVEALS model. The two other pollen records are from the same biogeographic zone, ~150 km south of the primary site. The REVEALS reconstructions are achieved for consecutive 500-year time windows up to 0.7 ka BP and time windows of decreasing length up to present following the protocol of PAGES LandCover6k (Gaillard et al. 2018). In addition to RPPs estimated for six key taxa of SE India, Poaceae, Acacia/Albizia, Dodonaea, Justicia, Melastomataceae/Combretaceae, and Randia, we applied RPPs from China (Li, et al., 2017) for Aster/Anthemis-t. (known as Compositae Echinate in India), Amaranthaceae/Chenopodiaceae, and Cyperaceae, assuming that RPPs in temperate China and SE India are comparable. The REVEALS reconstructions suggest that, except for Cyperaceae, all other taxa are over-represented in the pollen record. Fluctuations in the quantitative estimates of key pollen markers of the TDEF vegetation through time indicate that the present mosaic vegetation of the region may have existed for a long time, and that the land cover of SE India was a scrubland with grasses and patches of TDEFs through most of the Holocene.
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Submitted on : Thursday, January 16, 2020 - 1:04:44 PM
Last modification on : Wednesday, October 14, 2020 - 3:49:23 AM

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  • HAL Id : hal-02442200, version 1

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Navya Reghu, S Prasad, M.J. Gaillard, Florence Mazier, P.P. Mohapatra, et al.. Testing the REVEALS model in South-East India - reconstruction of Holocene regional land-cover change. 20th INQUA, Jul 2019, Dublin, Ireland. ⟨hal-02442200⟩

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