Palaeovegetation and climate oscillation of western Odisha, India: A pollen data-based synthesis for the Mid-Late Holocene

Tripathi, Swati; Basumatary, Sadhan K.; Singh, Varsha; Bera, S. K.; Nautiyal, C. M.; Thakur, Biswajeet

doi:10.1016/j.quaint.2013.12.005

Cited by 22 publications

(19 citation statements)

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“…Coincidently, the phytolith proxies in this paper reveal that precipitation in the study region was higher than 700 mm at this time, and occasionally exceeded 900 mm. Similar to the above findings, a pollen‐based vegetation reconstruction indicated that the thermophilous and hygrophilous taxa Madhuca , Rhizophora and Juglans expanded significantly and became dominant during ~8,000 ~ 5,000 calyr BP in the GST region (Tripathi, Basumatary, & Singh, 2014). Stalagmite records from Yelang Cave in Guizhou province and Shanbao Cave suggest that δ 18 O values were low and that the growth rate of stalagmites increased, which is interpreted as a signal of climatic warming (Shao et al, 2006; Zhao, Li, & Liu, 2015).…”

Section: Discussionsupporting

confidence: 72%

An evaluation of soil phytoliths for reconstructing plant communities and palaeoclimate in the northern temperate region

Liu

Jie

Liu

et al. 2020

European J Soil Science

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Phytoliths can act as efficient carriers of information about palaeovegetation and palaeoclimatic conditions, but the representativeness of soil phytoliths from palaeoecological sediments has not been fully understood. In this study, phytolith assemblages in topsoils and associated plant communities at 55 sites in Northeast China were compared. The results indicate that samples from herbaceous and woody communities could be reliably differentiated by topsoil phytoliths. Notably, different phytolith types exhibit varying degrees of representational bias in terms of the aboveground plant community. Some morphotypes (e.g., bilobate, rondel and lanceolate) over‐represent the richness of the corresponding plant; some morphotypes, including microhair, conical epidermal, silicified stomata and epidermal phytoliths, under‐represent the parent plant abundance; additional morphotypes (e.g., elongate, saddle and trapeziform sinuate) are consistent with the changes of associated plants. Based on the representational bias, we calibrated the percentages of topsoil phytoliths and established a phytolith‐based transfer function for precipitation in Northeast China. A palaeoclimate reconstruction in the Changbai Mountains (in the eastern part of Northeast China) based on the above phytolith‐based transfer function for precipitation shows that the region has gone through continuous climatic changes since the late glacial period: from cold and dry conditions to warm and dry conditions, then to warm and wet conditions, and finally to cool and dry conditions. The phytolith‐based reconstructed climate changes since the late glacial period correspond well to those reconstructed by other records from the same stratigraphic profile, and our phytolith‐based climatic reconstruction also confirms the reliability of abrupt cold climatic shifts at 8.2, 6.8, 5.6, 4.6 and 4.2 ka. In conclusion, our results provide the basis for the reliability of phytoliths for reconstructing climatic changes in the northern temperate region. Highlights Calibrating soil phytolith assemblages for any quantitative palaeovegetation reconstruction using phytoliths is necessary. Phytolith morphotypes in topsoils may over‐ or under‐represent or agree with the abundance of modern plant taxa. Phytolith‐based climatic reconstruction corresponds well with the abrupt climate changes evident since the Late Glacial period and other proxy records.

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Section: Discussionsupporting

confidence: 72%

An evaluation of soil phytoliths for reconstructing plant communities and palaeoclimate in the northern temperate region

Liu

Jie

Liu

et al. 2020

European J Soil Science

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“…Corylus, Pinus and Quercus, is indicative of long-distance water transport from high altitudes, as well as high wind activity (Tripathi et al 2014). The occurrence of fungal remains is suggestive of a humid depositional environment during sedimentation.…”

Section: Discussionmentioning

confidence: 99%

Modern pollen and its ecological relationships with the tropical deciduous forests of central Uttar Pradesh, India

Tripathi¹,

Arya

Basumatary³

et al. 2015

Palynology

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“…The sedimentary sequence near the rivers has been studied to decipher the ISM variability such as a trenched section near the Mahanadi River, Odisha showed an ISM strengthening between 5840 and 4380 yr BP. An increased humidity noticed during 4380−3230 and 1860−1300 yr BP was interrupted by the warm but less humid period and after 1300 yr BP warm and dry climate continued to experience in the region (Tripathi et al, 2014). The sediment core retrieved from the continental shelf of the eastern Indian coast near Rushikulya River demonstrated ISM strengthening as indicated by improved surface water runoff during 6800−3100 cal.…”

Section: Holocene Climate Variability: Marine and Continental Recordsmentioning

confidence: 99%

Holocene climate variability and Indian Summer Monsoon: An overview

2020

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The response of the Indian Summer Monsoon (ISM) to forcing factors and climate variables has not yet fully explored, even though the ISM plays a pivotal role in the socio-economics of the Indian subcontinent and nearby areas. The ISM progression over Indian landmass is a manifestation of the Intertropical Convergence Zone (ITCZ) migration over the northern Indian Ocean and the Indian subcontinent. The recent anomalous behaviour of ISM raises the need for a better understanding of its spatio-temporal changes during the ongoing interglacial period termed as the Holocene period. The Holocene period has been classified further based on the globally observed abrupt climatic events at 8.2 and 4.2 ka. The 8.2 ka global cooling events have been recorded from northern Indian Ocean marine archives but limited records from the continental archives of the Indian landmass has demonstrated the 8.2 ka event. At the same time, the 4.2 ka dry climate has been endorsed by both marine as well as continental records and agrees with the global studies. During the ‘Little Ice Age’ (LIA), in the India subcontinent, wet conditions prevailed in the northern, central and western regions while a dry climate existed over the greater part of peninsular India. The present review offers an account of ISM signatures and possible mechanisms associated with the monsoon variability in the Indian subcontinent and the northern Indian Ocean during the Holocene period.

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Palaeovegetation and climate oscillation of western Odisha, India: A pollen data-based synthesis for the Mid-Late Holocene

Cited by 22 publications

References 50 publications

An evaluation of soil phytoliths for reconstructing plant communities and palaeoclimate in the northern temperate region

An evaluation of soil phytoliths for reconstructing plant communities and palaeoclimate in the northern temperate region

Modern pollen and its ecological relationships with the tropical deciduous forests of central Uttar Pradesh, India

Holocene climate variability and Indian Summer Monsoon: An overview

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