干旱区生态环境知识资源中心(Arid): Human impact on low-land Vellayani Lake, south India: A record since 3000 yrs BP

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DOI	10.1016/j.ancene.2015.04.001
	Human impact on low-land Vellayani Lake, south India: A record since 3000 yrs BP
	Veena, M. P.; Achyuthan, Hema; Eastoe, Chris; Farooqui, Anjum
通讯作者	Achyuthan, H
来源期刊	ANTHROPOCENE
ISSN	2213-3054
出版年	2014
卷号	8 页码:83-91
英文摘要	Humans have continuously changed the landscape and vegetation cover of the earth, including deserts and lake margins. Vellayani Lake, Kerala, is being severely affected by human activity in the catchment basin. Population increase, leading to increased demand for agricultural land and water, is driving a positive feedback loop resulting in the accelerating siltation of the lake and lowering of water levels. A 145 cm sediment core represents deposition since 3000 yrs BP, but at least half of the sediment has been deposited since 1650 AD, possibly since 1950 AD. The sediment stratigraphy is disturbed, most likely by slumping since 1970, of an unstable sediment accumulation near the lake margin. The disturbance precludes detailed interpretation of paleoenvironmental proxies, textural variation, chemical weathering index, pollen and phytolith assemblages. The proxies provide evidence of drier climate up to 3000 yrs BP, and wetter conditions at about 1210 yrs BP. Low frequency of phytoliths morph types indicates reduction in vegetation cover and a significant increase in grassland since 2300 yrs BP due to climate warming, weakened southwest monsoon, deforestation reclamation of the lake margins for intensive agricultural practices. Occurrence of diatoms and sponge spicules indicate shallowing of the lake from 2300 yrs BP onwards. Occurrence of charcoal pieces post 3000 yrs BP represents human impact. Integration of all the results show that the Vellayani Lake has contracted because of a weakened Indian southwest monsoon since 3000 yrs BP, intense human impact in the form of deforestation, irrigation and agricultural practices. (c) 2015 Elsevier Ltd. All rights reserved.
英文关键词	Lake sediments Radiocarbon dates Phytoliths and pollen data Lake margins Weakened southwest monsoon Human impact
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000217931100008
WOS类目	Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography ; Geology
来源机构	University of Arizona
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/330766
作者单位	[Veena, M. P.; Achyuthan, Hema] Anna Univ, Dept Geol, Chennai 600025, Tamil Nadu, India; [Eastoe, Chris] Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA; [Farooqui, Anjum] Birbal Sahni Inst Paleobotany, Lucknow 226007, Uttar Pradesh, India
推荐引用方式 GB/T 7714	Veena, M. P.,Achyuthan, Hema,Eastoe, Chris,et al. Human impact on low-land Vellayani Lake, south India: A record since 3000 yrs BP[J]. University of Arizona,2014,8:83-91.
APA	Veena, M. P.,Achyuthan, Hema,Eastoe, Chris,&Farooqui, Anjum.(2014).Human impact on low-land Vellayani Lake, south India: A record since 3000 yrs BP.ANTHROPOCENE,8,83-91.
MLA	Veena, M. P.,et al."Human impact on low-land Vellayani Lake, south India: A record since 3000 yrs BP".ANTHROPOCENE 8(2014):83-91.