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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Late Pleistocene-Holocene vegetation and climate change in the Central Ganga Plain: a multiproxy study from Jalesar Tal, Unnao District, Uttar Pradesh
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Late Pleistocene-Holocene vegetation and climate change in the Central Ganga Plain: a multiproxy study from Jalesar Tal, Unnao District, Uttar Pradesh

机译：中部恒河平原的晚更新世-全新世植被和气候变化：北方邦Unnao区Jalesar Tal的多代理研究

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摘要

Pollen and organic–inorganic carbon analyses of a 2.8 m deep sediment profile from Jalesar Tal, Unnao District, Uttar Pradesh reveal that just prior to and between 42,490 and 13,560 cal yrs BP, this region supported grassland vegetation largely comprising grasses with scanty trees of Syzygium and Prosopis under a cool and dry climate. The coarser sand sediments deposited from 13,560 to 5,260 cal yrs BP are palynologically barren and may be linked to the upwarping phase of the Ganga Plain, resulting into rapid reworking of the sediments, including calcrete formation. Between 5,260 and 4,760 cal yrs BP with the invasion of more trees, viz. Holoptelea, Acacia, Bombax ceiba, Aegle marmelos, etc. groves of forest interspersed with grassland got established due to amelioration of climate. Interestingly, the appearance of Cerealia pollen denotes the initiation of cereal-based agricultural practice in the region. Around 4,760 to 3,200 cal yrs BP, the invasion of a large number of trees, viz. Madhuca indica, Emblica officinalis, Sterculia and Adina cordifolia, besides those existing earlier coupled with high organic carbon values implies that the forest groves became diversified with the onset of a warm and humid climate in response to active SW monsoon. The rising trend of Cerealia pollen reflects the acceleration of agricultural practice in the region. Between 3,200 and 1,200 cal yrs BP, the forest groves turned sparse owing to reduced monsoon precipitation leading to prevalence of a less humid climate in the region. Since 1,200 cal yrs BP, the further diminishing trend of arboreals and aquatic plants signifies decline in rainfall witnessing a warm and dry climate.
机译：对北方邦Unnao区Jalesar Tal 2.8 m深沉积物剖面的花粉和有机无机碳分析显示，在BP年龄在42,490到13,560 yrs BP之前和之间，该地区支持的草原植被主要包括草和矮小的Syzygium和Prosopis在凉爽干燥的气候下。从BP的13,560到5,260 cal yr沉积的较粗的沙沉积物在孢粉学上是贫瘠的，并且可能与恒河平原的翘曲期有关，从而导致沉积物的快速修复，包括形成凝结层。 BP在5,260到4,760 cal年之间​​，入侵了更多树木。由于气候的改善，建立起了全片，相思树，木棉树，木乃伊等，林间布满了草原。有趣的是，Cerealia花粉的出现表明该地区开始了以谷物为基础的农业实践。 BP大约4,760至3200 cal yrs，入侵了大量树木。印度洋的马杜卡，印度洋的Emblica officinalis，Sterculia和Adina cordifolia，以及较早存在的那些，再加上高的有机碳值，意味着随着西南季风的活跃，随着温暖湿润的气候，森林开始变得多样化。 Cerealia花粉的上升趋势反映了该地区农业实践的加速发展。在3200到1200 yr BP之间，由于季风降水减少导致该地区普遍存在较湿润的气候，树林逐渐稀疏。自1200年BP以来，树木和水生植物的进一步减少趋势表明降雨减少，见证了温暖干燥的气候。

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