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首页> 外文期刊>Journal of Asian earth sciences >Holocene vegetation and climatic variations in Central India: A study based on multiproxy evidences
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Holocene vegetation and climatic variations in Central India: A study based on multiproxy evidences

机译：印度中部全新世植被与气候变化：基于多重代理证据的研究

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Palynology, texture, mineralogy, geochemistry, and magnetic susceptibility analysis of a 2 m deep sediment core from Padauna Swamp, southeastern Madhya Pradesh infers that between 8600 and 7500 cal yr BP a warm and relatively less-humid climate prevailed with open tree-savannahs dominated by grasses followed by sedges, Artemisia and members of Chenopodiaceae/Amaranthaceae with scanty trees viz., Schrebera, Aegle marmelos and Sterculia urens. This is well supported by lower organic to carbonate carbon ratio, coarser texture having relatively low CIA and magnetic susceptibility values and presence of some primary minerals. Between 7500 and 6250 cal yr BP the tree-savannahs were succeeded by open mixed deciduous forests with the invasion of a few more trees viz., Madhuca indica, Holoptelea, Emblica officinalis, Mitragyna parvifolia and members of Anacardiaceae in response to onset of a warm and humid climate. A considerable rise in organic carbon generated from the degradation of plentiful biomass along with increase in clay content with signs of kaolinite and increase in immobile over mobile elements with slightly higher CIA and magnetic susceptibility values also suggest climatic amelioration. The presence of ruderal plants such as Artemisia, Cannabis sativa and Cheno/Am further infers initiation of human activities in the region. Between 6250 and 2800 cal yr BP, the mixed deciduous forests became more diverse and dense, subduing grasses and other herbaceous elements. Sporadic incursion of Shorea robusta (Sal) in forest floristic was recorded around 5000 cal yr BP. The overall change in the vegetation mosaic reflects that a warm and more-humid climate prevailed in the region, probably on account of invigoration of southwest monsoon. This observation is further corroborated by other proxy data showing a spurt in organic/inorganic carbon ratio, increase in clay content with matured mineralogy, significantly higher CIA and magnetic susceptibility values. Since 2800 cal yr BP onwards, the modern Sal dominated deciduous forests were established indicating continuation of warm and more-humid climate including timely arrival of SW monsoon coinciding with the shedding of Sal seeds as they are viable for a very short period.
机译：对中央邦东南部的Padauna沼泽深2 m的沉积岩心进行的孢粉学，质地，矿物学，地球化学和磁化率分析表明，在BP年龄8600至7500 BP之间，温暖和相对湿度较低的气候占主导地位，而开阔的树稀树草原为主导依次是草，莎草，蒿和藜科（Chenopodiaceae）/ A菜科（Amaranthaceae）的成员，树木稀少，有Schrebera，Aegle marmelos和Sterculia urens。较低的有机碳比与碳比，具有相对较低的CIA和磁化率值以及某些主要矿物质的较低质感得到了很好的支持。在7500年至6250年BP之间，树木稀树草原被开阔的混合落叶林继承，并入侵了另外几棵树，如疯树，疯树，Emblica officinalis，Mitragyna parvifolia和Anacardiaceae成员，以应对温暖的天气和潮湿的气候。大量生物质降解所产生的有机碳显着增加，以及粘土含量的增加和高岭石的出现以及固定元素的移动性增加，以及具有较高CIA和磁化率的移动元素也表明气候有所改善。 Art蒿，大麻和奇诺/ Am等蒲植物的存在进一步推断该地区人类活动的开始。在6250到2800 cal BP年之间，落叶的混交林变得更加多样化和茂密，草丛和其他草本元素变得柔和。大约在5,000 cal yr BP时记录到森林植物区系的浓香树（Sala）的零星入侵。植被马赛克的总体变化反映出该地区盛行温暖和潮湿的气候，这可能是由于西南季风的活跃。其他代理数据进一步证实了这一观察结果，这些数据显示有机碳/无机碳比突增，矿物学成熟后粘土含量增加，CIA显着提高和磁化率值。自从2800年BP开始，建立了以Sal为主的现代落叶林，这表明继续温暖和潮湿的气候，包括西南季风的及时到来与Sal种子的脱落相吻合，因为它们在很短的时间内就可以生存。

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