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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >LATE QUATERNARY VEGETATIONAL AND CLIMATIC CHANGES FROM TROPICAL PEATS IN SOUTHERN INDIA - AN EXTENDED RECORD UP TO 40,000 YEARS BP
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LATE QUATERNARY VEGETATIONAL AND CLIMATIC CHANGES FROM TROPICAL PEATS IN SOUTHERN INDIA - AN EXTENDED RECORD UP TO 40,000 YEARS BP

机译：印度南部热带泥炭的晚第四纪植被和气候变化-长达40,000年的扩展记录BP

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摘要

Stable carbon isotope ratios of peats dated (by C-14) back to 40 kyr BP from the montane region (> 1800 m asl) of the Nilgiris, southern India, reflect changes in the relative proportions of C3 and C4 plant types, which are influenced by soil moisture (and hence monsoonal precipitation), From prior to 40 kyr BP until 28 kyr BP, a general decline in delta(13)C values from about - 14 per mil to - 19 per mil suggests increased dominance of C3 plants concurrent with increasingly moist conditions, During 28-18 kyr BP there seems relatively little change with delta(13) C of - 19 to - 18 per mil, At about 16 kyr BP a sharp reversal in delta(13)C to a peak of - 14.7 per mil indicates a clear predominance of C4 vegetation associated with arid conditions, possibly during or just after the Last Glacial Maximum, A moist phase at about 9 kyr BP (the Holocene Optimum) with dominance of C3 vegetation type is observed, while arid conditions are re-established during 5-2 kyr BP with an overall dominance of C4 vegetation, New data do not support the occurrence of a moist phase coinciding with the Mediaeval Warm Period (at 0.6 kyr BP) as suggested earlier, Overall, the climate and vegetation in the high altitude regions of the southern Indian tropics seem to have responded to past global climatic changes, and this is consistent with other evidences from India and other tropical regions. [References: 36]
机译：从印度南部尼古里斯的山地地区（> 1800 m asl）追溯到（40年前）BP的泥炭的稳定碳同位素比（按C-14）反映了C3和C4植物类型相对比例的变化受土壤水分（进而季风性降水）的影响，从40年前的BP到28年前的BP，δ（13）C值从大约-14 / mil下降到-19 / mil普遍下降表明同时C3植物的优势增加随着越来越潮湿的条件，在28-18 yr BP期间，del（（13）C）的变化相对较小，为-19至-18 / mil。在大约16 yr BP时，delta（13）C急剧反转为-每密耳14.7表示与干旱条件相关的C4植被明显占优势，可能是在上一次冰期最大值期间或之后。在干旱条件下，观察到大约Cyr植被类型占主导地位的大约9 kyr BP的湿相（全新世最佳）。在5-2岁的BP期间重新建立，总体优势C4植被的e，新数据不支持与早前建议的中世纪暖期（0.6 yr BP）相吻合的湿相的发生。总体而言，印度南部热带高海拔地区的气候和植被似乎对过去的全球气候变化做出了反应，这与印度和其他热带地区的其他证据是一致的。 [参考：36]

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