山旺中新世植被演替及古气候定量研究

doi:10.7605/gdlxb.2001.03.001

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摘要

本文详细研究了山旺中新世22.95 m厚的硅藻土沉积层位上，以10-30 cm为间距所采集的130块孢粉样品，鉴定出111个孢粉类型；古植被演替的研究结果表明由老至新经历的5个阶段：“湿润环境下的混交中生林”，“干旱环境下的混交中生林”，“湿润湖岸环境下的混交中生林”，“山地、湿润及碱性等环境下的混交中生林”，和“碱性环境下的混交中生林”；同时,首次成功地运用共存分析法定量地恢复了山旺中新世气候，得出古气候参数定量值如下：年平均温度15.6-17.2℃, 最热月平均温度24.7-27.8℃, 最冷月平均温度 5.0-6.6℃, 温度年较差20.5-25℃, 平均相对湿度72-75%, 年平均降雨量1162-1308 mm, 最湿月份平均降雨量148-180 mm, 最干月份平均降雨量16-59 mm, 最干及最湿月份降雨量的差值81-153 mm, 最热月份的平均降雨量108-111 mm。山旺中新世时期的气候波动范围为：年平均温度波动约3℃左右，最冷月份平均温度波动约4℃左右，最热月份平均温度波动约1℃左右，年平均降雨量波动约100 mm左右。总体反映山旺中新世气候温暖潮湿，冬季凉爽，夏季炎热。

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Abstract：

130 closely spaced (10-30cm) pollen samples which were collected from 22.95m Shanwang profile have been studied and are detailed in this paper. 111 pollen and spore taxa, as well as their nearest living relatives have been recognized. The reconstruction of palaeovegetation indicates that the Shanwang Miocene flora was a mixed mesophytic forest. Throughout the studied section, this mixed mesophytic forest experienced "mixed mesophytic forest from wet habitats", "mixed mesophytic forest from dry habitats", "mixed mesophytic forest from wet habitats", "mixed mesophytic forest from upland, riparian and alkaline soils habitats", "mixed misophytic forest from calcareous habitats" five stages. Quantitative palaeoclimatic data has been obtained through using the coexistence approach. The results indicate that the mean annual temperature (MAT) was between 15.6-17.2℃, that the mean temperature of the coldest month (TCM) was between 5.0-6.6℃ and the mean temperature of the warmest month (TWM) was between 24.7-27.8℃. Mean annual precipitation (MAP) has been determined in the range of 1162-1308 mm, with precipitation of the warmest month (PwarmM) being 108-111mm, precipitation in the driest month (PDM) being 16-59 mm and precipitation of 148-180 mm occurring in the wettest month (PwetM). Relative humidity (RH) has been calculated as 72-75 %. This also indicates that there were climatic fluctuations between the high resolution pollen samples. It was up to 3℃ for mean annual temperature, up to 4℃ for temperature of the coldest month, up to 1℃ for temperature of the warmest month, up to 100 mm for mean annual precipitation.

出版日期: 2001-06-01

作者简介: 梁明媚，女， 1970年12月生，中国科学院植物研究所博士生。地址：北京海淀区香山南辛村20号，100093。

引用本文:

. 山旺中新世植被演替及古气候定量研究[J]. 古地理学报, 2001, 3(3): 11-20.

. Palaeovegetation succession and quantitative palaeoclimate reconstruction of the Miocene Shanwang assemblage[J]. JOPC, 2001, 3(3): 11-20.

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http://journal09.magtechjournal.com/gdlxb/CN/10.7605/gdlxb.2001.03.001 或 http://journal09.magtechjournal.com/gdlxb/CN/Y2001/V3/I3/11

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