Discovery of Betula mioluminifera Hu et Chaney from the Miocene in Eastern Zhejiang and Reconstruction of Palaeoclimate
Discovery of Betula mioluminifera Hu et Chaney from the Miocene in Eastern Zhejiang and Reconstruction of Palaeoclimate
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发表时间：
2008
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通讯作者：
Dai Jing
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作者：
Dai Jing
随着古气候与古环境研究的加强，“特有种气候分析”方法已成为定量恢复古气候的有效方法之一。利用该方法对浙江天台中新世下南山组的白桦化石进行了压缩分析，研究了化石的叶结构和角质结构。定量重建了浙东中新世年平均气温12.5~2 2.1℃和春季温度13.0~2 3.1℃。结果表明，该方法具有较高的分辨率和较高的分辨率中新世古气候较今温暖，在内蒙古、吉林、山东、云南等省的中国地区晚第三纪发现了光皮桦，其自然分布的北界为42°N。活的光皮桦是与化石光皮桦最接近的亲缘种，也是中国特有种。它生长在海拔500~1800米，地理位置在101°E~119°E，23°N~34°N之间。光皮桦的分布范围在中新世的某个时期呈逐渐变冷的趋势。
Along with the strengthening of the research of palaeoclimate and palaeoenvironment,the "climate analysis of endemic species" method has become one of efficient methods that can reconstruct palaeoclimate quantitatively.The compression of fossil Betula mioluminifera Hu et Chaney in the Xia' nanshan Formation of the Miocene in Tiantai,Zhejiang province,China,was analyzed by this method,and the leaf architecture and cuticular structure of the fossil were studied.The mean annual temperature 12.5～22.1℃ and the spring temperature 13.0～23.1℃ in the Miocene of Eastern Zhejiang were quantitatively reconstructed.As a result,the palaeoclimate of the Miocene was warmer than that of today.Fossil Betula mioluminifera had been found in the Neogene in Inner Mongolia,Jilin,Shandong and Yunnan Provinces in China,and the northern boundary of its natural distribution is 42°N.The living Betula luminifera is the nearest living relative species of fossil Betula mioluminifera and is also an endemic species in China.It grows from 500～1 800 m above sea level,within the geographic range from 101°E to 119°E and 23°N to 34°N.The decrease of distribution range of Betula luminifera shows a gradual cool climate trend gradually in some time of the Miocene.