基于共存分析法和叶缘分析法重建中国渐新世年均温
发布时间：2018-07-21 13:35
【摘要】：渐新世全球气候总体上发生了降温,代表着地球新生代早期的一个"冰室"。植物对气候变化反应敏感,作为地质时期的产物,植物化石能够反映当时陆地气候的变迁。本文利用共存分析法(Coexistence Approach,CA)对中国5个渐新世植物群的年均温进行了恢复,并利用叶缘分析法(Leaf Margin Analysis,LMA)对其中木本双子叶植物不少于15种的4个植物群年均温进行了分析。两类方法的推测值整体表现为CA的年均温相对高于LMA值,其中叶缘分析法东亚模型得出的年均温高于中国模型值。通过对能影响两类方法结果的因素分析,推测CA恢复的值能更好地代表化石点当时的年均温,咸水河组下段植物群为13.3~15.6℃,杨连屯组大桥段植物群为12.1~19.4℃,三合植物群为14.3~16.8℃,景谷植物群为19.7~23.7℃,宁明组植物群为22.0~23.6℃。由于CA恢复的年均温都高于当地现在的年均温,推测渐新世时,虽然全球温度自始新世以来整体相对降低,但还是比现在温暖。
[Abstract]:The global climate of Oligocene generally cooled, representing an ice chamber in the early Cenozoic. Plants are sensitive to climate change. As a product of geological period, plant fossils can reflect the changes of terrestrial climate at that time. The annual mean temperature of five Oligocene flora in China was recovered by means of coexisting Approacha and leaf margin analysis (LMA) was used to analyze the annual mean temperature of 4 species of woody dicotyledonous plants. The predicted values of the two methods are as a whole that the average annual temperature of CA is relatively higher than that of LMA, and the average annual temperature of the East Asian model of leaf margin analysis is higher than that of the Chinese model. Based on the analysis of the factors that affect the results of the two methods, it is inferred that the CA recovery value can better represent the average annual temperature of the fossil point at that time. The flora of the lower section of the Xianshuihe formation is 13.315.6 鈩，
本文编号：2135693
[Abstract]:The global climate of Oligocene generally cooled, representing an ice chamber in the early Cenozoic. Plants are sensitive to climate change. As a product of geological period, plant fossils can reflect the changes of terrestrial climate at that time. The annual mean temperature of five Oligocene flora in China was recovered by means of coexisting Approacha and leaf margin analysis (LMA) was used to analyze the annual mean temperature of 4 species of woody dicotyledonous plants. The predicted values of the two methods are as a whole that the average annual temperature of CA is relatively higher than that of LMA, and the average annual temperature of the East Asian model of leaf margin analysis is higher than that of the Chinese model. Based on the analysis of the factors that affect the results of the two methods, it is inferred that the CA recovery value can better represent the average annual temperature of the fossil point at that time. The flora of the lower section of the Xianshuihe formation is 13.315.6 鈩，
本文编号：2135693
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