There are many extant endemic plants in China, which were widely distributed in the North Hemisphere during Tertiary. The global cooling during the Tertiary caused a series of narrow distribution regions of the plants...There are many extant endemic plants in China, which were widely distributed in the North Hemisphere during Tertiary. The global cooling during the Tertiary caused a series of narrow distribution regions of the plants. Quaternary glaciation invaded most regions of North America and Eurasia where severe destruction was imposed onto vegetation. However, such destruction was lessened in China largely because of specific topographic and geographical and obviously, a number of other conditions accounted for an unusual refugee camp for the relics of plants in China, among which lots of endemic taxa exist. Recently, Chinese endemic species, such as Metaseqouia, Eucommia , have been employed to conduct multi_disciplinary comprehensive studies so as to analyze Tertiary climate changes quantitatively. Meanwhile, a rigorous method, i.e. climate analysis of endemic species (CAES) has come to maturation. This method is characteristic of some generality because it is supposed to be applicable to the endemic species in other regions of the world. CAES is involved in the following aspects: 1. Conduct multidisciplinary studies on living and fossil species of endemic plants and trace their evolutionary courses. 2. Compare fossil species with living one and clarify which is the nearest living relative (NLR) to fossil counterpart. 3. Fossils and their living counterparts (NLR) are supposed to have similar ecological requirements to meet their life cycles. 4. Investigate the geographic distribution of living and fossil plants within the same taxa and ascertain the dynamic changes of their distributions in geological age. 5. Analyze climate factors in the distribution of specific endemic taxa and obtain the data of climatic characters which are suitable for reconstruction of paleoclimate where fossil counterparts lived. 6. Further study the physio_ecology of living species and determinate paleoclimate where fossil counterparts lived. 7. Integrate analysis of the data from steps 4, 5 and 6, and quantitatively reconstruct the climate where fossil and living plants survive.展开更多
根据花粉恢复的古植被表明中国森林区的常绿阔叶林、落叶阔叶林以及针叶林在6 ka BP向北扩张,反映了6ka BP夏季和冬季均比现代温暖的气候特征。然而,根据地球轨道参数变化驱动的气候模式,由于6kaBP时北半球夏季太阳辐射高于现代,而冬季...根据花粉恢复的古植被表明中国森林区的常绿阔叶林、落叶阔叶林以及针叶林在6 ka BP向北扩张,反映了6ka BP夏季和冬季均比现代温暖的气候特征。然而,根据地球轨道参数变化驱动的气候模式,由于6kaBP时北半球夏季太阳辐射高于现代,而冬季太阳辐射低于现代,模拟的6ka BP夏季温度比现代温暖,但冬季比现代寒冷。模拟得出的冬季寒冷与地质资料显示的冬季增温不一致,说明6 ka BP的气候和植被变化并不完全受到太阳辐射变化的控制。针对这一重大缺陷,我们利用具有陆面过程的全球大气环流模式(AGCM+SsiB),采用了外动力太阳辐射变化和古地表状况的强迫边界场进行了古气候模拟试验。模拟结果能够捕捉到亚洲季风地区6 kaBP冬季气候变暖的气候特征,初步阐明6 ka BP植被变化的气候动力学机制。展开更多
文摘There are many extant endemic plants in China, which were widely distributed in the North Hemisphere during Tertiary. The global cooling during the Tertiary caused a series of narrow distribution regions of the plants. Quaternary glaciation invaded most regions of North America and Eurasia where severe destruction was imposed onto vegetation. However, such destruction was lessened in China largely because of specific topographic and geographical and obviously, a number of other conditions accounted for an unusual refugee camp for the relics of plants in China, among which lots of endemic taxa exist. Recently, Chinese endemic species, such as Metaseqouia, Eucommia , have been employed to conduct multi_disciplinary comprehensive studies so as to analyze Tertiary climate changes quantitatively. Meanwhile, a rigorous method, i.e. climate analysis of endemic species (CAES) has come to maturation. This method is characteristic of some generality because it is supposed to be applicable to the endemic species in other regions of the world. CAES is involved in the following aspects: 1. Conduct multidisciplinary studies on living and fossil species of endemic plants and trace their evolutionary courses. 2. Compare fossil species with living one and clarify which is the nearest living relative (NLR) to fossil counterpart. 3. Fossils and their living counterparts (NLR) are supposed to have similar ecological requirements to meet their life cycles. 4. Investigate the geographic distribution of living and fossil plants within the same taxa and ascertain the dynamic changes of their distributions in geological age. 5. Analyze climate factors in the distribution of specific endemic taxa and obtain the data of climatic characters which are suitable for reconstruction of paleoclimate where fossil counterparts lived. 6. Further study the physio_ecology of living species and determinate paleoclimate where fossil counterparts lived. 7. Integrate analysis of the data from steps 4, 5 and 6, and quantitatively reconstruct the climate where fossil and living plants survive.
文摘根据花粉恢复的古植被表明中国森林区的常绿阔叶林、落叶阔叶林以及针叶林在6 ka BP向北扩张,反映了6ka BP夏季和冬季均比现代温暖的气候特征。然而,根据地球轨道参数变化驱动的气候模式,由于6kaBP时北半球夏季太阳辐射高于现代,而冬季太阳辐射低于现代,模拟的6ka BP夏季温度比现代温暖,但冬季比现代寒冷。模拟得出的冬季寒冷与地质资料显示的冬季增温不一致,说明6 ka BP的气候和植被变化并不完全受到太阳辐射变化的控制。针对这一重大缺陷,我们利用具有陆面过程的全球大气环流模式(AGCM+SsiB),采用了外动力太阳辐射变化和古地表状况的强迫边界场进行了古气候模拟试验。模拟结果能够捕捉到亚洲季风地区6 kaBP冬季气候变暖的气候特征,初步阐明6 ka BP植被变化的气候动力学机制。
