论文部分内容阅读
长期以来,科学家们对白垩纪-古近纪(K-Pg)之交陆地上生物大灭绝事件的趋势与灭绝速率争论不断。这些争论主要集中在脊椎动物上,尤其是非鸟恐龙。尽管如此,在理解K-Pg之交的生物响应以及相关的生态系统扰动时,植被的演化也是一个重要的组成部分。本文综述北半球内白垩纪晚期至古近纪Aquilapollenites古孢粉地理大区的孢粉地层学:在美国,晚白垩世生物组合以一系列关键门类的出现为标志,其中三冬期—坎潘期过渡期以Aquilapollenites以及相关的三突起型属的出现为标志,而马斯特里赫特阶的底界以睛形型的Wodehouseia属与Kurtzipitessp.的出现为标志;Wodehouseia spinata生物组合带以较大的个体与复杂的壁构造为特征,其中一系列的被子植物孢粉单元在K-Pg之交的记录中消失了,这使得K-Pg灭绝事件容易识别;具孔类花粉和Momipites与Caryapollenites两个属的关键种的出现,标志着古近纪孢粉植物群的复苏。近期的资料涵盖了北美大陆的大部分记录,而中国、欧洲和南半球的更多研究将更有助于理解全球陆地生物圈对K-Pg之交撞击事件的响应。
For a long time, scientists have been debating the trend of extinction and the rate of extinction at the site of the K-Pg dating from Cretaceous. These debates are mainly focused on vertebrates, especially non-bird dinosaurs. Nonetheless, the evolution of vegetation is also an important component in understanding the biological response at the turn of K-Pg and related ecosystem disturbances. This paper reviews the sporo-pollen stratigraphy in the Northern Cretaceous Aquilapollenites from the Cretaceous to the Paleogene. In the United States, the Late Cretaceous biological assemblage was marked by the emergence of a series of key categories, of which the three winter-Campanian transitions The Aquilapollenites and related triple-genus occurrences are marked by the period, while the lower boundary of the Maastricht-scale is marked by the advent of the Wodehouseia genus and Kurtzipitessp., And the Wodehouseia spinata genus assemblage with larger Individuals and complex wall structures are characterized by a series of angiosperm pollen units that disappear from the record of K-Pg dating, making K-Pg extinct events easily identifiable; Permeable pollen and two families of Momipites and Caryapollenites The emergence of key species is a symbol of the restoration of Paleogene flora. Recent data cover most of the North American continent records, while more studies in China, Europe and the Southern Hemisphere will be more useful in understanding the global response to K-Pg’s global impact on the Earth’s biosphere.