Botanica Pacifica

Survey paper

Botanica Pacifica. A journal of plant science and conservation Preprint
Article first published online: 31 OCT 2015 | DOI: 10.17581/bp.2015.04219

Historical Distribution of Metasequoia Referenced to Paleoclimate Factors

Yi Zhang 1, 2 & Jia-Jia Wang 1, 2

1 College of Paleontology, Shenyang Normal University, Shenyang 110034, China
2 Laboratory for Evolution of Past Life in Northeast Asia, Ministry of Land and Resources, China, Shenyang 110034, China

Metasequoia Miki 1941 was a prominent element of vegetation distributed in the high latitudes of Northern Hemisphere from the late Early Cretaceous to Miocene. However, at present this genus survived only in some mountain areas of Hubei, Hunan and Chongqing of China as a relict genus. Although the distribution of Metasequoia through geologic time have been studied in detail, the relationship between its distribution and paleoclimates remained unclear. In this paper, the potential migratory routes of Metasequoia are explained on the basis of the its fossil records plotted in the paleoclimate maps. It can be concluded that: 1) the Warm Temperate climate favored to the diffusion of Metasequoia, while the Arid climate curbs its migration; 2) with the global temperature decreased markedly since Pliocene, Metasequoia was forced to migrate to the south, and survived only in South China, under the Warm Temperate climate support.

Жан Й., Ван Ж.Ж. Историческое распространение Metasequoia по отношению к палеоклиматическим факторам. Metasequoia Miki 1941 была весьма значимым элементом растительного покрова, распространенным в высоких широтах Северного полушария с конца раннего мела до миоцена. Тем не менее, представители этого рода в настоящее время сохранились только в некоторых горных районах провинций Хубэй, Хунань и Чунцин в Китае как реликтовые растения. Хотя распространение Metasequoia в геологическом времени было детально изучено в предыдущих исследованиях, отношения между распространением рода и факторами палеоклимата оставались не ясными. В данной статье потенциальные миграционные маршруты Metasequoia прояснаются путем наложения местоположения найденных фоссилий Metasequoia на разработанные палеоклиматические карты. Полученные результаты позволяют сделать следующие выводы: 1) теплоумеренный климат благоприятствовал распространению Metasequoia, в то время как засушливый климат сдерживал миграции рода; 2) по мере понижения глобальных температур в плиоцене Metasequoia мигрировала на юг и выжила в настоящее время только в Южном Китае, в условиях теплоумеренного климата.

Keywords: Metasequoia, distribution, paleoclimate factors, распространение, палеоклиматические факторы



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