Plant Diversity ›› 2016, Vol. 38 ›› Issue (06): 271-282.DOI: 10.1016/j.pld.2016.11.004

• Review • Previous Articles    

Cenozoic plant diversity of Yunnan: A review

Yongjiang Huanga,d, Linbo Jiaa,e, Qiong Wangb, Volker Mosbruggerc, Torsten Utescherc,f, Tao Sub,d, Zhekun Zhoua,b   

  1. a. Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China;
    b. Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China;
    c. Senckenberg Research Institute/BiK F (Loewe), Senckenberganlage 25, 60325 Frankfurt am Main, Germany;
    d. State Key Laboratory of Paleobiology and Stratigraphy, Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China;
    e. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;
    f. Steinmann Institute, University of Bonn, Nussallee 8, 53115 Bonn, Germany
  • Received:2016-10-10 Revised:2016-11-18 Published:2021-11-05
  • Contact: Zhekun Zhou
  • Supported by:
    This study was supported by the National Natural Science Foundation of China (No. U1502231), the Foundation of the State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences (No. 163108), and the foundation of the Yunnan Key Laboratory for Palaeobiology, Yunnan University (No. 2015DG007-KF01). We thank Dr. Shu-Feng Li (Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences) for help with this study; and professor Robert A. Spicer (The Open University) and the other anonymous reviewer for constructive comments in improving the manuscript. This work is a contribution to Neogene Climate Evolution in Eurasia (NECLIME).

Abstract: Yunnan in southwestern China is renowned for its high plant diversity. To understand how this modern botanical richness formed, it is critical to investigate the past biodiversity throughout the geological time. In this review, we present a summary on plant diversity, floristics and climates in the Cenozoic of Yunnan and document their changes, by compiling published palaeobotanical sources. Our review demonstrates that thus far a total of 386 fossil species of ferns, gymnosperms and angiosperms belonging to 170 genera within 66 families have been reported from the Cenozoic, particularly the Neogene, of Yunnan. Angiosperms display the highest richness represented by 353 species grouped into 155 genera within 60 families, with Fagaceae, Fabaceae, Lauraceae and Juglandaceae being the most diversified. Most of the families and genera recorded as fossils still occur in Yunnan, but seven genera have disappeared, including Berryophyllum, Cedrelospermum, Cedrus, Palaeocarya, Podocarpium, Sequoia and Wataria. The regional extinction of these genera is commonly referred to an aridification of the dry season associated with Asian monsoon development. Floristic analyses indicate that in the late Miocene, Yunnan had three floristic regions: a northern subtropical floristic region in the northeast, a subtropical floristic region in the east, and a tropical floristic region in the southwest. In the late Pliocene, Yunnan saw two kinds of floristic regions: a subalpine floristic region in the northwest, and two subtropical floristic regions separately in the southwest and the eastern center. These floristic concepts are verified by results from our areal type analyses which suggest that in the Miocene southwestern Yunnan supported the most Pantropic elements, while in the Pliocene southwestern Yunnan had abundant Tropical Asia (Indo–Malaysia) type and East Asia and North America disjunct type that were absent from northwestern Yunnan. From the late Miocene to late Pliocene through to the present, floristic composition and vegetation types changed markedly, presumably in response to altitude changes and coeval global cooling. An integration of palaeoclimate data suggests that during the Neogene Yunnan was warmer and wetter than today. Moreover, northern Yunnan witnessed a pronounced temperature decline, while southern Yunnan experienced only moderate temperature changes. Summer precipitation was consistently higher than winter precipitation, suggesting a rainfall seasonality. This summary on palaeoclimates helps us to understand under what conditions plant diversity occurred and evolved in Yunnan throughout the Cenozoic.

Key words: Cenozoic, Fossil plants, Floristic change, Palaeobiodiversity, Palaeoclimate, Yunnan