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Special Feature: Celebrating Alfred Russel Wallace’s Bicentenary

Flora and vegetation of Yunnan are shaped by geological events and monsoon climate

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  • Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Yunnan International Joint Laboratory of Southeast Asia Biodiversity Conservation, Yunnan Key Laboratory for the Conservation of Tropical Rainforests and Asian Elephants, Mengla, Yunnan 666303

Received date: 2023-07-22

  Accepted date: 2023-12-18

  Online published: 2024-01-03

Abstract

Background & Aims: Paleobotanical studies show that the basic patterns of modern flora and vegetation in Yunnan originated in the Paleogene. These findings have greatly changed our previous understanding of the origin and evolution of modern vegetation and flora in Yunnan. In this article, the formation and evolution of the modern flora and vegetation of Yunnan will be described by linking geological events to palaeobotanical findings. The proposed formation and evolution of the flora and vegetation of Yunnan are detailed by combining paleobotanical results with the history of geological events since the Cenozoic period and the formation of southwestern monsoon climate.

Review Results: Flora and vegetation of Yunnan have a more ancient history than previously believed. Their formation and evolution have been clearly influenced by the geological events that have occurred since the Cenozoic period. The geographical patterns of Yunnan flora reveal that it had tropical origins and tropical-subtropical Tertiary flora of East Asia in the early stages but was influenced mainly by tropical Asian flora and north temperate flora in the later stages. The uplift of the Himalayan-Qinghai-Tibet Plateau and the accompanying geological events directly affected the evolution of the flora in Yunnan. The development and strengthening of the southwest monsoon climate were the main factors for the formation of vegetation, and specifically tropical rain forest vegetation, in Yunnan. The tropical flora and vegetation (except flora and savanna-like vegetation in hot dry valleys) displayed an increasing bias distribution pattern from northwest to southeast in Yunnan, which could be directly affected by the clockwise rotation and southeast displacement of the Simao-Lanping geological plate and the northward displacement of the plate in North Myanmar. The differentiation of the flora of the subtropical evergreen broad-leaved forests in Yunnan was closely related to the Himalayan uplift in the late Miocene. The formation and strengthening of the southwest monsoon climate by further uplift of Himalayas further promoted the divergence of the subtropical evergreen broad-leaved forests. The evolution of savanna vegetation in the hot dry valleys of Yunnan was believed to be closely related to the geological events such as deep valley formations and river captures caused by the Himalayan uplift, and some representative plant species in the savannas showed a likeness with savannas in India and Africa. The discontinuous remnant tropical deciduous forests (monsoon forest) in Yunnan were believed to be closely associated with the tropical deciduous forests in mainland Southeast Asia during a more seasonal or arid period in or before the Pliocene to Pleistocene caused by a stronger monsoon. The sclerophyllous evergreen broad-leaved forest dominated by Quercus species (Fagaceae) was unique, Tethys-associated remnant vegetation evolved from the former tropical-subtropical evergreen broad-leaved forests in Yunnan. The present tropical rain forest was proposed to be the most recent vegetation type in Yunnan following the formation and strengthening of the southwest monsoon climate.

Conclusion: Our research indicates that since the Oligocene, the evolution of flora and vegetation in Yunnan has been affected by the uplift of the Himalayas and the various accompanying geological events. The development and strengthening of southwest monsoon climate is the main factors for the formation of vegetation in Yunnan, especially for the occurrence of tropical rain forest.

Cite this article

Hua Zhu . Flora and vegetation of Yunnan are shaped by geological events and monsoon climate[J]. Biodiversity Science, 2023 , 31(12) : 23262 . DOI: 10.17520/biods.2023262

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[85] Zhou Z, Gu BJ, Sun H, Zhu H, Tan YH (2017) olecular phylogenetic analyses of Euphorbiaceae tribe Epiprineae, with the description of a new genus, Tsaiodendron gen. nov., from south-western China. Botanical Journal of the Linnean Society, 184, 167-184.
[86] Zhou ZK, Pu CX, Chen WY (2003) Relationships between the distributions of sect Heterobalabus (Fagaceae) and uplift of Himalayas. Advance in Earth Science, 18, 885-890. (in Chinese with English abstract)
  [周浙昆, 普春霞, 陈文允 (2003) 青藏高原隆起和高山栎组(壳斗科)分布的关系. 地球科学进展, 18, 885-890.]
[87] Zhu H (1997) Ecological and biogeographical studies on the tropical rain forest of South Yunnan, SW China with a special reference to its relation with rain forests of tropical Asia. Journal of Biogeography, 24, 647-662.
[88] Zhu H (2005) Reclassification of monsoon tropical forests in southern Yunnan, SW China. Acta Phytoecologica Sinica, 29, 170-174. (in Chinese with English abstract)
  [朱华 (2005) 滇南热带季雨林的一些问题讨论. 植物生态学报, 29, 170-174.]
[89] Zhu H (2008a) Advances in biogeography of the tropical rain forest in southern Yunnan, southwestern China. Tropical Conservation Science, 1, 34-42.
[90] Zhu H (2008b) The tropical flora of southern Yunnan, China, and its biogeographical affinities. Annals of the Missouri Botanical Garden, 95, 661-680.
[91] Zhu H (2011a) Tropical monsoon forest in Yunnan with comparison to the tropical rain forest. Chinese Journal of Plant Ecology, 35, 463-470. (in Chinese with English abstract)
  [朱华 (2011a) 云南热带季雨林及其与热带雨林植被的比较. 植物生态学报, 35, 463-470.]
[92] Zhu H (2011b) A new biogeographical line between South Yunnan and Southeast Yunnan. Adance in Earth Science, 26, 916-925. (in Chinese with English abstract)
  [朱华 (2011b) 云南一条新的生物地理线. 地球科学进展, 26, 916-925.]
[93] Zhu H (2012) Biogeographical divergence of the flora of Yunnan, southwestern China initiated by the uplift of Himalaya and extrusion of Indochina Block. PLoS ONE, 7, e45601.
[94] Zhu H (2013) The floras of southern and tropical southeastern Yunnan have been shaped by divergent geological histories. PLoS ONE, 8, e64213.
[95] Zhu H (2015) Geographical patterns of Yunnan seed plants may be influenced by the clockwise rotation of the Simao-Indochina Geoblock. Frontiers in Earth Science, 3, 53.
[96] Zhu H (2016a) A biogeographical comparison between Yunnan, Southwest China, and Taiwan, Southeast China, with implications for the evolutionary history of the East Asian flora. Annals of the Missouri Botanical Garden, 101, 750-771.
[97] Zhu H (2016b) Biogeographical evidences help revealing the origin of Hainan Island. PLoS ONE, 11, e0151941.
[98] Zhu H (2017) A biogeographical study on tropical flora of Southern China. Ecology and Evolution, 7, 10398-10408.
[99] Zhu H (2018a) Origin and evolution of the flora of Yunnan. Plant Science Journal, 36, 32-37. (in Chinese with English abstract)
  [朱华 (2018a) 云南植物区系的起源与演化. 植物科学学报, 36, 32-37.]
[100] Zhu H (2018b) Suggestions for the northern boundary of the tropical zone in China. Plant Science Journal, 36, 893-898. (in Chinese with English abstract)
  [朱华 (2018b) 中国热带生物地理北界的建议. 植物科学学报, 36, 893-898.]
[101] Zhu H (2019) Floristic divergence of the evergreen broad-leaved forests in Yunnan, southwestern China. Phytotaxa, 393, 1-20.
[102] Zhu H (2020) On the biogeographical origin of Hainan Island in China. Plant Science Journal, 38, 839-843. (in Chinese with English abstract)
  [朱华 (2020) 论中国海南岛的生物地理起源. 植物科学学报, 38, 839-843.]
[103] Zhu H (2021) Vegetation geography of evergreen broad-leaved forests in Yunnan, southwestern China. Chinese Journal of Plant Ecology, 45, 224-241. (in Chinese with English abstract)
  [朱华 (2021) 云南常绿阔叶林的植被地理研究. 植物生态学报, 45, 224-241.]
[104] Zhu H (2022a) Vegetation diversity of Yunnan. Journal of Southwest Forestry University (Natural Sciences), 42(1), 1-12. (in Chinese with English abstract)
  [朱华 (2022a) 云南植被多样性研究. 西南林业大学学报(自然科学), 42(1), 1-12.]
[105] Zhu H (2022b) Tropical rain forest of Yunnan (Southwestern China): Characteristics, biogeographical origin and evolution. Journal of Tropical and Subtropical Botany, 30, 575-591. (in Chinese with English abstract)
  [朱华 (2022b) 云南热带雨林: 特征、生物地理起源与演化. 热带亚热带植物学报, 30, 575-591.]
[106] Zhu H (2023a) Community Ecology and Biogeography of the Tropical Rain Forest in Yunnan. Science Press, Beijing. (in Chinese)
  [朱华 (2023a) 云南热带雨林的生态学与生物地理学研究. 科学出版社, 北京.]
[107] Zhu H (2023b) Sclerophyllous evergreen broad-leaved forest in Yunnan—A remnant vegetation related to Tethys. Guihaia, 43, 234-241. (in Chinese with English abstract)
  [朱华 (2023b) 云南的硬叶常绿阔叶林——古地中海残余植被. 广西植物, 43, 234-241.]
[108] Zhu H, Ashton P (2021) Ecotones in the tropical-subtropical vegetation transition at the tropical margin of southern China. Chinese Science Bulletin, 66, 3732-3743. (in Chinese with English abstract)
  [朱华, Ashton P (2021) 中国热带-亚热带常绿阔叶林群落交错区. 科学通报, 66, 3732-3743.]
[109] Zhu H, Ashton P, Gu BJ, Zhou SS, Tan YH (2021) Tropical deciduous forest in Yunnan, southwestern China: Implications for geological and climatic histories from a little-known forest formation. Plant Diversity, 43, 444-451.
[110] Zhu H, Du F (2022) Suggestion to establish a nature reserve for protecting native savanna vegetation in hot dry valley of Jinshajiang, Yunnan. Biodiversity Science, 30, 21519. (in Chinese with English abstract)
  [朱华, 杜凡 (2022) 设立云南金沙江干热河谷萨王纳植被自然保护地的建议. 生物多样性, 30, 21519.]
[111] Zhu H, Shi JP, Zhao CJ (2005) Species composition, physiognomy and plant diversity of the tropical montane evergreen broad-leaved forest in southern Yunnan. Biodiversity & Conservation, 14, 2855-2870.
[112] Zhu H, Tan YH (2022) Flora and vegetation of Yunnan, southwestern China: Diversity, origin and evolution. Diversity, 14, 340.
[113] Zhu H, Tan YH, Yan LC, Liu FY (2020) Flora of the savanna-like vegetation in hot dry valleys, southwestern China with implications to their origin and evolution. The Botanical Review, 86, 281-297.
[114] Zhu H, Wang H, Li BG, Zhou SS, Zhang JH (2015) Studies on the forest vegetation of Xishuangbanna. Plant Science Journal, 33, 641-726. (in Chinese with English abstract)
  [朱华, 王洪, 李保贵, 周仕顺, 张建侯 (2015) 西双版纳森林植被研究. 植物科学学报, 33, 641-726.]
[115] Zhu H, Yan LC (2002) A discussion on biogeographical lines of the tropical-subtropical Yunnan. Chinese Geographical Science, 12, 90-96.
[116] Zhu H, Yan LC (2003) Note on the realities and significances of the “Tanaka line” and the “Ecogeographical Diagonal line” in Yunnan. Advance in Earth Sciences, 18, 871-877. (in Chinese with English abstract)
  [朱华, 阎丽春 (2003) 再论“田中线”和“滇西-滇东南”生态地理(生物地理)对角线”的真实性和意义. 地球科学进展, 18, 871-877.]
[117] Zhu H, Yan LC (2009) Biogeographical affinities of the flora of southeastern Yunnan, China. Botanical Studies, 50, 467-475.
[118] Zhu H, Zhou SS, Yan LC, Shi JP, Shen YX (2019) Studies on the evergreen broad-leaved forests of Yunnan, southwestern China. The Botanical Review, 85, 131-148.
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