J Syst Evol

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Evolution of East Asian subtropical evergreen broad-leaved forests: When and how?

Hong‐Hu Meng1,2,3*, Yi‐Gang Song4, Guo‐Xiong Hu5, Pei‐Han Huang1,4,6, Min Li1,6, Ou‐Yan Fang1,6, Ren‐PingSu1,6, Guan‐Long Cao6,7, Xiang Cai1,6, Shi‐Shun Zhou2, Yun‐Hong Tan2, Xiao‐Guo Xiang8, Wei Wang6,7*, Zhe‐KunZhou9, and Jie Li1*   

  1. 1Plant Phylogenetics and Conservation Group, Center for Integrative Conservation & Yunnan Key Laboratory for Conservation of Tropical Rainforests and Asian Elephants, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China
    2Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Nay Pyi Taw 05282, Myanmar
    3Yunnan International Joint Laboratory for the Conservation and Utilization of Tropical Timber Tree Species, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China
    4Eastern China Conservation Centre for Wild Endangered Plant Resources, Shanghai Chenshan Botanical Garden, Shanghai 201602, China
    5College of Life Sciences, Guizhou University, Guiyang 550025, China
    6University of Chinese Academy of Sciences, Beijing 100049, China
    7State Key Laboratory of Systematic and Evolutionary Botany, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China
    8Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Education, School of Life Sciences, Nanchang University, Nanchang 330031, China
    9CAS Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303,China

    *Authors for correspondence. Hong‐Hu Meng. E‐mail: menghonghu@xtbg.ac.cn; Wei Wang. E‐mail: wangwei1127@ibcas.ac.cn; Jie Li. E‐mail:jieli@xtbg.ac.cn
  • Received:2024-11-20 Accepted:2025-05-29 Online:2025-07-08
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (42171063, 32361133549, and 32170210); Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences (Y4ZK111B01); the “Yunnan Revitalization Talent Support Program” in Yunnan Province (XDYC‐QNRC‐2022‐0028); Yunnan Revitalization Talent Support Program “Innovation Team” Project (202405AS350019); the Special Fund for Scientific Research of Shanghai Landscaping and City Appearance Administrative Bureau (G242414, G242416); the CAS “Light of West China” Program; and the 14th Five‐Year Plan of Xishuangbanna Tropical Botanical Garden, Chinese Academy Sciences (XTBG‐1450303).

Abstract: Understanding how East Asian subtropical evergreen broad-leaved forests (EBLFs) have evolved over time is not only vital for biodiversity conservation but also facilitates predictive modeling of ecosystem services under global change scenarios. During recent decades, numerous studies have been devoted to investigating the evolution of EBLFs. However, there are often contradictory interpretations of the different taxa associated with different geological events and environmental backgrounds. Here, we synthesize several key aspects of the spatiotemporal evolution of EBLFs. First, the EBLFs emerged concomitantly with the development of Asian monsoon systems, occurring no earlier than the Eocene. While the southernmost region was inhabited by tropical elements, EBLFs are not the direct relic of boreotropical flora because of the presence of a broad arid belt at that time. Rather, they represent a unique assemblage including boreotropical relics, tropical floras and deciduous broad-leaved forests. Second, the evolution of EBLFs should not be contextualized within an enclave, the adjacent vegetation systems to elucidate the potential connections between EBLFs and other biomes should be considered to avoid an isolated phenomenon. Third, the adaptive response of EBLFs to environmental changes caused by anthropogenic disturbance in subtropical regions remains understudied. Such a knowledge gap must be addressed to develop effective conservation strategies to sustain the ecosystem amid the dual pressure of climate change and human activity in the future. Finally, current research has predominantly focused on the dominant tree species in EBLFs, whereas comprehensive understanding requires expanding the investigation of associated flora, including understory trees and herbaceous plants. This review not only consolidates contemporary perspectives on the evolution of EBLFs but also proposes a framework to navigate the Anthropocene challenges. By bridging historical patterns with future projections, we aim to catalyze transformative research on EBLFs’ resilience and sustainable management, fostering further research and development regarding the resurgence.

Key words: biodiversity conservation, Cenozoic, East Asian monsoon, evergreen broad‐leaved forests, evolution, geographic distribution