4.6 Article

Different environmental factors drive tree species diversity along elevation gradients in three climatic zones in Yunnan, southern China

期刊

PLANT DIVERSITY
卷 43, 期 6, 页码 433-443

出版社

KEAI PUBLISHING LTD
DOI: 10.1016/j.pld.2021.04.006

关键词

Air temperature; Climate zones; Montane forest; Soil moisture; Seedling; Tree species distribution

资金

  1. National Natural Science Foundation of China [31800353, 32061123003]
  2. West Light Foundation of the Chinese Academy of Sciences
  3. Applied Fundamental Research Foundation of Yunnan Province [2019FB038, 2014GA003, 2013FB079]
  4. National Key Basic Research Program of China [2014CB954100]
  5. QueenslandeChinese Academy of Sciences Biotechnology Fund [GJHZ1130]

向作者/读者索取更多资源

This study examined elevational patterns of tree diversity and composition in tropical, subtropical, and subalpine forests in Yunnan Province, China. It found that species diversity decreased with increasing elevation, and species composition varied significantly within all three climatic zones. Specific tree species had elevational preferences, but abundant species at specific elevations had limited recruitment in the understory. The major factors determining elevational distributions of tree species varied across climatic zones, with air temperature playing a larger role in subalpine areas and soil moisture in tropical regions.
Elevational patterns of tree diversity are well studied worldwide. However, few studies have examined how seedlings respond to elevational gradients and whether their responses vary across climatic zones. In this study, we established three elevational transects in tropical, subtropical and subalpine mountain forests in Yunnan Province, southern China, to examine the responses of tree species and their seedlings to elevational gradients. Within each transect, we calculated species diversity indices and composition of both adult trees and seedlings at different elevations. For both adult trees and seedlings, we found that species diversity decreased with increasing elevation in both tropical and subalpine transects. Species composition showed significant elevational separation within all three transects. Many species had specific elevational preferences, but abundant tree species that occurred at specific elevations tended to have very limited recruitment in the understory. Our results highlight that the major factors that determine elevational distributions of tree species vary across climatic zones. Specifically, we found that the contribution of air temperature to tree species composition increased from tropical to subalpine transects, whereas the contribution of soil moisture decreased across these transects. Copyright (C) 2021 Kunming Institute of Botany, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.

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