文献类型：期刊文献

英文题名：Variation patterns of plant composition/diversity in Dacrydium pectinatum communities and their driving factors in a biodiversity hotspot on Hainan Island, China

作者：Liu, Haodong[1] Chen, Qiao[1] Liu, Xiao[2,3] Xu, Zhiyang[4] Dai, Yunchuan[5] Liu, Yang[1] Chen, Yongfu[1]

第一作者：Liu, Haodong

通信作者：Chen, YF[1]

机构：[1]Chinese Acad Forestry, Res Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China;[2]Chinese Acad Sci, Inst Geog Sci & Natl Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China;[3]Univ Chinese Acad Sci, Beijing 100049, Peoples R China;[4]East China Inventory & Planning Inst Natl Forestr, Hangzhou 321000, Zhejiang, Peoples R China;[5]Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, Beijing 100091, Peoples R China

年份：2020

卷号：22

外文期刊名：GLOBAL ECOLOGY AND CONSERVATION

收录：;Scopus(收录号：2-s2.0-85082408391);WOS:【SCI-EXPANDED(收录号:WOS:000539263300008)】；

基金：This work was supported by the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFBB2017ZB004).

语种：英文

外文关键词：Tropical mountain forests; Plant diversity; Endangered species; Dacrydium pectinatum; Hainan island

摘要：Climate changes and human-mediated modifications to ecosystems have threatened the biodiversity and habitats of various species. Dacrydium pectinatum is a constructive and endangered species in the tropical mountain forests of Hainan Island, China. In this study, we established sixty-eight 30 m x 30 m permanent plots of D. pectinatum along an environmental axis of temperature and precipitation in the west (Bawangling, 30 plots), southwest (Jianfengling, 30 plots) and east (Diaoluoshan, 8 plots) of Hainan Island. Our objectives are to explore the change mechanisms of plant composition/diversity in the D. pectinatum community at distinct environmental scales and analyze the association between environmental factors (topography, soil and stand conditions) and vegetation distribution. The results showed that the diversity of D. pectinatum communities was lower than that in tropical forests at other sites around the world and much higher than that in subtropical forests at similar latitudes. At the regional scale, plant diversity showed a pattern that decreases with increasing latitude; at the local scale, diversity decreases with increasing elevation. Eight environmental factors, namely, elevation, slope, canopy density, soil organic matter, soil pH, soil total nitrogen, soil available phosphorus and soil available potassium, showed a significant correlation to species distribution. Elevation factors were identified as the determinants of the overall diversity patterns. In conclusion, our study clarified that abiotic environmental factors strongly influence the vegetation structure and diversity pattern of the D. pectinatum communities in various environmental scales. Low temperatures, high humidity, low soil nutrients, and high stand density may be the limiting factors that cause their diversity to decline. We recommend various actions to ameliorate the impact of environmental changes on the D. pectinatum community, such as protecting existing habitats, strengthening monitoring of restrictive environmental factors, appropriate thinning of higher density stands, and conducting research on genetic diversity to improve the community survivability. (C) 2020 The Authors. Published by Elsevier B.V.