Spring drought as a possible cause for disappearance of native Metasequoia in Yunnan Province, China: Evidence from seed germination and seedling growth | |
Fan, Yukun1,2; Wang, Li3; Su, Tao4; Lan, Qinying1,2 | |
刊名 | GLOBAL ECOLOGY AND CONSERVATION
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2020 | |
卷号 | 22期号:x页码:- |
关键词 | MIOCENE QUERCUS CYCLOBALANOPSIS INTENSIFICATION SICHOURENSIS TEMPERATURE TAXODIACEAE ENDEMISM SEQUOIA STORAGE |
ISSN号 | 2351-9894 |
DOI | 10.1016/j.gecco.2020.e00912 |
英文摘要 | Metasequoia glyptostroboides is a well known relict conifer species that was widely distributed in the Northern Hemisphere from the Mesozoic (Cretaceous) to early Cenozoic, after which its distributional range was contracted significantly. To explore the possible reasons for the disappearance of Metasequoia in southwest China, controlled experiments were conducted on seed germination and seedling growth and survival over a range of temperatures and at different levels of water stress. Germination was 76%-83.2% at temperatures ranging from 10 degrees C to 30 degrees C and did not differ significantly. However, germination decreased significantly at 5 degrees C and 35 degrees C. Low water stress (-0.2 MPa to -0.4 MPa) promoted germination of Metasequoia seeds, but at -1.5 MPa to -2 MPa normal seedling emergence was only 1.4-2.4%. Seed germination decreased with an increase in storage temperature, and seeds stored at room temperature (23-25 degrees C) for 6 and 12 months germinated to 0-24.3%. As the concentration of polyethylene glycol 6000 increased, elongation of the roots and stems first increased and then decreased, while the number of leaves and percentage of seedling survival decreased. At -0.6 MPa to -0.7 MPa, seedling survival was only 12%-15%. Thus, moisture conditions were the main factor affecting seed germination and seedling growth and survival of Metasequoia. Our results suggest that the intensification of drought in winter and spring due to development of the monsoon climate in Asia was an important factor for the disappearance of Metasequoia in southwest China. (C) 2020 The Authors. Published by Elsevier B.V. |
学科主题 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
语种 | 英语 |
WOS记录号 | WOS:000539265700009 |
内容类型 | 期刊论文 |
源URL | [http://ir.xtbg.org.cn/handle/353005/11770] ![]() |
专题 | 西双版纳热带植物园_古生态研究组 |
作者单位 | 1.Chinese Acad Sci, CAS Key Lab Trop Plant Resources & Sustainable Us, Germplasm Bank, Xishuangbanna Trop Bot Garden, Mengla 666303, Peoples R China 2.Chinese Acad Sci, Ctr Econ Bot, Core Bot Gardens, Xishuangbanna 666303, Peoples R China 3.Chinese Acad Sci, Ctr Conservat Biol, Core Bot Gardens, Xishuangbanna 666303, Peoples R China 4.Chinese Acad Sci, Xishuangbanna Trop Bot Garden, Herbarium HITBC, Mengla 666303, Yunnan, Peoples R China 5.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Peoples R China |
推荐引用方式 GB/T 7714 | Fan, Yukun,Wang, Li,Su, Tao,et al. Spring drought as a possible cause for disappearance of native Metasequoia in Yunnan Province, China: Evidence from seed germination and seedling growth[J]. GLOBAL ECOLOGY AND CONSERVATION,2020,22(x):-. |
APA | Fan, Yukun,Wang, Li,Su, Tao,&Lan, Qinying.(2020).Spring drought as a possible cause for disappearance of native Metasequoia in Yunnan Province, China: Evidence from seed germination and seedling growth.GLOBAL ECOLOGY AND CONSERVATION,22(x),-. |
MLA | Fan, Yukun,et al."Spring drought as a possible cause for disappearance of native Metasequoia in Yunnan Province, China: Evidence from seed germination and seedling growth".GLOBAL ECOLOGY AND CONSERVATION 22.x(2020):-. |
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