Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/j.1751-8369.1999.tb00297.x |
Vegetation re-establishment in polar "lichen-kill" landscapes: a case study of the Little Ice Age impact | |
Levesque, E; Svoboda, J | |
通讯作者 | Levesque, E |
会议名称 | International Symposium on Polar Aspects of Global Change |
会议日期 | AUG 24-28, 1998 |
会议地点 | TROMSO, NORWAY |
英文摘要 | It has been accepted that the extremely sparse vegetation currently observed in Canadian polar deserts is due to prevailing unfavourable climatic conditions, inhibiting plant establishment, growth and survival. Less considered in the literature is the additional antagonistic factor of episodic adverse climatic anomalies. Such was the most recent Little Ice Age (LIA) cooling which caused a setback to, or even large scale extinction of, high Arctic plant communities that had taken centuries to develop. The LIA brought about new glacial advances, expansion of permanent snow banks and formation of ice crusts over entire landscapes. The newly formed ice (and snow) killed the underlying vegetation, thus creating what is in the geological literature referred to as "lichen-kill zones." In these zones the current plant diversity and abundance are exceedingly low and the plants are all relatively young and even-aged, factors which all point to their recent origin. Here we maintain that this vegetation has not yet reached equilibrium with the present prevailing climate and that it is still in an initial stage of succession. We present results of eight upland sites sampled in the vicinity of Alexandra Fiord Lowland, Ellesmere Island, Canada, to demonstrate the slow recolonization process that has been occurring within the last 100-150 years after the LIA termination. The widespread presence of the "lichen-kill" zones throughout the Canadian polar regions reflects the extent and destructive nature of even minor climatic cooling on vulnerable polar ecosystems. |
来源出版物 | POLAR RESEARCH |
ISSN | 0800-0395 |
出版年 | 1999 |
卷号 | 18 |
期号 | 2 |
页码 | 221-228 |
出版者 | CO-ACTION PUBLISHING |
类型 | Article;Proceedings Paper |
语种 | 英语 |
国家 | Canada |
收录类别 | SCI-E ; CPCI-S |
WOS记录号 | WOS:000085228300018 |
WOS关键词 | PLANT-DISTRIBUTION ; DESERT ; COMMUNITIES ; PATTERNS ; ISLAND ; CANADA ; COVER |
WOS类目 | Ecology ; Geosciences, Multidisciplinary ; Oceanography |
WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Oceanography |
资源类型 | 会议论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/292806 |
作者单位 | (1)Univ Quebec, Dept Chim Biol, Trois Rivieres, PQ G9A 5H7, Canada;(2)Univ Toronto, Dept Bot, Mississauga, ON L5L 1C6, Canada |
推荐引用方式 GB/T 7714 | Levesque, E,Svoboda, J. Vegetation re-establishment in polar "lichen-kill" landscapes: a case study of the Little Ice Age impact[C]:CO-ACTION PUBLISHING,1999:221-228. |
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