干旱区生态环境知识资源中心(Arid): The Vulnerability of Qilian Juniper to Extreme Drought Events

Arid

DOI	10.3389/fpls.2019.01191
	The Vulnerability of Qilian Juniper to Extreme Drought Events
	Wang, Xiaofeng 1,2; Yang, Bao1 ; Ljungqvist, Fredrik Charpentier 3,4
通讯作者	Yang, Bao
来源期刊	FRONTIERS IN PLANT SCIENCE
ISSN	1664-462X
出版年	2019
卷号	10
英文摘要	Identifying which trees are more vulnerable to extreme climatic events is a challenging problem in our understanding of forest and even ecosystem dynamics under climate change scenarios. As one of the most widely distributed tree species across the arid and semi-arid northeastern Tibetan Plateau, Qilian juniper (Juniperus przewalskii Kom.), is the main component of the local forest ecosystem, providing critical insurance for the ecological security of the surrounding areas. However, this species's ability to cope with climate extremes (especially drought) has not been adequately assessed. Here, we apply a dendroecological approach that considers indices of resistance and resilience to quantify the vulnerability of Qilian junipers to the extreme drought events of 1957, 1966, 1979, and 1995. A total of 532 Qilian juniper trees from different age stages (100-1,100 years) and altitudes [3,500-4,000 m above sea level (a.s.l.)] were studied to assess their response characteristics during these four drought extremes. We conclude that drought extremes have a significant negative impact on the growth of Qilian juniper. The oldest Qilian junipers at the lower altitudes constituted the most vulnerable populations across the northeastern Tibetan Plateau and were characterized by the lowest resistance values, the narrowest annual rings, and the highest proportion of missing rings during the four drought years. Tree resilience after droughts was strongly related to the intensity of the drought event and did not change with tree age or elevation. A threshold of tree tolerance to drought may exist, with the more vulnerable tree individuals (e.g., the oldest Qilian junipers from lower altitudes) being exposed to the highest mortality risk when drought intensity exceeds the threshold value. Such a threshold needs further consideration, through the study of trees that have died (or are about to die) due to extreme droughts.
英文关键词	Qilian juniper vulnerability drought age effect elevation global warming
类型	Article
语种	英语
国家	Peoples R China ; Sweden
开放获取类型	Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000487998200001
WOS关键词	TREE-RING GROWTH ; TIBETAN PLATEAU ; CLIMATE-CHANGE ; TERRESTRIAL MAGNETISM ; XYLEM CAVITATION ; WATER DEFICITS ; DOUGLAS-FIR ; SILVER FIR ; RECONSTRUCTION ; MOUNTAINS
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215834
作者单位	1.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou, Gansu, Peoples R China; 2.Univ Chinese Acad Sci, Beijing, Peoples R China; 3.Stockholm Univ, Dept Hist, Stockholm, Sweden; 4.Stockholm Univ, Bolin Ctr Climate Res, Stockholm, Sweden
推荐引用方式 GB/T 7714	Wang, Xiaofeng,Yang, Bao,Ljungqvist, Fredrik Charpentier. The Vulnerability of Qilian Juniper to Extreme Drought Events[J],2019,10.
APA	Wang, Xiaofeng,Yang, Bao,&Ljungqvist, Fredrik Charpentier.(2019).The Vulnerability of Qilian Juniper to Extreme Drought Events.FRONTIERS IN PLANT SCIENCE,10.
MLA	Wang, Xiaofeng,et al."The Vulnerability of Qilian Juniper to Extreme Drought Events".FRONTIERS IN PLANT SCIENCE 10(2019).