气候变化领域集成服务门户(CCPortal): Is precipitation a trigger for the onset of xylogenesis in Juniperus przewalskii on the north-eastern Tibetan Plateau?

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DOI	10.1093/aob/mcu259
	Is precipitation a trigger for the onset of xylogenesis in Juniperus przewalskii on the north-eastern Tibetan Plateau?
	Ren, Ping; Rossi, Sergio; Gricar, Jozica; Liang, Eryuan; Cufar, Katarina
通讯作者	Liang, E (通讯作者)
发表日期	2015
ISSN	0305-7364
EISSN	1095-8290
起始页码	629
结束页码	639
卷号	115 期号:4
英文摘要	Background and Aims A series of studies have shown that temperature triggers the onset of xylogenesis of trees after winter dormancy. However, little is known about whether and how moisture availability influences xylogenesis in spring in drought-prone areas. Methods Xylogenesis was monitored in five mature Qilian junipers (Juniperus przewalskii) by microcore sampling from 2009 to 2011 in a semi-arid area of the north-eastern Tibetan Plateau. A simple physical model of xylem cell production was developed and its sensitivity was analysed. The relationship between climate and growth was then evaluated, using weekly wood production data and climatic data from the study site. Key Results Delayed onset of xylogenesis in 2010 corresponded to a negative standardized precipitation evapotranspiration index (SPEI) value and a continuous period without rainfall in early May. The main period of wood formation was in June and July, and drier conditions from May to July led to a smaller number of xylem cells. Dry conditions in July could cause early cessation of xylem differentiation. The final number of xylem cells was mainly determined by the average production rate rather than the duration of new cell production. Xylem growth showed a positive and significant response to precipitation, but not to temperature. Conclusions Precipitation in late spring and summer can play a critical role in the onset of xylogenesis and xylem cell production. The delay in the initiation of xylogenesis under extremely dry conditions seems to be a stress-avoidance strategy against hydraulic failure. These findings could thus demonstrate an evolutionary adaptation of Qilian juniper to the extremely dry conditions of the north-eastern Tibetan Plateau.
关键词	CAMBIAL ACTIVITY WOOD FORMATION TREE-RINGS SCOTS PINE ENVIRONMENTAL-CONDITIONS MEDITERRANEAN CLIMATES GROWTH PHENOLOGY QINGHAI PROVINCE XYLEM FORMATION ABIES-BALSAMEA
英文关键词	Semi-arid forest; Juniperus przewalskii; juniper; onset of xylogenesis; drought; standardized precipitation evapotranspiration index; SPEI; xylem production rate; wood formation; xylem differentiation
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000354066600007
来源期刊	ANNALS OF BOTANY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258595
推荐引用方式 GB/T 7714	Ren, Ping,Rossi, Sergio,Gricar, Jozica,et al. Is precipitation a trigger for the onset of xylogenesis in Juniperus przewalskii on the north-eastern Tibetan Plateau?[J]. 中国科学院青藏高原研究所,2015,115(4).
APA	Ren, Ping,Rossi, Sergio,Gricar, Jozica,Liang, Eryuan,&Cufar, Katarina.(2015).Is precipitation a trigger for the onset of xylogenesis in Juniperus przewalskii on the north-eastern Tibetan Plateau?.ANNALS OF BOTANY,115(4).
MLA	Ren, Ping,et al."Is precipitation a trigger for the onset of xylogenesis in Juniperus przewalskii on the north-eastern Tibetan Plateau?".ANNALS OF BOTANY 115.4(2015).