气候变化领域集成服务门户(CCPortal): Critical temperature and precipitation thresholds for the onset of xylogenesis of Juniperus przewalskii in a semi-arid area of the north-eastern Tibetan Plateau

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DOI	10.1093/aob/mcx188
	Critical temperature and precipitation thresholds for the onset of xylogenesis of Juniperus przewalskii in a semi-arid area of the north-eastern Tibetan Plateau
	Ren, Ping; Rossi, Sergio; Julio Camarero, J.; Ellison, Aaron M.; Liang, Eryuan; Penuelas, Josep
通讯作者	Liang, EY (通讯作者)
发表日期	2018
ISSN	0305-7364
EISSN	1095-8290
起始页码	617
结束页码	624
卷号	121 期号:4
英文摘要	The onset of xylogenesis plays an important role in tree growth and carbon sequestration, and it is thus a key variable in modelling the responses of forest ecosystems to climate change. Temperature regulates the resumption of cambial activity, but little is known about the effect of water availability on the onset of xylogenesis in cold but semi-arid regions. The onset of xylogenesis during 2009-2014 was monitored by weekly microcoring Juniperus przewalskii trees at upper and lower treelines on the north-eastern Tibetan Plateau. A logistic regression was used to calculate the probability of xylogenic activity at a given temperature and a two-dimensional reverse Gaussian model to fit the differences between the observed and estimated days of xylogenesis onset at given temperatures and precipitation within a certain time window. The thermal thresholds at the beginning of the growing season were highly variable, suggesting that temperature was not the only factor initiating xylem growth under cold and dry climatic conditions. The onset of xylogenesis was well predicted for climatic thresholds characterized by a cumulative precipitation of 17.0 +/- 5.6 mm and an average minimum temperature of 1.5 +/- 1.4 A degrees C for a period of 12 d. Xylogenesis in semi-arid regions with dry winters and springs can start when both critical temperature and precipitation thresholds are reached. Such findings contribute to our knowledge of the environmental drivers of growth resumption that previously had been investigated largely in cold regions without water shortages during early growing seasons. Models of the onset of xylogenesis should include water availability to improve predictions of xylem phenology in dry areas. A mismatch between the thresholds of temperature and moisture for the onset of xylogenesis may increase forest vulnerability in semi-arid areas under forecasted warmer and drier conditions.
关键词	WOOD FORMATION CAMBIAL ACTIVITY TREE-RINGS ENVIRONMENTAL-CONDITIONS BLACK SPRUCE SCOTS PINE GROWTH DROUGHT PHENOLOGY CONIFERS
英文关键词	Tree growth; temperature; precipitation; critical thresholds; xylogenesis; Juniperus przewalskii; xylem formation; drought; two-dimensional reverse Gaussian model; semi-arid area; Tibetan Plateau
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000427884200007
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/259357
推荐引用方式 GB/T 7714	Ren, Ping,Rossi, Sergio,Julio Camarero, J.,et al. Critical temperature and precipitation thresholds for the onset of xylogenesis of Juniperus przewalskii in a semi-arid area of the north-eastern Tibetan Plateau[J]. 中国科学院青藏高原研究所,2018,121(4).
APA	Ren, Ping,Rossi, Sergio,Julio Camarero, J.,Ellison, Aaron M.,Liang, Eryuan,&Penuelas, Josep.(2018).Critical temperature and precipitation thresholds for the onset of xylogenesis of Juniperus przewalskii in a semi-arid area of the north-eastern Tibetan Plateau.ANNALS OF BOTANY,121(4).
MLA	Ren, Ping,et al."Critical temperature and precipitation thresholds for the onset of xylogenesis of Juniperus przewalskii in a semi-arid area of the north-eastern Tibetan Plateau".ANNALS OF BOTANY 121.4(2018).