气候变化领域集成服务门户(CCPortal): Annual increments of juniper dwarf shrubs above the tree line on the central Tibetan Plateau: a useful climatic proxy

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DOI	10.1093/aob/mcr315
	Annual increments of juniper dwarf shrubs above the tree line on the central Tibetan Plateau: a useful climatic proxy
	Liang, Eryuan; Lu, Xiaoming; Ren, Ping; Li, Xiaoxia; Zhu, Liping; Eckstein, Dieter
通讯作者	Liang, E (通讯作者)
发表日期	2012
ISSN	0305-7364
EISSN	1095-8290
起始页码	721
结束页码	728
卷号	109 期号:4
英文摘要	Dendroclimatology is playing an important role in understanding past climatic changes on the Tibetan Plateau. Forests, however, are mainly confined to the eastern Tibetan Plateau. On the central Tibetan Plateau, in contrast, shrubs and dwarf shrubs need to be studied instead of trees as a source of climate information. The objectives of this study were to check the dendrochronological potential of the dwarf shrub Wilson juniper (Juniperus pingii var. wilsonii) growing from 4740 to 4780 m a.s.l. and to identify the climatic factors controlling its radial growth. Forty-three discs from 33 stems of Wilson juniper were sampled near the north-eastern shore of the Nam Co (Heavenly Lake). Cross-dating was performed along two directions of each stem, avoiding the compression-wood side as far as possible. A ring-width chronology was developed after a negative exponential function or a straight line of any slope had been fit to the raw measurements. Then, correlations were calculated between the standard ring-width chronology and monthly climate data recorded by a weather station around 100 km away. Our study has shown high dendrochronological potential of Wilson juniper, based on its longevity (one individual was 324 years old), well-defined growth rings, reliable cross-dating between individuals and distinct climatic signals reflected by the ring-width variability. Unlike dwarf shrubs in the circum-arctic tundra ecosystem which positively responded to above-average temperature in the growing season, moisture turned out to be growth limiting for Wilson juniper, particularly the loss of moisture caused by high maximum temperatures in MayJune. Because of the wide distribution of shrub and dwarf shrub species on the central Tibetan Plateau, an exciting prospect was opened up to extend the presently existing tree-ring networks far up into one of the largest tundra regions of the world.
关键词	NAM CO BASIN PRECIPITATION VARIATION TEMPERATURE-VARIATIONS SUMMER TEMPERATURE QILIAN MOUNTAINS ANNUAL GROWTH RINGS RECONSTRUCTION VARIABILITY SIGNALS
英文关键词	Central Tibetan Plateau; high altitude; Juniperus pingii var; wilsonii; dwarf shrub; cross-dating; dendrochronology; dendroclimatology; growth ring; tree ring; growth-limiting factor; climate proxy
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000300731500004
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/257984
推荐引用方式 GB/T 7714	Liang, Eryuan,Lu, Xiaoming,Ren, Ping,et al. Annual increments of juniper dwarf shrubs above the tree line on the central Tibetan Plateau: a useful climatic proxy[J]. 中国科学院青藏高原研究所,2012,109(4).
APA	Liang, Eryuan,Lu, Xiaoming,Ren, Ping,Li, Xiaoxia,Zhu, Liping,&Eckstein, Dieter.(2012).Annual increments of juniper dwarf shrubs above the tree line on the central Tibetan Plateau: a useful climatic proxy.ANNALS OF BOTANY,109(4).
MLA	Liang, Eryuan,et al."Annual increments of juniper dwarf shrubs above the tree line on the central Tibetan Plateau: a useful climatic proxy".ANNALS OF BOTANY 109.4(2012).