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	Long-term variation of tree growth and intrinsic water-use efficiency in Schrenk spruce with increasing CO2 concentration and climate warming in the western Tianshan Mountains, China
	Wu, Guoju1,2; Liu, Xiaohong1; Chen, Tuo1; Xu, Guobao1,2; Wang, Wenzhi1,2; Zeng, Xiaomin1,2; Wang, Bo1,2; Zhang, Xuanwen1,2
刊名	ACTA PHYSIOLOGIAE PLANTARUM
	2015-08-01
卷号	37期号:8页码:14
关键词	Radial growth Tree-ring delta C-13 iWUE Drought Climatic warming China's western Tianshan Mountains
ISSN号	0137-5881
DOI	10.1007/s11738-015-1903-y
通讯作者	Liu, Xiaohong(liuxh@lzb.ac.cn)
英文摘要	We combined dendrochronological methods and interannual delta C-13 measurements to investigate radial growth and physiological responses of Schrenk spruce (Picea schrenkiana) in response to rising atmospheric CO2 concentration (Ca) and changing climate in high-elevation forests in China's western Tianshan Mountains. The mean maximum temperature in May to August, reconstructed from delta C-13, revealed an overall warming trend, with persistent warm periods from 1910 to 1920, and from 1970 to 1980. Intrinsic water use efficiency (iWUE) increased by 28 % over the last 160 years; temporal trends in iWUE were calculated under three theoretical scenarios as a baseline for interpreting the observed gas-exchange at increasing Ca. Basal area increment (BAI) increased by 51.4 % since 1850 with two apparent increases and decreases. Trees exhibited sharp declines in BAI along with enhanced iWUE during the warmer periods; this was possibly due to a reduced stomatal conductance which prevented excessive water loss from trees. Conversely, BAI increased at reduced iWUE (-3.6 %, -7.4 %) during two cold-wet periods (e.g., 1880 to 1992, and 1945 to 1960), suggesting that a diminished water stress caused the observed growth pattern. However, BAI increased significantly (49.4 %) from 1965 to 1983 with constant intercellular atmospheric CO2 concentrations (Ci) response scenario under acute water limitations, indicating the CO2 stimulation of tree growth. These results showed that even at high elevations, increased iWUE may not lead to long-term enhancement of tree growth, and other factors may counteract CO2-fertilization effects, especially those related to a warming-induced drought. The results of this study suggest that the current models may overestimate the sink capacity of temperate forests, and indicate that multi-proxy records are needed to disentangle the role of a limiting factor in modulating the response of the Schrenk spruce forest to current climate change scenarios.
收录类别	SCI
WOS关键词	SUMMER TEMPERATURE RECONSTRUCTION ; CARBON-ISOTOPE DISCRIMINATION ; ATMOSPHERIC CO2 ; NORTHWESTERN CHINA ; STABLE-ISOTOPES ; RING DELTA-C-13 ; SOIL-MOISTURE ; UNITED-STATES ; FOREST GROWTH ; DROUGHT
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
语种	英语
出版者	SPRINGER HEIDELBERG
WOS记录号	WOS:000358991300009
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557068
专题	寒区旱区环境与工程研究所
通讯作者	Liu, Xiaohong
作者单位	1.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wu, Guoju,Liu, Xiaohong,Chen, Tuo,et al. Long-term variation of tree growth and intrinsic water-use efficiency in Schrenk spruce with increasing CO2 concentration and climate warming in the western Tianshan Mountains, China[J]. ACTA PHYSIOLOGIAE PLANTARUM,2015,37(8):14.
APA	Wu, Guoju.,Liu, Xiaohong.,Chen, Tuo.,Xu, Guobao.,Wang, Wenzhi.,...&Zhang, Xuanwen.(2015).Long-term variation of tree growth and intrinsic water-use efficiency in Schrenk spruce with increasing CO2 concentration and climate warming in the western Tianshan Mountains, China.ACTA PHYSIOLOGIAE PLANTARUM,37(8),14.
MLA	Wu, Guoju,et al."Long-term variation of tree growth and intrinsic water-use efficiency in Schrenk spruce with increasing CO2 concentration and climate warming in the western Tianshan Mountains, China".ACTA PHYSIOLOGIAE PLANTARUM 37.8(2015):14.

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