气候变化领域集成服务门户(CCPortal): Species-dependent responses of juniper and spruce to increasing CO2 concentration and to climate in semi-arid and arid areas of northwestern China

CCPortal

DOI	10.1007/s11258-006-9258-5
	Species-dependent responses of juniper and spruce to increasing CO2 concentration and to climate in semi-arid and arid areas of northwestern China
	Liu, Xiaohong; Shao, Xuemei; Liang, Eryuan; Zhao, Liangju; Chen, Tuo; Qin, Dahe; Ren, Jiawen
发表日期	2007
ISSN	1385-0237
EISSN	1573-5052
起始页码	195
结束页码	209
卷号	193 期号:2
英文摘要	Qilian juniper (Sabina przewalskii Kom.) and Qinghai spruce (Picea crassifolia Kom.) represent different tree functional types, which can be found extensively in northwestern China. The former is drought-tolerant, whereas the latter is hygrophilous and shade-tolerant. We compared their intrinsic water-use efficiency (iWUE, inferred from carbon isotopic discrimination, delta>C-13, in their wood) as a function of atmospheric CO2 concentration, [CO2], and climate. delta C-13 of spruce was consistently a higher than that of juniper in semi-arid areas but was lower in arid areas. This difference was stable over time and demonstrated strong cross-correlations between species, although some subtle high-frequency (2 or 3 years) variations existed in both species, suggesting that regional climate may control carbon isotope discrimination. The < ratio (the [CO2] values in leaf intercellular and the atmosphere, respectively) of the juniper increased steadily over time, whereas that of the spruce showed a long-term downward trend. IWUE increased at all sites over the 150-year study period, mainly caused by increasing [CO2]. The relationship between iWUE and [CO2] reveals that the spruce was more sensitive than the juniper to increasing [CO2], suggesting a species-specific adaptation to long-term environmental changes. Correlations between the high-frequency variations in stable carbon discrimination (Delta) and climate indicate similar intra-site responses to climate in both species, but different response strengths. Overall, complex interactions of temperature and moisture on stable carbon discrimination during current growth seasons of both species were environmental-determined. Regulation of gas exchange and reduced transpiration may influence water and energy budgets directly; therefore species-dependent responses of trees to elevated CO2 should be considered in future research on global plant physiological ecology.
关键词	CARBON-ISOTOPE DISCRIMINATION WATER-USE EFFICIENCY TREE-RING WIDTH ATMOSPHERIC CO2 PICEA-CRASSIFOLIA DROUGHT RESPONSES FAGUS-SYLVATICA GAS-EXCHANGE ELEVATED CO2 DELTA-C-13
英文关键词	delta C-13 differences; climate change; intrinsic water-use efficiency; tree rings
语种	英语
WOS研究方向	Plant Sciences ; Environmental Sciences & Ecology ; Forestry
WOS类目	Plant Sciences ; Ecology ; Forestry
WOS记录号	WOS:000250380900004
来源期刊	PLANT ECOLOGY
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/158682
推荐引用方式 GB/T 7714	Liu, Xiaohong,Shao, Xuemei,Liang, Eryuan,et al. Species-dependent responses of juniper and spruce to increasing CO2 concentration and to climate in semi-arid and arid areas of northwestern China[J]. 中国科学院青藏高原研究所,2007,193(2).
APA	Liu, Xiaohong.,Shao, Xuemei.,Liang, Eryuan.,Zhao, Liangju.,Chen, Tuo.,...&Ren, Jiawen.(2007).Species-dependent responses of juniper and spruce to increasing CO2 concentration and to climate in semi-arid and arid areas of northwestern China.PLANT ECOLOGY,193(2).
MLA	Liu, Xiaohong,et al."Species-dependent responses of juniper and spruce to increasing CO2 concentration and to climate in semi-arid and arid areas of northwestern China".PLANT ECOLOGY 193.2(2007).