气候变化领域集成服务门户(CCPortal): Optimal balance of water use efficiency and leaf construction cost with a link to the drought threshold of the desert steppe ecotone in northern China

CCPortal

DOI	10.1093/aob/mcw127
	Optimal balance of water use efficiency and leaf construction cost with a link to the drought threshold of the desert steppe ecotone in northern China
	Wei, Haixia; Luo, Tianxiang; Wu, Bo
通讯作者	Wei, HX (通讯作者)
发表日期	2016
ISSN	0305-7364
EISSN	1095-8290
起始页码	541
结束页码	553
卷号	118 期号:3
英文摘要	Background and Aims In arid environments, a high nitrogen content per leaf area (Narea) induced by drought can enhance water use efficiency (WUE) of photosynthesis, but may also lead to high leaf construction cost (CC). Our aim was to investigate how maximizing Narea could balance WUE and CC in an arid-adapted, widespread species along a rainfall gradient, and how such a process may be related to the drought threshold of the desert-steppe ecotone in northern China. Methods Along rainfall gradients with a moisture index (MI) of 0 center dot 17-0 center dot 41 in northern China and the northern Tibetan Plateau, we measured leaf traits and stand variables including speciinot signc leaf area (SLA), nitrogen content relative to leaf mass and area (N-mass, N-area) and construction cost (CCmass, CCarea), delta C-13 (indicator of WUE), leaf area index (LAI) and foliage N-pool across populations of Artemisia ordosica. Key Results In samples from northern China, a continuous increase of N-area with decreasing MI was achieved by a higher N-mass and constant SLA (reduced LAI and constant N-pool) in high-rainfall areas (MI > 0 center dot 29), but by a lower SLA and N-mass (reduced LAI and N-pool) in low-rainfall areas (MI a parts per thousand currency sign 0 center dot 29). While delta C-13, CCmass and CCarea continuously increased with decreasing MI, the low-rainfall group had higher N-area and delta C-13 at a given CCarea, compared with the high-rainfall group. Similar patterns were also found in additional data for the same species in the northern Tibetan Plateau. The observed drought threshold where MI = 0 center dot 29 corresponded well to the zonal boundary between typical and desert steppes in northern China. Conclusions Our data indicated that below a climatic drought threshold, drought-resistant plants tend to maximize their intrinsic WUE through increased N-area at a given CCarea, which suggests a linkage between leaf functional traits and arid vegetation zonation.
关键词	CHEMICAL-COMPOSITION ENERGETIC COST LOW-RAINFALL CARBON GAIN NITROGEN NUTRIENT AREA ASSIMILATION PLANTS MASS
英文关键词	Carbon isotope; drought threshold; leaf area index; leaf trait relation; moisture index; sandy land; vegetation zonation; Artemisia ordosica
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000383591200014
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/258682
推荐引用方式 GB/T 7714	Wei, Haixia,Luo, Tianxiang,Wu, Bo. Optimal balance of water use efficiency and leaf construction cost with a link to the drought threshold of the desert steppe ecotone in northern China[J]. 中国科学院青藏高原研究所,2016,118(3).
APA	Wei, Haixia,Luo, Tianxiang,&Wu, Bo.(2016).Optimal balance of water use efficiency and leaf construction cost with a link to the drought threshold of the desert steppe ecotone in northern China.ANNALS OF BOTANY,118(3).
MLA	Wei, Haixia,et al."Optimal balance of water use efficiency and leaf construction cost with a link to the drought threshold of the desert steppe ecotone in northern China".ANNALS OF BOTANY 118.3(2016).