Differential responses of canopy nutrients to experimental drought along a natural aridity gradient

doi:10.1002/ecy.2444

	Differential responses of canopy nutrients to experimental drought along a natural aridity gradient
	Luo, Wentao 2; Zuo, Xiaoan 3; Ma, Wang 2; Xu, Chong 1; Li, Ang 4; Yu, Qiang 1; Knapp, Alan K.5,6; Tognetti, Roberto 7,8; Dijkstra, Feike A.9; Li, Mai-He 2,10
刊名	ECOLOGY
	2018-10-01
卷号	99 期号:10 页码:2230-2239
关键词	intraspecific variation long-term aridity manipulative experiment nutritional response sensitivity short-term drought species turnover
ISSN号	0012-9658
DOI	10.1002/ecy.2444
英文摘要	The allocation and stoichiometry of plant nutrients in leaves reflect fundamental ecosystem processes, biotic interactions, and environmental drivers such as water availability. Climate change will lead to increases in drought severity and frequency, but how canopy nutrients will respond to drought, and how these responses may vary with community composition along aridity gradients is poorly understood. We experimentally addressed this issue by reducing precipitation amounts by 66% during two consecutive growing seasons at three sites located along a natural aridity gradient. This allowed us to assess drought effects on canopy nitrogen (N) and phosphorus (P) concentrations in arid and semiarid grasslands of northern China. Along the aridity gradient, canopy nutrient concentrations were positively related to aridity, with this pattern was driven primarily by species turnover (i.e., an increase in the relative biomass of N- and P-rich species with increasing aridity). In contrast, drought imposed experimentally increased N but decreased P concentrations in plant canopies. These changes were driven by the combined effects of species turnover and intraspecific variation in leaf nutrient concentrations. In addition, the sensitivity of canopy N and P concentrations to drought varied across the three sites. Canopy nutrient concentrations were less affected by drought at drier than wetter sites, because of the opposing effects of species turnover and intraspecific variation, as well as greater drought tolerance for nutrient-rich species. These contrasting effects of long-term aridity vs. short-term drought on canopy nutrient concentrations, as well as differing sensitivities among sites in the same grassland biome, highlight the challenge of predicting ecosystem responses to future climate change.
资助项目	Natural Science Foundation of China[41320104002] ; Natural Science Foundation of China[41600302] ; Natural Science Foundation of China[41622103] ; National Key Research and Development Program of China[2016YFC0500601] ; National Key Research and Development Program of China[2016YFC0500602]
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	WILEY
WOS记录号	WOS:000446270400011
内容类型	期刊论文
源URL	[http://210.72.129.5/handle/321005/123285]
专题	中国科学院沈阳应用生态研究所
通讯作者	Wang, Zhengwen
作者单位	1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Hulunber Grassland Ecosyst Observat & Res St, Beijing 10008, Peoples R China 2.Chinese Acad Sci, Inst Appl Ecol, Erguna Forest Steppe Ecotone Res Stn, Shenyang 110164, Liaoning, Peoples R China 3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Urat Desert Grassland Res Stn, Lanzhou 730000, Gansu, Peoples R China 4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 5.Colorado State Univ, Grad Degree Program Ecol, Ft Collins, CO 80523 USA 6.Colorado State Univ, Dept Biol, Ft Collins, CO 80523 USA 7.Univ Molise, Dipartimento Agr Ambiente & Alimenti, I-86090 Campobasso, Italy 8.EFI, Project Ctr Mt Forests MOUNTFOR, I-38010 San Michele All Adige, Italy 9.Univ Sydney, Sydney Inst Agr, Sch Life & Environm Sci, Sydney, NSW 2006, Australia 10.Swiss Fed Inst Forest Snow & Landscape Res WSL, Forest Dynam, CH-8903 Birmensdorf, Switzerland
推荐引用方式 GB/T 7714	Luo, Wentao,Zuo, Xiaoan,Ma, Wang,et al. Differential responses of canopy nutrients to experimental drought along a natural aridity gradient[J]. ECOLOGY,2018,99(10):2230-2239.
APA	Luo, Wentao.,Zuo, Xiaoan.,Ma, Wang.,Xu, Chong.,Li, Ang.,...&Han, Xingguo.(2018).Differential responses of canopy nutrients to experimental drought along a natural aridity gradient.ECOLOGY,99(10),2230-2239.
MLA	Luo, Wentao,et al."Differential responses of canopy nutrients to experimental drought along a natural aridity gradient".ECOLOGY 99.10(2018):2230-2239.