Changes in water use with growth in Ulmus pumila in semiarid sandy land of northern China

doi:10.1007/s00468-013-0928-3

	Changes in water use with growth in Ulmus pumila in semiarid sandy land of northern China
	Su, Hua 1; Li, Yonggeng 1; Liu, Wei 1; Xu, Hong 1; Sun, Osbert Jianxin
	2014
发表期刊	TREES-STRUCTURE AND FUNCTION
ISSN	0931-1890
卷号	28 期号:1 页码:41-52
摘要	Ulmus pumila vary its water use strategy from seedling to maturity in a water-limited sandy land by adopting different photosynthetical capacities, water use efficiencies and morphological traits. Regeneration failure of natural Ulmus pumila populations has become a growing concern related to vegetation conservation and prediction of environmental change in the sandy lands of northern China. To better understand the life-history strategies of U. pumila and its adaptation to drought in semiarid environments, we studied ecophysiological and morphological traits related to water use in an age sequence of U. pumila representing four age classes: current-year seedlings (Uc), age 2- to 5-year-old saplings (Us), juveniles (Uj), and mature trees (Um). A comparison of hydrogen isotope data in xylem sap, soil water in different layers and groundwater showed that Uc relied on the soil water in the topsoil (0-40 cm), Us and Uj absorbed soil water from deeper soil (> 40 cm), while Um mainly used stable groundwater with very deep (> 2 m) taproots. Significantly lower predawn leaf water potentials were observed in Uc than in Uj or Um, suggesting that Uc experienced more severe water stress and had a weaker capacity to recovery. Moreover, Uc had the highest daily maximum net assimilation rate, daily maximum transpiration rate and daily maximum stomatal conductance, all of which decreased remarkably at midday. A go for broke strategy is probably practiced by Uc which try to provide the growth they need to become established, but with a great risk of mortality. Um used a more conservative strategy by effectively regulating the instantaneous water-use efficiency, and maintaining both stable gas exchange levels and significantly higher long-term water-use efficiency. Uj endured and adapted to drought conditions by developing steeper leaf angles, denser leaf pubescence and more stomata than differently aged plants. Our findings illustrate that significantly different water-use strategies were developed by U. pumila trees as they grew from seedlings to maturity, which were based on different water sources.
关键词	Arid Gas exchange Stable isotope Water source Water-use efficiency
学科领域	Forestry
DOI	10.1007/s00468-013-0928-3
收录类别	SCI
语种	英语
WOS关键词	CARBON-ISOTOPE DISCRIMINATION ; GAS-EXCHANGE CHARACTERISTICS ; USE EFFICIENCY ; HUNSHANDAK SANDLAND ; INNER-MONGOLIA ; DROUGHT STRESS ; CLIMATE-CHANGE ; LOESS PLATEAU ; LEAF ; DESERT
WOS研究方向	Forestry
WOS记录号	WOS:000330624200004
出版者	SPRINGER HEIDELBERG
文献子类	Article
出版地	HEIDELBERG
EISSN	1432-2285
资助机构	State Forestry Administration of China [2008-4-27] ; Chinese Academy of Sciences [XDA05070102] ; Postdoctoral Science Foundation of China [20100480214]
作者邮箱	sunjianx@bjfu.edu.cn
引用统计	被引频次：43[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/27207
专题	植被与环境变化国家重点实验室
作者单位	1.Beijing Forestry Univ, MOE Key Lab Silviculture & Conservat, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Su, Hua,Li, Yonggeng,Liu, Wei,et al. Changes in water use with growth in Ulmus pumila in semiarid sandy land of northern China[J]. TREES-STRUCTURE AND FUNCTION,2014,28(1):41-52.
APA	Su, Hua,Li, Yonggeng,Liu, Wei,Xu, Hong,&Sun, Osbert Jianxin.(2014).Changes in water use with growth in Ulmus pumila in semiarid sandy land of northern China.TREES-STRUCTURE AND FUNCTION,28(1),41-52.
MLA	Su, Hua,et al."Changes in water use with growth in Ulmus pumila in semiarid sandy land of northern China".TREES-STRUCTURE AND FUNCTION 28.1(2014):41-52.

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