Changes in water use with growth in Ulmus pumila in semiarid sandy land of northern China
文献类型：期刊论文
| 作者 | Su, Hua1; Li, Yonggeng1; Liu, Wei1; Xu, Hong1; Sun, Osbert Jianxin |
| 刊名 | TREES-STRUCTURE AND FUNCTION
 |
| 出版日期 | 2014 |
| 卷号 | 28期号:1页码:41-52 |
| 关键词 | Arid Gas exchange Stable isotope Water source Water-use efficiency |
| ISSN号 | 0931-1890 |
| DOI | 10.1007/s00468-013-0928-3 |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 学科主题 | Forestry |
| 出版地 | HEIDELBERG |
| 电子版国际标准刊号 | 1432-2285 |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:000330624200004 |
| 出版者 | SPRINGER HEIDELBERG |
| 资助机构 | State Forestry Administration of China [2008-4-27] ; Chinese Academy of Sciences [XDA05070102] ; Postdoctoral Science Foundation of China [20100480214] |
| 源URL | [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. |
入库方式： OAI收割
来源：植物研究所
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