Effects of drought stress and n supply on the growth, biomass partitioning and water-use efficiency of sophora davidii seedlings
文献类型：期刊论文
| 作者 | Wu, Fuzhong1,2; Bao, Weikai1; Li, Fanglan1,2; Wu, Ning1 |
| 刊名 | Environmental and experimental botany
 |
| 出版日期 | 2008-05-01 |
| 卷号 | 63期号:1-3页码:248-255 |
| 关键词 | Arid region Sophora davidii Adaptation Seedling establishment Water-use strategy N supply |
| ISSN号 | 0098-8472 |
| DOI | 10.1016/j.envexpbot.2007.11.002 |
| 通讯作者 | Wu, ning(wuning@cib.ac.cn) |
| 英文摘要 | A greenhouse experiment was conducted in order to understand the adaptation responses to different water and n conditions, and further explore if additional n supply could improve the water-use efficiency (wue) and adaptability of sophora davidii seedlings under dry conditions. two-month-old seedlings were subjected to a completely random design with three water (80,40 and 20% water field capacity (fc)) and three n supply (no: 0, ni: 92 and nh: 184 mg n kg(-1) soil) regimes. drought stress dramatically decreased seedlings height, basal diameter, leaf number, leaf area, root length, and biomass production. an increase in below-ground biomass was observed indicating a higher root/shoot ratio (r/s) under drought stress conditions, and drought further decreased relative water content (rwc) and wue. on the other hand, s. davidii seedlings exhibited strong responses to n supply, but the responses were inconsistent with the various n supply levels. low n supply (ni) increased seedlings height, basal diameter, leaf number, leaf area, and biomass production, but decreased root length. in contrast, high n supply (nh) decreased or had little effect on these growth characteristics. n supply increased leaf percentages, but decreased fine root percentages. in addition, ni rather than the other two n treatments increased leaf area ratio (lar), leaf/fine root mass ratio (l/fr), r/s and rwc under severe drought stress (20% fc), even though these parameters could increase with the nh treatment under well-watered condition (80% fc). moreover, ni also increased wue under three water conditions, but nh had little effect on wue under drought stress conditions (40% fc and 20% fc). the results suggested that water and n co-limited the growth of s. davidii seedlings, and the seedlings exhibited great positive responses to ni in this study. appropriate or low n supply, therefore, would be recommended to stimulate growth, enhance wue, alleviate drought stress, and consequently contribute to s. davidii seedling establishment under dry condition, but excess n supply should be avoided. (c) 2007 elsevier b.v. all rights reserved. |
| WOS关键词 | GAS-EXCHANGE ; NITROGEN LIMITATION ; CHIHUAHUAN DESERT ; PINUS-RADIATA ; SOIL ; RESPONSES ; FERTILIZATION ; PRECIPITATION ; PRODUCTIVITY ; CULTIVARS |
| WOS研究方向 | Plant Sciences ; Environmental Sciences & Ecology |
| WOS类目 | Plant Sciences ; Environmental Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000254671700027 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2386571 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Wu, Ning |
| 作者单位 | 1.Chinese Acad Sci, Inst Biol, Chengdu 610041, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, Fuzhong,Bao, Weikai,Li, Fanglan,et al. Effects of drought stress and n supply on the growth, biomass partitioning and water-use efficiency of sophora davidii seedlings[J]. Environmental and experimental botany,2008,63(1-3):248-255. |
| APA | Wu, Fuzhong,Bao, Weikai,Li, Fanglan,&Wu, Ning.(2008).Effects of drought stress and n supply on the growth, biomass partitioning and water-use efficiency of sophora davidii seedlings.Environmental and experimental botany,63(1-3),248-255. |
| MLA | Wu, Fuzhong,et al."Effects of drought stress and n supply on the growth, biomass partitioning and water-use efficiency of sophora davidii seedlings".Environmental and experimental botany 63.1-3(2008):248-255. |
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来源：中国科学院大学
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