On the run for water - Root growth of two phreatophytes in the Taklamakan Desert
文献类型：期刊论文
| 作者 | Vonlanthen ; B. ; Zhang ; X. ; Bruelheide ; H. |
| 刊名 | JOURNAL OF ARID ENVIRONMENTS
 |
| 出版日期 | 2010 |
| 卷号 | 74期号:12页码:1604-1615 |
| 关键词 | USE EFFICIENCY TRADE-OFFS VEGETATION MORPHOLOGY SEEDLINGS DROUGHT PLASTICITY ALLOCATION DEPTH AVAILABILITIES |
| ISSN号 | 0140-1963 |
| 通讯作者 | Vonlanthen, B, Univ Halle Wittenberg, Inst Biol Geobot & Bot Garden, Kirchtor 1, D-06108 Halle, Saale, Germany |
| 中文摘要 | Desert phreatophytes require extremely fast root growth for a successful establishment We measured the speed of seedling root growth of two phreatophytic plant species, Alhagi sparsifolia and Karelinia caspia, which form dominant or codominant stands around the river oases at the southern fringe of the Taklamakan Desert. As A sparsifolia occurs at sites with deeper groundwater, we expected the roots of this species to reach down more rapidly than those of K caspia. Furthermore, we expected seedlings experiencing no irrigation and low fertilization to have deeper reaching roots than seedlings with irrigation and fertilization. Seeds of both species were sown into 1 and 2 m long tubes in a glasshouse and in a field experiment, respectively. After 16 weeks of growth in the field roots of K. caspia and A. sparsifolia reached down 2 2 m and 1.7 m, respectively. In accordance with a faster growth, K. caspia had a higher water use, which resulted in a faster decrease of water content in the tubes. Species differences in the vertical reach of roots in the glasshouse experiment were comparable to those in the field experiment After 12 weeks without irrigation, A sparsifolia had a higher rooting depth (0.45 m) than with irrigation (0 30 m), while root depths of K caspia showed the opposite pattern with 062 m and 0 72 m, respectively Fertilizing increased total biomass of both species, while low level of fertilization had the tendency to increase the root shoot ratio and the specific root lengths (SRL), most likely a response to acquire nutrients at lower costs. However, plants of K. caspia showed an increase in SLR already after 12 weeks, while it took 16 weeks for A sparsifolia to increase SRL in the low fertilization level. Our results show clearly that both species are able to reach the groundwater table in the river valleys (6 5 m) within a time span of five to six months after germination However, the encountered vegetation pattern is probably not caused by differences in the speed of rooting depth, but might be the result of a higher capability of growing up with sand accumulation of A sparsifolia. As additional irrigation and fertilization did not enhance rooting depth in both species, these factors will have little impact in restoration procedures (C) 2010 Elsevier Ltd All rights reserved |
| 学科主题 | 植物生理学 |
| 收录类别 | SCI |
| 公开日期 | 2011-08-19 |
| 源URL | [http://ir.xjlas.org/handle/365004/9876]  |
| 专题 | 新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据) |
| 推荐引用方式 GB/T 7714 | Vonlanthen,B.,Zhang,et al. On the run for water - Root growth of two phreatophytes in the Taklamakan Desert[J]. JOURNAL OF ARID ENVIRONMENTS,2010,74(12):1604-1615. |
| APA | Vonlanthen,B.,Zhang,X.,Bruelheide,&H..(2010).On the run for water - Root growth of two phreatophytes in the Taklamakan Desert.JOURNAL OF ARID ENVIRONMENTS,74(12),1604-1615. |
| MLA | Vonlanthen,et al."On the run for water - Root growth of two phreatophytes in the Taklamakan Desert".JOURNAL OF ARID ENVIRONMENTS 74.12(2010):1604-1615. |
入库方式： OAI收割
来源：新疆生态与地理研究所
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