Life on the edge - to which degree does phreatic water sustain vegetation in the periphery of the Taklamakan Desert?
文献类型：期刊论文
| 作者 | Bruelheide ; Vonlanthen ; Jandt ; Thomas ; Foetzki ; Gries ; Wang ; Zhang ; Runge ; Helge ; Beatrix ; Ute ; Frank M. ; Andrea ; Dirk ; Gang ; Ximing ; Michael |
| 刊名 | APPLIED VEGETATION SCIENCE
 |
| 出版日期 | 2010 |
| 卷号 | 13期号:1页码:56-71 |
| 关键词 | LOWER REACHES TARIM RIVER NW CHINA PLANT-COMMUNITIES UNSATURATED ZONE SOUTHERN FRINGE NORTHWEST CHINA TRANSITION ZONE OASIS DEPTH |
| ISSN号 | 1402-2001 |
| 通讯作者 | Bruelheide, H, Univ Halle Wittenberg, Inst Biol Geobot, Kirchtor 1, DE-06108 Halle, Germany |
| 中文摘要 | Questions: Do the vegetation-specific patterns in the forelands of river oases of the Taklamakan Desert provide clues to the degree to which a vegetation type depends on unsaturated soil moisture, brought about by extensive floodings, or phreatic water? Location: Foreland of the Qira oasis on the southern rim of the Taklamakan Desert, Xinjiang Uygur Autonomous Region, China. Methods: A vegetation map was prepared using a SPOT satellite image and ground truthing. Measurements of soil water contents were obtained from a flooding experiment and transformed into water potentials. Sum excedance values were calculated as the percentage of days on which different thresholds of soil water potentials were transgressed. Groundwater depth was mapped by drilling 30 groundwater holes and extrapolating the distances to the whole study area. Results: The vegetation was characterized by only six dominant or codominant species: Alhagi sparsifolia, Karelinia caspia, Populus euphratica, Tamarix ramosissima, Calligonum caput-medusae and Phragmites australis. The vegetation patterns encountered lacked any linear features typical of phreatophytes, thus not allowing direct conclusions on the type of the sustaining water sources. Soil water potentials never transgressed a threshold of pF 5 (-10 MPa) in horizons above the capillary fringe during periods without inundation, thus representing water not accessible for plants. Depth to the groundwater ranged between 2.3 and 17.5 m among plots and varied between 1.7 and 8.0 m within a plot owing to dune relief. The seven main vegetation types showed distinct niches of groundwater depths, corresponding to the observed concentric arrangement of vegetation types around the oasis. Conclusions: Inundation by flooding and unsaturated soil moisture are irrelevant for the foreland vegetation water supply. Although distances to the groundwater table can reach about 20 m, which is exceptionally large for phreatophytes, groundwater is the only water source for all vegetation types in the oasis foreland. In consequence, successful maintenance of oasis foreland vegetation will crucially depend on providing non-declining ground water tables. |
| 收录类别 | SCI |
| 公开日期 | 2011-08-19 |
| 源URL | [http://ir.xjlas.org/handle/365004/10034]  |
| 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 | Bruelheide,Vonlanthen,Jandt,et al. Life on the edge - to which degree does phreatic water sustain vegetation in the periphery of the Taklamakan Desert?[J]. APPLIED VEGETATION SCIENCE,2010,13(1):56-71. |
| APA | Bruelheide.,Vonlanthen.,Jandt.,Thomas.,Foetzki.,...&Michael.(2010).Life on the edge - to which degree does phreatic water sustain vegetation in the periphery of the Taklamakan Desert?.APPLIED VEGETATION SCIENCE,13(1),56-71. |
| MLA | Bruelheide,et al."Life on the edge - to which degree does phreatic water sustain vegetation in the periphery of the Taklamakan Desert?".APPLIED VEGETATION SCIENCE 13.1(2010):56-71. |
入库方式： OAI收割
来源：新疆生态与地理研究所
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