Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1890/03-0568 |
Ecohydrological control of deep drainage in arid and semiarid regions | |
Seyfried, MS; Schwinning, S; Walvoord, MA; Pockman, WT; Newman, BD; Jackson, RB; Phillips, EM | |
通讯作者 | Seyfried, MS |
来源期刊 | ECOLOGY
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ISSN | 0012-9658 |
出版年 | 2005 |
卷号 | 86期号:2页码:277-287 |
英文摘要 | The amount and spatial distribution of deep drainage (downward movement of water across the bottom of the root zone) and groundwater recharge affect the quantity and quality of increasingly limited groundwater in arid and semiarid regions. We synthesize research from the fields of ecology and hydrology to address the issue of deep drainage in and and semiarid regions. We start with a recently developed hydrological model that accurately simulates soil water potential and geochemical profiles measured in thick (>50 m), unconsolidated vadose zones. Model results indicate that, since the climate change that marked the onset of the Holocene period 10000-15000 years ago, there has been no deep drainage in vegetated interdrainage areas and that continuous, relatively low (<-1 MPa) soil water potentials have been maintained at depths of 2-3 m. A conceptual model consistent with these results proposes that the native, xeric-shrub-dominated, plant communities that gained dominance during the Holocene generated and maintained these conditions. We present three lines of ecological evidence that support the conceptual model. First, xeric shrubs have sufficiently deep rooting systems with low extraction limits to generate the modeled conditions. Second, the characteristic deep-rooted soil-plant systems store sufficient water to effectively buffer deep soil from climatic fluctuations in these dry environments, allowing stable conditions to persist for long periods of time. And third, adaptations resulting in deep, low-extraction-limit rooting systems confer significant advantages to xeric shrubs in and and semiarid environments. We then consider conditions in arid and semiarid regions in which the conceptual model may not apply, leading to the expectation that portions of many arid and semiarid watersheds supply some deep drainage. Further ecohydrologic research is required to elucidate critical climatic and edaphic thresholds, evaluate the role of important physiological processes (Such as hydraulic redistribution), and evaluate the role of deep roots in terms of carbon costs, nutrient uptake, and whole-plant development. |
英文关键词 | deep drainage ecohydrology groundwater recharge xeric shrubs |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000227634400002 |
WOS关键词 | PLANT FUNCTIONAL TYPE ; DESERT VADOSE ZONES ; SOIL-WATER ; ROOTING DEPTH ; MOJAVE DESERT ; ARTEMISIA-TRIDENTATA ; VEGETATION CHANGE ; UNSATURATED FLOW ; HYDRAULIC LIFT ; SONORAN DESERT |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | United States Geological Survey |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/148862 |
作者单位 | (1)USDA, ARS, NW Watershed Res Ctr, Boise, ID 83712 USA;(2)Biosphere 2 Ctr, Oracle, AZ 85623 USA;(3)US Geol Survey, Denver Fed Ctr, Lakewood, CO 80225 USA;(4)Univ New Mexico, Dept Biol, Albuquerque, NM 87131 USA;(5)Los Alamos Natl Lab, Los Alamos, NM 87545 USA;(6)Duke Univ, Dept Biol, Durham, NC 27708 USA;(7)New Mexico Inst Min & Technol, Dept Earth & Environm Sci, Socorro, NM 87801 USA |
推荐引用方式 GB/T 7714 | Seyfried, MS,Schwinning, S,Walvoord, MA,et al. Ecohydrological control of deep drainage in arid and semiarid regions[J]. United States Geological Survey,2005,86(2):277-287. |
APA | Seyfried, MS.,Schwinning, S.,Walvoord, MA.,Pockman, WT.,Newman, BD.,...&Phillips, EM.(2005).Ecohydrological control of deep drainage in arid and semiarid regions.ECOLOGY,86(2),277-287. |
MLA | Seyfried, MS,et al."Ecohydrological control of deep drainage in arid and semiarid regions".ECOLOGY 86.2(2005):277-287. |
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