Knowledge Resource Center for Ecological Environment in Arid Area
| DOI | 10.1002/eco.2039 |
| Roots point to water sources of Welwitschia mirabilis in a hyperarid desert | |
| Henschel, Joh R.1,2,3; Wassenaar, Theo D.1; Kanandjembo, Angie4; Louw, Michele Kilbourn4; Neef, Gotz1; Shuuya, Titus1; Soderberg, Keir5,6 | |
| 通讯作者 | Henschel, Joh R. |
| 来源期刊 | ECOHYDROLOGY
 |
| ISSN | 1936-0584 |
| EISSN | 1936-0592 |
| 出版年 | 2019 |
| 卷号 | 12期号:1 |
| 英文摘要 | Welwitschia mirabilis is a long-lived evergreen in the hyperarid Namib Desert; at our study site, rainfall is rare (mean annual precipitation = 31 mm), groundwater deep (57-75 m), and fog frequent (50-90 events per year). By examining root architecture in relation to soil moisture and analysing the isotopic composition of hydrogen and oxygen of plant and soil water, we established whether welwitschia sources water from a stable supply of deep groundwater, or from shallow moisture originating from fog and dew, or from rainwater at infiltration depth. Isotopes suggested rainwater as principal water source. Most (55%) major roots and fine roots occurred in 10- to 66-cm-deep layers of gypsum containing 10% moisture. A further 25% of both root types grew in moist sand in petrocalcic horizons at 93- to 125-cm depths. A high density of fine roots (14% of total) grew upwards towards the ground surface in a 1.5-m radius around plants, an area occasionally wetted by run-off of fog and dew. We conclude that welwitschia mainly relies on rainwater obtained in perched horizons. Supplemental water is obtained from fog and dew from the surface and potentially from gypsum blocks. Multiple strategies enable this extremely long-lived evergreen to be resilient against dehydration in hyperarid conditions. |
| 英文关键词 | fog gypsum long-lived broadleaved evergreen perched water petrocalcic horizon resilience to drought stress root map |
| 类型 | Article |
| 语种 | 英语 |
| 国家 | Namibia ; South Africa ; USA |
| 收录类别 | SCI-E |
| WOS记录号 | WOS:000454601400003 |
| WOS关键词 | CENTRAL NAMIB DESERT ; HOOK FIL ; PLANT ; SOIL ; GYPSUM ; GROWTH ; ISOTOPES ; PATTERNS ; FOG ; VEGETATION |
| WOS类目 | Ecology ; Environmental Sciences ; Water Resources |
| WOS研究方向 | Environmental Sciences & Ecology ; Water Resources |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/215128 |
| 作者单位 | 1.Gobabeb Res & Training Ctr, Namib Ecol Restorat & Monitoring Unit, Walvis Bay, Namibia; 2.South African Environm Observat Network, Arid Lands Node, Kimberley, South Africa; 3.Univ Free State, Ctr Environm Management, Bloemfontein, South Africa; 4.Swakop Uranium, Safety Hlth & Environm Risks, Swakopmund, Namibia; 5.Princeton Univ, Dept Civil & Environm Engn, Princeton, NJ 08544 USA; 6.SS Papadopulos & Associates Inc, Geochem, Bethesda, MD USA |
| 推荐引用方式 GB/T 7714 | Henschel, Joh R.,Wassenaar, Theo D.,Kanandjembo, Angie,et al. Roots point to water sources of Welwitschia mirabilis in a hyperarid desert[J],2019,12(1). |
| APA | Henschel, Joh R..,Wassenaar, Theo D..,Kanandjembo, Angie.,Louw, Michele Kilbourn.,Neef, Gotz.,...&Soderberg, Keir.(2019).Roots point to water sources of Welwitschia mirabilis in a hyperarid desert.ECOHYDROLOGY,12(1). |
| MLA | Henschel, Joh R.,et al."Roots point to water sources of Welwitschia mirabilis in a hyperarid desert".ECOHYDROLOGY 12.1(2019). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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