Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.jtbi.2010.12.028 |
Mechanisms of vegetation-ring formation in water-limited systems | |
Sheffer, Efrat1; Yizhaq, Hezi1; Shachak, Moshe1; Meron, Ehud1,2 | |
通讯作者 | Sheffer, Efrat |
来源期刊 | JOURNAL OF THEORETICAL BIOLOGY |
ISSN | 0022-5193 |
出版年 | 2011 |
卷号 | 273期号:1页码:138-146 |
英文摘要 | A common patch form in dryland landscapes is the vegetation ring. Vegetation patch formation has recently been attributed to self-organization processes that act to increase the availability of water to vegetation patches under conditions of water scarcity. The view of ring formation as a water-limited process, however, has remained largely unexplored. Using laboratory experiments and model studies we identify two distinct mechanisms of ring formation. The first mechanism pertains to conditions of high infiltration contrast between vegetated and bare soil, under which overland water flow is intercepted at the patch periphery. The decreasing amount of water that the patch core receives as the patch expands, leads to central dieback and ring formation. The second mechanism pertains to plants with large lateral root zones, and involves central dieback and ring formation due to increasing water uptake by the newly recruited individuals at the patch periphery. In general the two mechanisms act in concert, but the relative importance of each mechanism depends on environmental conditions. We found that strong seasonal rainfall variability favors ring formation by the overland-flow mechanism, while a uniform rainfall regime favors ring formation by the water-uptake mechanism. Our results explain the formation of rings by fast-growing species with confined root zones in a dry-Mediterranean climate, such as Poa bulbosa. They also explain the formation of rings by slowly growing species with highly extended root zones, such as Larrea tridentata (Creosotebush). (C) 2010 Elsevier Ltd. All rights reserved. |
英文关键词 | Central dieback Pattern formation Self-organization Mathematical model Poa bulbosa L. |
类型 | Article |
语种 | 英语 |
国家 | Israel |
收录类别 | SCI-E |
WOS记录号 | WOS:000287681300014 |
WOS关键词 | BANDED VEGETATION ; ROOT DISTRIBUTION ; PLANT COMMUNITY ; PATTERNS ; DESERT ; DYNAMICS ; SOIL ; PRODUCTIVITY ; COMPETITION ; POPULATION |
WOS类目 | Biology ; Mathematical & Computational Biology |
WOS研究方向 | Life Sciences & Biomedicine - Other Topics ; Mathematical & Computational Biology |
来源机构 | Ben-Gurion University of the Negev ; Hebrew University of Jerusalem |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/169481 |
作者单位 | 1.Ben Gurion Univ Negev, BIDR, Inst Dryland Environm Res, IL-84990 Sede Boqer, Israel; 2.Ben Gurion Univ Negev, Dept Phys, IL-84105 Beer Sheva, Israel |
推荐引用方式 GB/T 7714 | Sheffer, Efrat,Yizhaq, Hezi,Shachak, Moshe,et al. Mechanisms of vegetation-ring formation in water-limited systems[J]. Ben-Gurion University of the Negev, Hebrew University of Jerusalem,2011,273(1):138-146. |
APA | Sheffer, Efrat,Yizhaq, Hezi,Shachak, Moshe,&Meron, Ehud.(2011).Mechanisms of vegetation-ring formation in water-limited systems.JOURNAL OF THEORETICAL BIOLOGY,273(1),138-146. |
MLA | Sheffer, Efrat,et al."Mechanisms of vegetation-ring formation in water-limited systems".JOURNAL OF THEORETICAL BIOLOGY 273.1(2011):138-146. |
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