Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/eco.260 |
Ecohydrological interactions in a degraded two-phase mosaic dryland: implications for regime shifts, resilience, and restoration | |
King, Elizabeth G.1; Franz, Trenton E.2; Caylor, Kelly K.3 | |
通讯作者 | King, Elizabeth G. |
来源期刊 | ECOHYDROLOGY
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ISSN | 1936-0584 |
EISSN | 1936-0592 |
出版年 | 2012 |
卷号 | 5期号:6页码:733-745 |
英文摘要 | In the semi-arid rangelands of north central Kenya, the abundance of grasses has declined over recent decades. Concomitantly, the native succulent herb Sansevieria volkensii has greatly proliferated in many areas. Landscape structure has thus shifted from contiguous herbaceous cover to large, dense stands of S. volkensii with interpatches of bare or sparsely vegetated ground. Local pastoralists view this transition as highly undesirable; understanding the mechanisms and reversibility of the transition is necessary to develop management options. Because water availability is a key driver in this dryland ecosystem, we assessed the ecohydrological dynamics that may govern the vegetative spread of S. volkensii patches in a communal landholding in Laikipia District, Kenya. We assessed surface water flow patterns, soil moisture, S. volkensii proliferation, and adjacent vegetation density along the margins of dense patches of S. volkensii. We found that run-on zones along patch margins had greater soil moisture than runoff zones following a rain event. These run-on zones also had significantly higher S. volkensii ramet density, more new ramets, and greater leaf water content. New ramet density was negatively affected by the density of adjacent interpatch vegetation. We interpret these findings in the context of scale-dependent feedbacks and the cusp catastrophe model of ecosystem transitions. We hypothesize that the amount and spatial heterogeneity of plant available moisture governs the reversibility of transitions in this system and discuss the implications of this finding for management and restoration. Copyright (c) 2011 John Wiley & Sons, Ltd. |
英文关键词 | semi-arid rangeland degradation scale-dependent feedback pattern formation cusp catastrophe model threshold Sansevieria volkensii Kenya |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000312296900005 |
WOS关键词 | SEMIARID GRAZING SYSTEMS ; ARID ECOSYSTEMS ; VEGETATION PATTERNS ; TERRESTRIAL ECOSYSTEMS ; GLOBAL DESERTIFICATION ; CATASTROPHIC SHIFTS ; DYNAMICS ; LANDSCAPE ; RUNOFF ; DEGRADATION |
WOS类目 | Ecology ; Environmental Sciences ; Water Resources |
WOS研究方向 | Environmental Sciences & Ecology ; Water Resources |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/172010 |
作者单位 | 1.Princeton Univ, Dept Ecol & Evolutionary Biol, Princeton, NJ 08544 USA; 2.Univ Arizona, Dept Hydrol & Water Resources, Tucson, AZ 85721 USA; 3.Princeton Univ, Dept Civil & Environm Engn, Princeton, NJ 08544 USA |
推荐引用方式 GB/T 7714 | King, Elizabeth G.,Franz, Trenton E.,Caylor, Kelly K.. Ecohydrological interactions in a degraded two-phase mosaic dryland: implications for regime shifts, resilience, and restoration[J]. University of Arizona,2012,5(6):733-745. |
APA | King, Elizabeth G.,Franz, Trenton E.,&Caylor, Kelly K..(2012).Ecohydrological interactions in a degraded two-phase mosaic dryland: implications for regime shifts, resilience, and restoration.ECOHYDROLOGY,5(6),733-745. |
MLA | King, Elizabeth G.,et al."Ecohydrological interactions in a degraded two-phase mosaic dryland: implications for regime shifts, resilience, and restoration".ECOHYDROLOGY 5.6(2012):733-745. |
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