Arid
DOI10.1672/0277-5212(2007)27[831:RVOTSM]2.0.CO;2
Riparian vegetation of two semi-arid Mediterranean rivers: Basin-scale responses of woody and herbaceous plants to environmental gradients
Salinas, M. Jacoba; Casas, J. Jesus
通讯作者Salinas, M. Jacoba
来源期刊WETLANDS
ISSN0277-5212
EISSN1943-6246
出版年2007
卷号27期号:4页码:831-845
英文摘要

Mediterranean fluvial ecosystems are subjected to ever-increasing water demands and to a wide variety of other human impacts with potential negative effects on riparian vegetation. Nevertheless, few studies have compared the importance of human versus natural factors in structuring riparian vegetation in this region, particularly in semi-arid areas. We examined basin-scale responses of riparian vegetation to the main environmental gradient extracted by canonical correspondence analysis in two semi-arid Mediterranean rivers in southern Spain, considering different community attributes (woody, herbaceous, functional groups, and exotics species) and using different metrics (species composition, richness, and cover). The results show two main environmental gradients for riparian vegetation: a prime altitudinal gradient of increasing salinity towards the lower sites, and a second gradient of increasing water pollution and human physical impact parallel to the hydroperiod shortening. Species richness of woody and herbaceous life forms, and cover of woody species, reacted negatively to the increasing salinity downstream, a pattern that was driven by most functional groups. This is consistent with the key role of salinity for vegetation. Furthermore, as for other semi-arid riparian ecosystems, the decline in rainfall coupled with higher temperatures and evaporative stress at the lower elevation open-canopy sites may have constrained herbaceous species. Woody richness and cover declined with shorter hydroperiod and increasing human impacts, a response that was driven by mesic and hydric species. These results agree with the idea that surface flow permanence is an outstanding limiting factor for woody vegetation in semi-arid rivers, possibly exerting more influence on species richness than flood disturbance. However, herbs showed very little response to drought or human impacts compared to woody species, which may be related to the higher recovery rate from disturbance of herbaceous life forms, due to their shorter life-span and higher colonization rates. Generally, exotic species were positively affected by dissolved nutrients (N and P), especially exotic herbaceous richness and cover by nitrogen. As in other Mediterranean rivers, percentage richness of exotics in our rivers was substantially lower compared to fluvial ecosystems in other regions.


英文关键词exotic species fluvial ecosystem functional groups human and natural disturbances life forms salinity
类型Article
语种英语
国家Spain
收录类别SCI-E
WOS记录号WOS:000251471400006
WOS关键词SAN-PEDRO RIVER ; CANONICAL CORRESPONDENCE-ANALYSIS ; TAMARIX-RAMOSISSIMA SEEDLINGS ; POPULUS-FREMONTII ; DRYLAND RIVER ; FOREST LAYERS ; ALIEN PLANTS ; DISTURBANCE ; LANDSCAPE ; ARIZONA
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/156188
作者单位(1)Univ Almeria, Dept Biol Vegetal & Ecol, E-04120 Almeria, Spain
推荐引用方式
GB/T 7714
Salinas, M. Jacoba,Casas, J. Jesus. Riparian vegetation of two semi-arid Mediterranean rivers: Basin-scale responses of woody and herbaceous plants to environmental gradients[J],2007,27(4):831-845.
APA Salinas, M. Jacoba,&Casas, J. Jesus.(2007).Riparian vegetation of two semi-arid Mediterranean rivers: Basin-scale responses of woody and herbaceous plants to environmental gradients.WETLANDS,27(4),831-845.
MLA Salinas, M. Jacoba,et al."Riparian vegetation of two semi-arid Mediterranean rivers: Basin-scale responses of woody and herbaceous plants to environmental gradients".WETLANDS 27.4(2007):831-845.
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