Arid
DOI10.1111/j.1654-1103.2010.01196.x
Shrubs as ecosystem engineers in a coastal dune: influences on plant populations, communities and ecosystems
Cushman, J. Hall; Waller, Jeffrey C.; Hoak, Derek R.
通讯作者Cushman, J. Hall
来源期刊JOURNAL OF VEGETATION SCIENCE
ISSN1100-9233
出版年2010
卷号21期号:5页码:821-831
英文摘要

Question


How do two shrubs with contrasting life-history characteristics influence abundance of dominant plant taxa, species richness and aboveground biomass of grasses and forbs, litter accumulation, nitrogen pools and mineralization rates? How are these shrubs - and thus their effects on populations, communities and ecosystems - distributed spatially across the landscape?


Location


Coastal hind-dune system, Bodega Head, northern California.


Methods


In each of 4 years, we compared vegetation, leaf litter and soil nitrogen under canopies of two native shrubs - Ericameria ericoides and the nitrogen-fixing Lupinus chamissonis - with those in adjacent open dunes.


Results


At the population level, density and cover of the native forb Claytonia perfoliata and the exotic grass Bromus diandrus were higher under shrubs than in shrub-free areas, whereas they were lower under shrubs for the exotic grass Vulpia bromoides. In contrast, cover of three native moss species was highest under Ericameria and equally low under Lupinus and shrub-free areas. At community level, species richness and aboveground biomass of herbaceous dicots was lower beneath shrubs, whereas no pattern emerged for grasses. At ecosystem level, areas beneath shrubs accumulated more leaf litter and had larger pools of soil ammonium and nitrate. Rates of nitrate mineralization were higher under Lupinus, followed by Ericameria and then open dune. At landscape level, the two shrubs - and their distinctive vegetation and soils - frequently had uniform spatial distributions, and the distance separating neighbouring shrubs increased as their combined sizes increased.


Conclusions


Collectively, these data suggest that both shrubs serve as ecosystem engineers in this coastal dune, having influences at multiple levels of biological organization. Our data also suggest that intraspecific competition influenced the spatial distributions of these shrubs and thus altered the distribution of their effects throughout the landscape.


英文关键词Ecosystem engineers Litter accumulation Nitrogen pools and mineralization rates Spatial patterns Species richness and biomass production
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000281551000002
WOS关键词SPECIES RICHNESS ; PRIMARY SUCCESSION ; TALLGRASS PRAIRIE ; QUERCUS-DOUGLASII ; DESERT SHRUBS ; CALIFORNIA ; NITROGEN ; PRODUCTIVITY ; FACILITATION ; COMPETITION
WOS类目Plant Sciences ; Ecology ; Forestry
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Forestry
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/165518
作者单位Sonoma State Univ, Dept Biol, Rohnert Pk, CA 94928 USA
推荐引用方式
GB/T 7714
Cushman, J. Hall,Waller, Jeffrey C.,Hoak, Derek R.. Shrubs as ecosystem engineers in a coastal dune: influences on plant populations, communities and ecosystems[J],2010,21(5):821-831.
APA Cushman, J. Hall,Waller, Jeffrey C.,&Hoak, Derek R..(2010).Shrubs as ecosystem engineers in a coastal dune: influences on plant populations, communities and ecosystems.JOURNAL OF VEGETATION SCIENCE,21(5),821-831.
MLA Cushman, J. Hall,et al."Shrubs as ecosystem engineers in a coastal dune: influences on plant populations, communities and ecosystems".JOURNAL OF VEGETATION SCIENCE 21.5(2010):821-831.
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