Arid
Trajectories of change in sagebrush steppe vegetation communities in relation to multiple wildfires
Davies, G. M.1; Bakker, J. D.1; Dettweiler-Robinson, E.1; Dunwiddie, P. W.1; Hall, S. A.2; Downs, J.3; Evans, J.4
通讯作者Davies, G. M.
来源期刊ECOLOGICAL APPLICATIONS
ISSN1051-0761
EISSN1939-5582
出版年2012
卷号22期号:5页码:1562-1577
英文摘要

Repeated perturbations, both biotic and abiotic, can lead to fundamental changes in the nature of ecosystems, including changes in state. Sagebrush steppe communities provide important habitat for wildlife and grazing for livestock. Fire is an integral part of these systems, but there is concern that increased ignition frequencies and invasive species are fundamentally altering them. Despite these issues, the majority of studies of fire effects in systems dominated by Artemisia tridentata wyomingensis have focused on the effects of single burns. The Arid Lands Ecology Reserve (ALE), in south-central Washington (USA), was one of the largest contiguous areas of sagebrush steppe habitat in the state until large wildfires burned the majority of it in 2000 and 2007. We analyzed data from permanent vegetation transects established in 1996 and resampled in 2002 and 2009. Our objective was to describe how the fires, and subsequent postfire restoration efforts, affected communities’ successional pathways. Plant communities differed in response to repeated fire and restoration; these differences could largely be ascribed to the functional traits of the dominant species. Lowelevation communities, previously dominated by obligate seeders, moved furthest from their initial composition and were dominated by weedy, early-successional species in 2009. Higher-elevation sites with resprouting shrubs, native bunchgrasses, and few invasive species were generally more resilient to the effects of repeated disturbances. Shrub cover has been almost entirely removed from ALE, although there was some recovery where communities were dominated by resprouters. Bromus tectorum dominance was reduced by herbicide application in areas where it was previously abundant, but it increased significantly in untreated areas. Several resprouting species, notably Phlox longifolia and Poa secunda, expanded remarkably following competitive release from shrub canopies and/or abundant B. tectorum. Our results suggest that community dynamics can be understood through a state and transition model with two axes (shrub/grass and native/invasive abundance), although such models also need to account for differences in plant functional traits and disturbance regimes. We use our results to develop a conceptual model that will be validated with further research.


英文关键词Arid Lands Ecology Reserve Artemisia tridentata Bromus tectorum fire effects Hanford Reach National Monument herbicide native seeding nonmetric multidimensional scaling PERMANOVA repeated disturbance restoration state and transition model
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000306650400015
WOS关键词BIG SAGEBRUSH ; BROMUS-TECTORUM ; GREAT-BASIN ; TRANSITION MODELS ; PRESCRIBED FIRES ; RESTORATION ; DYNAMICS ; ECOSYSTEMS ; STATE ; SUCCESSION
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
来源机构Arizona State University
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172015
作者单位1.Univ Washington, Sch Environm & Forest Sci, Seattle, WA 98195 USA;
2.Nature Conservancy, Wenatchee, WA 98801 USA;
3.Pacific NW Natl Lab, Richland, WA 99352 USA;
4.Nature Conservancy, Seattle, WA 98101 USA
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GB/T 7714
Davies, G. M.,Bakker, J. D.,Dettweiler-Robinson, E.,et al. Trajectories of change in sagebrush steppe vegetation communities in relation to multiple wildfires[J]. Arizona State University,2012,22(5):1562-1577.
APA Davies, G. M..,Bakker, J. D..,Dettweiler-Robinson, E..,Dunwiddie, P. W..,Hall, S. A..,...&Evans, J..(2012).Trajectories of change in sagebrush steppe vegetation communities in relation to multiple wildfires.ECOLOGICAL APPLICATIONS,22(5),1562-1577.
MLA Davies, G. M.,et al."Trajectories of change in sagebrush steppe vegetation communities in relation to multiple wildfires".ECOLOGICAL APPLICATIONS 22.5(2012):1562-1577.
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