Arid
DOI10.1016/j.jaridenv.2008.12.020
Effects of fire and environmental variables on plant structure and composition in grazed salt desert shrublands of the Great Basin (USA)
Haubensak, K.; D’Antonio, C.; Wixon, D.
通讯作者Haubensak, K.
来源期刊JOURNAL OF ARID ENVIRONMENTS
ISSN0140-1963
EISSN1095-922X
出版年2009
卷号73期号:6-7页码:643-650
英文摘要

Fire in shrub-dominated portions of the Great Basin. largely fueled by non-native annuals such as Bromus tectorum, has become an important structuring force altering vegetation composition and soil characteristics. The extent to which fire affects native species in drier portions of the Great Basin, termed salt desert, is poorly documented. We conducted a survey of grazed salt desert habitat in northwestern Nevada 5 years after wildfires burned 650,000 ha, with the goal of investigating community response to fire and factors correlating with post-fire recovery. We found that recruitment of a dominant shrub, Artemisia spinescens, is severely restricted following fire: it occurred in only 2 of the 24 burned sites. The co-dominant shrub, Atriplex confertifolia, occurred in most burned sites although on average its percent cover was one-third lower than adjacent unburned sites. Biotic soil crust cover was four times lower, and non-native species cover 5 times higher, in burned sites compared to unburned. Ordination analyses confirmed differences among plant communities in burned versus unburned sites, with environmental variables soil conductivity, plant litter, soil potassium (K+) and pH explaining 38% of the variance in community composition. However, we found no environmental predictors of recovery for native species in burned sites. Future recruitment is likely to be further limited, as fire frequency in the salt desert is expected to increase with invasion by non-native annual grasses and with global climate change. (C) 2009 Elsevier Ltd. All rights reserved.


英文关键词Cheatgrass Fire Grass/fire cycle Great Basin Invasion Non-native grasses Post-fire recovery Shrub recruitment
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000266298900008
WOS关键词BIOLOGICAL SOIL CRUSTS ; BROMUS-TECTORUM-L ; SEED BANKS ; DYNAMICS ; WILDFIRE ; GERMINATION ; CHEATGRASS ; VEGETATION ; SAGEBRUSH ; RECOVERY
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/2XILL650/161351
作者单位USDA ARS, Exot & Invas Weeds Res Unit, Reno, NV 89512 USA
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Haubensak, K.,D’Antonio, C.,Wixon, D.. Effects of fire and environmental variables on plant structure and composition in grazed salt desert shrublands of the Great Basin (USA)[J],2009,73(6-7):643-650.
APA Haubensak, K.,D’Antonio, C.,&Wixon, D..(2009).Effects of fire and environmental variables on plant structure and composition in grazed salt desert shrublands of the Great Basin (USA).JOURNAL OF ARID ENVIRONMENTS,73(6-7),643-650.
MLA Haubensak, K.,et al."Effects of fire and environmental variables on plant structure and composition in grazed salt desert shrublands of the Great Basin (USA)".JOURNAL OF ARID ENVIRONMENTS 73.6-7(2009):643-650.
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