干旱区生态环境知识资源中心(Arid): Earlier fall precipitation and low severity fire impacts on cheatgrass and sagebrush establishment

Arid

DOI	10.1002/ecs2.3019
	Earlier fall precipitation and low severity fire impacts on cheatgrass and sagebrush establishment
	Bishop, Tara B. B.1,2; Nusink, Baylie C.1; Molinari, Rebecca Lee 1; Taylor, Justin B.1; St Clair, Samuel B.1
通讯作者	St Clair, Samuel B.
来源期刊	ECOSPHERE
ISSN	2150-8925
出版年	2020
卷号	11 期号:1
英文摘要	In arid and semiarid ecosystems, invasion by exotic grasses may be driving state changes in vegetation defined by losses of native shrub communities. Changes in wildfire regimes and fall precipitation timing related to climate change may promote fluctuations in resource availability that reinforces invasion and state changes in vegetation. The objective of this study was to investigate how earlier fall precipitation timing and fire affected the germination, establishment, and growth of the dominant native shrub Wyoming big sagebrush (Artemisia tridentata subsp. wyomingensis), and one of the most problematic invaders, cheatgrass (Bromus tectorum L.) in the Great Basin. We extracted soil cores from Rush Valley, Utah (UT), USA, on the eastern side of the Great Basin ecoregion and placed them in a common garden in Provo, UT, and planted seeds of sagebrush and cheatgrass in individual cores. We measured the response of sagebrush and cheatgrass to experimental fire and two fall precipitation timing pulses in a full factorial design. Water was added for two weeks in early September (early fall treatment) and mid-October (late fall treatment). We measured seedling emergence, plant height, biomass, density, seed production, and survival. Early fall precipitation did not significantly affect the amount of cheatgrass or sagebrush seedling emergence. Early fall precipitation significantly increased cheatgrass density, height, biomass, and seed production, and sagebrush height and biomass, but not density. Surprisingly, cheatgrass did not respond positively to fire. In contrast, fire increased sagebrush density (twofold) and survival. These findings indicate that fire can have positive impacts on sagebrush establishment. The data suggest that projected increases in fall moisture in the Great Basin due to climate change are likely to have positive impacts on both cheatgrass and sagebrush. However, additional studies are needed to identify how fall precipitation timing and fire might impact competitive interactions between sagebrush and cheatgrass and the bearing on invasion success at influencing state changes in the Great Basin.
英文关键词	Artemisia tridentata Bromus tectorum cheatgrass climate change invasion precipitation wildfire Wyoming big sagebrush
类型	Article
语种	英语
国家	USA
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000533913600025
WOS关键词	BIOLOGICAL SOIL CRUSTS ; BROMUS-TECTORUM L ; ARTEMISIA-TRIDENTATA ; COMMUNITY INVASIBILITY ; CLIMATE VARIABILITY ; GERMINATION ; INVASION ; DESERT ; RESISTANCE ; VEGETATION
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
来源机构	United States Geological Survey
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318490
作者单位	1.Brigham Young Univ, Dept Plant & Wildlife Sci, Provo, UT 84602 USA; 2.US Geol Survey, Southwest Biol Sci Ctr, Moab, UT USA
推荐引用方式 GB/T 7714	Bishop, Tara B. B.,Nusink, Baylie C.,Molinari, Rebecca Lee,et al. Earlier fall precipitation and low severity fire impacts on cheatgrass and sagebrush establishment[J]. United States Geological Survey,2020,11(1).
APA	Bishop, Tara B. B.,Nusink, Baylie C.,Molinari, Rebecca Lee,Taylor, Justin B.,&St Clair, Samuel B..(2020).Earlier fall precipitation and low severity fire impacts on cheatgrass and sagebrush establishment.ECOSPHERE,11(1).
MLA	Bishop, Tara B. B.,et al."Earlier fall precipitation and low severity fire impacts on cheatgrass and sagebrush establishment".ECOSPHERE 11.1(2020).