Arid
DOI10.1111/gcb.12032
Global change effects on Bromus tectorum L. (Poaceae) at its high-elevation range margin
Concilio, Amy L.1; Loik, Michael E.1; Belnap, Jayne2
通讯作者Concilio, Amy L.
来源期刊GLOBAL CHANGE BIOLOGY
ISSN1354-1013
EISSN1365-2486
出版年2013
卷号19期号:1页码:161-172
英文摘要

Global change is likely to affect invasive species distribution, especially at range margins. In the eastern Sierra Nevada, California, USA, the invasive annual grass, Bromus tectorum, is patchily distributed and its impacts have been minimal compared with other areas of the Intermountain West. We used a series of in situ field manipulations to determine how B. tectorum might respond to changing climatic conditions and increased nitrogen deposition at the high-elevation edge of its invaded range. Over 3 years, we used snow fences to simulate changes in snowpack, irrigation to simulate increased frequency and magnitude of springtime precipitation, and added nitrogen (N) at three levels (0, 5, and 10 g m(-2)) to natural patches of B. tectorum growing under the two dominant shrubs, Artemisia tridentata and Purshia tridentata, and in intershrub spaces (INTR). We found that B. tectorum seedling density in April was lower following deeper snowpack possibly due to delayed emergence, yet there was no change in spikelet production or biomass accumulation at the time of harvest. Additional spring rain events increased B. tectorum biomass and spikelet production in INTR plots only. Plants were primarily limited by water in 2009, but colimited by N and water in 2011, possibly due to differences in antecedent moisture conditions at the time of treatments. The threshold at which N had an effect varied with magnitude of water additions. Frequency of rain events was more influential than magnitude in driving B. tectorum growth and fecundity responses. Our results suggest that predicted shifts from snow to rain could facilitate expansion of B. tectorum at high elevation depending on timing of rain events and level of N deposition. We found evidence for P-limitation at this site and an increase in P-availability with N additions, suggesting that stoichiometric relationships may also influence B. tectorum spread.


英文关键词arid cheatgrass Great Basin Desert invasive species nitrogen deposition rainfall frequency sagebrush steppe snow to rain shifts snowpack stress-gradient hypothesis
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000312155100013
WOS关键词CLIMATE-CHANGE ; ECOSYSTEMS ; PULSES ; FIRE ; INVASIONS ; PHENOLOGY ; EMISSIONS ; RESPONSES ; DYNAMICS ; IMPACTS
WOS类目Biodiversity Conservation ; Ecology ; Environmental Sciences
WOS研究方向Biodiversity & Conservation ; 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/2XILL650/177431
作者单位1.Univ Calif Santa Cruz, Dept Environm Studies, Santa Cruz, CA 95064 USA;
2.US Geol Survey, SW Biol Sci Ctr, Moab, UT 84532 USA
推荐引用方式
GB/T 7714
Concilio, Amy L.,Loik, Michael E.,Belnap, Jayne. Global change effects on Bromus tectorum L. (Poaceae) at its high-elevation range margin[J]. United States Geological Survey,2013,19(1):161-172.
APA Concilio, Amy L.,Loik, Michael E.,&Belnap, Jayne.(2013).Global change effects on Bromus tectorum L. (Poaceae) at its high-elevation range margin.GLOBAL CHANGE BIOLOGY,19(1),161-172.
MLA Concilio, Amy L.,et al."Global change effects on Bromus tectorum L. (Poaceae) at its high-elevation range margin".GLOBAL CHANGE BIOLOGY 19.1(2013):161-172.
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