Exotic Brome-Grasses in Arid and Semiarid Ecosystems of the Western US
13 Fig. 2.1 Ecoregions of the western United States that are characterized by distinct temperature and soil moisture regimes and ...
14 and defi ne ecological niche space (Davis et al. 2000 ; Miller et al. 2013 ; Chambers et al. 2014a , b , 2015 ). Site occurre ...
15 Fig. 2.2 ( a ) Annual minimum temperature, ( b ) annual maximum temperature, and ( c ) annual precipitation for site location ...
16 high resistance to Bromus. These data suggest that Bromus may be fi rmly estab- lished at the relatively lower precipitation ...
17 B. diandrus in the Plants Database. Thus, where we reference B. arvensis or B. diandrus throughout this chapter we are also r ...
18 Bromus rubens is the most ubiquitous Bromus species in the Warm Deserts ecoregion. It can occur in all but the most hyperther ...
19 appear in lower elevation areas with locally higher soil moisture such as riparian zones and roadsides (Brooks 2009 ), it onl ...
20 type. Saltbush scrub is dominated by one or more Atriplex species, including Atriplex polycarpa (Torr.) S. Watson (cattle sal ...
21 B. rubens were almost twice as high as those of B. tectorum (Klinger et al. 2011a ). The prevalence of B. rubens at lower and ...
22 by B. rubens and land managers were concerned about the potential for recurrent fi re (Fig. 2.6a ) (Holmgren 1960 ; Brooks et ...
23 Bromus rubens has also been shown t o effectively compete with native annual (Brooks 2000 ; DeFalco et al. 2003 ) and perenni ...
24 Bromus in any ecosystem should consider the likely net response of the plant community and include effective contingency plan ...
25 2.3 Mediterranean California The central valley and surrounding foothills, coastal mountains, and coastal plains of Californi ...
26 perennial cover recovers more quickly. In a study of 250 chaparral sites (Keeley et al. 2008 ), B. madritensis cover was nega ...
27 Fire history plays a critical role in the prevalence of exotic grasses within shru- bland ecosystems of the region. Short int ...
28 that pollution alone can promote type conversion from shrubs to these grasses, but there is evidence that following a disturb ...
29 2.3.2 Ecosystem Threats to Mediterranean California from Bromus Bromus invasions have had a multitude of impacts in Mediterra ...
30 and native biodiversity in general. Bromus -dominated grasslands are depauperate in diversity of plant functional types and a ...
31 the bunch grass Nassella pulchra (Hitchc.) Barkworth (purple needlegrass) while reducing dominance of Bromus (Stahlheber and ...
32 2.4.1 Invasion Potential of Cold Deserts by Bromus Salt desert vegetation types typically occur at relatively low elevations ...
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