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Effects of Burial Depth and Substrate on the Emergence of Bromus rubens and Brassica tournefortii
 

Summary: Effects of Burial Depth and Substrate on the Emergence of
Bromus rubens and Brassica tournefortii
Scott R. Abella,1,2
Amber C. Lee,1
and Alexis A. Suazo1
1
School of Environmental and Public Affairs, University of Nevada Las Vegas,
Las Vegas, NV 89154-4030
Abstract.--The germination of seed is critical in deserts where annual plants are
abundant and rely on seed buried in the soil for sustaining populations. The exotic
annuals Bromus rubens and Brassica tournefortii threaten arid indigenous ecosystems
such as the Mojave Desert, but little is known about the potential effects on seed
emergence of different burial depths and substrates that could enhance or reduce
emergence. Using seed from Mojave Desert populations, we conducted a three-
factor greenhouse experiment testing the effects of species (Bromus or Brassica),
burial depth (0, 2, 5, or 10 cm), and substrate (none, gravel, or litter) on seed
emergence. Species and substrate interacted significantly with burial depth. Both
species displayed the greatest emergence when seeds were sown on the soil surface
(70% emergence for Bromus and 52% for Brassica), but Bromus emergence declined
less at a 2-cm depth than Brassica. Emergence of surface-sown seed did not differ

  

Source: Abella, Scott R. - School of Life Sciences, University of Nevada at Las Vegas

 

Collections: Environmental Sciences and Ecology