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Trigger duration(days) Rootelongation(mmperday)
 

Summary: Trigger duration(days)
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Rootelongation(mmperday)
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Trigger duration (days)
This study investigated initial seedling establishment the most vulnerable and tractable phase of the shrub life cycle. In
arid and semi-arid environments, rapid access to deeper soil moisture can be expected to be a key factor in woody plant
seedling survival and the spread of shrub and tree species into grasslands. Within typical environmental limits, taproot
elongation in young A. greggii and, especially, P. velutina seedlings was more responsive to triggering event duration than
subsequent watering, those responses being greater than expected due only to allometric increases with biomass.
Therefore, root depth can be expected to be more dependent on the magnitudes of the larger storms (triggering events) than
average wet season rainfall. Deeper soil moisture is less available to grasses and forbs and lasts longer into the dry season,

  

Source: Archer, Steven R. - Savanna/Woodland Ecology Lab., School of Natural Resources and the Environment, University of Arizona

 

Collections: Environmental Sciences and Ecology