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First‐Year Responses of Cheatgrass Following Tamarix spp. Control and Restoration‐Related Disturbances
Author(s) -
Sher Anna A.,
Gieck Stephanie,
Brown Cynthia S.,
Nissen Scott J.
Publication year - 2008
Publication title -
restoration ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.214
H-Index - 100
eISSN - 1526-100X
pISSN - 1061-2971
DOI - 10.1111/j.1526-100x.2008.00355.x
Subject(s) - bromus tectorum , tamarix , riparian zone , understory , biology , invasive species , ecology , triclopyr , introduced species , weed control , agronomy , habitat , canopy
Current invasion ecology theory predicts that disturbance will stimulate invasion by exotic plant species. Cheatgrass or Downy brome ( Bromus tectorum ) was surveyed in three sites near Florence, Colorado, U.S.A., immediately following Tamarisk or Saltcedar ( Tamarix spp.) control and restoration activities that caused disturbance. Despite predictions to the contrary, neither mowing with heavy machinery nor tilling for seedbed preparation stimulated invasion, with a trend for the opposite pattern such that highest percent cover of B. tectorum was observed in the least disturbed transects. Aerial application of imazapyr for Tamarix spp. control caused mortality of nearly all B. tectorum and other understory plant species in all sites. Mechanical control of Tamarix spp. will not necessarily result in increased abundance of invasive species already present, possibly due to the effects of mulch usually left on‐site. Imazapyr will control B. tectorum and other herbaceous understory species when applied aerially for Tamarix spp. control. These results are encouraging for managers of riparian systems who may fear that control of woody invasives will stimulate herbaceous invasions.