Abstract
Aspen clones of an aspen-dominated community in Southwestern Utah are declining, some having experienced high mortality coupled with in sufficient regeneration. The objectives of this study were to (I) determine if decadent, non-regenerating mature aspen stands could be regenerated through disturbance of the 111 auxin/cytokinin hormone relationship by clearcutting; (2) determine the extent of ungulate use of regenerating aspen ramets. Clearcuts were made in late summer of 2001 in 10 different clones that exhibited various levels of decline on a continuum from relatively healthy to extremely deteriorated. Nested wildlife/livestock exclosures were constructed in each clearcut plot, as well as in a corresponding uncut control plot. In the fall of 2002, regenerating suckers were counted. In addition, vigor and ungulate utilization of these suckers were measured in the wildlife and livestock exclosures, as well as in an unprotected portion of the clearcut and control plots. Regeneration of the clearcut plots ranged from none in the most decadent clones, to 75,000 stems/ha in the least decadent clone, and was significantly greater than the control plots. Vigor, as measured by height of the suckers, was 1.5 to 2.1 times greater in the clearcut plots than in the control plots. Seventy-three percent of the suckers in the unprotected portion of the plots were heavily browsed, while only 12% were not browsed. Successful regeneration of aspen clones is heavily dependent upon clone decadence. Unregulated browsing pressure may limit the clone’s ability to successfully restock and remain on the landscape.
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Claims 6
Claim · model-written summary
Clearcutting regenerated aspen clones to 75,000 stems/ha in the least decadent clone and none in the most decadent clones, with regeneration significantly greater than in control plots.
Verbatim
e0“Aspen clones of an aspen-dominated community in Southwestern Utah are declining”
e1“Regeneration of the clearcut plots ranged from none in the most decadent clones, to 75,000 stems/ha in the least decadent clone, and was significantly greater than the control plots”
Claim · model-written summary
Sucker vigour, measured as height, was 1.5 to 2.1 times greater in clearcut plots than in control plots.
Verbatim
e0“Aspen clones of an aspen-dominated community in Southwestern Utah are declining”
e2“Vigor, as measured by height of the suckers, was 1.5 to 2.1 times greater in the clearcut plots than in the control plots”
Claim · model-written summary
Seventy-three percent of suckers in the unprotected portion of the plots were heavily browsed.
Verbatim
e0“Aspen clones of an aspen-dominated community in Southwestern Utah are declining”
e3“Seventy-three percent of the suckers in the unprotected portion of the plots were heavily browsed, while only 12% were not browsed”
Claim · model-written summary
Only 12% of suckers in the unprotected portion of the plots were not browsed.
Verbatim
e0“Aspen clones of an aspen-dominated community in Southwestern Utah are declining”
e3“Seventy-three percent of the suckers in the unprotected portion of the plots were heavily browsed, while only 12% were not browsed”
Claim · model-written summary
Successful regeneration of aspen clones is heavily dependent upon clone decadence.
- Taxon
- aspen clonese5
- Material
- aspen clonese5
- Outcome
- Successful regeneratione5
- Qualifier
- heavily dependent upon clone decadencee5
Not reportedDirection
Verbatim
e5“Successful regeneration of aspen clones is heavily dependent upon clone decadence”
Claim · model-written summary
Unregulated browsing pressure may limit the ability of aspen clones to restock and remain on the landscape (hypothesis).
Verbatim
e0“Aspen clones of an aspen-dominated community in Southwestern Utah are declining”
e6“Unregulated browsing pressure may limit the clone’s ability to successfully restock and remain on the landscape”