Effects of shelter tubes on hardwood tree establishment in western Oregon silvopastures |
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Authors: | Steven H Sharrow |
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Institution: | (1) Department of Rangeland Resources, Oregon State University, Corvallis, OR 97331, USA |
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Abstract: | Honey locust (Gleditsia triacanthos), black locust (Robinia pseudoacacia), and honey mesquite (Prosopis glandulosa) are warm season forage trees with potential to efficiently share site resources with cool season pasture plants in Pacific
Northwest silvopastures. Establishment of hardwood trees can be difficult, however, because of feeding damage from wildlife
and livestock. This study compared establishment and growth of trees planted in 88 cm tall solid plastic shelter tubes to
88 cm tall plastic mesh tubes, used to protect trees from animal damage. Three replications were established in May 1995 for
each of the three tree species on a hill pasture near Corvallis, Oregon. Initial tree survival during the first summer and
winter following planting was higher in shelter tubes than in mesh tubes. At the end of the third growing season, 58% of black
locust and 94% of honey locust trees in shelter tubes were still alive compared to only 14% of black locust and 47% of honey
locust in mesh tubes. Few honey mesquite trees survived regardless of tube type used. Average three-year total height growth
for black locust was increased by 650% and basal diameter growth by 380% within shelter tubes, while honey locust height growth
was increased by 300% and diameter growth was increased by 150% compared to trees in mesh tubes. However, shelter tube trees
tended to be taller relative to their diameter and had difficulty standing upright if tubes were removed.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | browsing Gleditsia triacanthos Prosopis glandulosa Robinia pseudoacacia tree protection vexar |
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