Seasonal response of bitterbrush to burning and clipping in eastern Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5m60qw418

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  • Bitterbrush [Purshia tridentata (Pursh) DC] plants were burned or clipped, fall and spring, under different soil moisture conditions on two sites in east-central Oregon. Treatments, on plants of an erect growth form on the Juniperus/Artemisia-Purshia site resulted in 38% of the fall-clipped and 40% of the spring-clipped plants sprouting. None of the unwatered fall-burned plants sprouted, nor did any of the fall- burned plants that were watered 24 hours prior to burning. Ten percent of the plants that were watered after fall-burning and 30% of the spring-burned plants sprouted. On the Pinus/Purshia site treatments on plants of a lower-growing, decumbent form of bitterbrush resulted in 69% of the fall-clipped and 90% of the spring-clipped plants sprouting. None of the unwatered, fall-burned plants sprouted although 20% of the plants watered prior to fall-burning and 10% of the plants watered after fall- burning sprouted. Fifty percent of the spring-burned plants sprouted. Within sites, sprouting of clipped plants on either site did not appear to be related to plant size, age, or soil moisture. Burning was more damaging on both sites than clipping and fall-burning more damaging than spring-burning.
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