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Burial increases seed longevity of two Artemisia tridentata (Asteraceae) subspecies

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dc.creator Wijayratne, Upekala C.
dc.creator Pyke, David A.
dc.date.accessioned 2012-05-10T17:18:06Z
dc.date.available 2012-05-10T17:18:06Z
dc.date.issued 2012-03
dc.identifier.citation Wijayratne, U. C., & Pyke, D. A. (2012, March). Burial increases seed longevity of two Artemisia tridentata (Asteraceae) subspecies. American Journal of Botany, 99(3), 438-447. doi:10.3732/ajb.1000477 en_US
dc.identifier.uri http://hdl.handle.net/1957/29092
dc.description.abstract • Premise of the study: Seed longevity and persistence in soil seed banks may be especially important for population persistence in ecosystems where opportunities for seedling establishment and disturbance are unpredictable. The fire regime, an important driver of population dynamics in sagebrush steppe ecosystems, has been altered by exotic annual grass invasion. Soil seed banks may play an active role in postfire recovery of the foundation shrub Artemisia tridentata, yet conditions under which seeds persist are largely unknown. • Methods: We investigated seed longevity of two Artemisia tridentata subspecies in situ by retrieving seed bags that were placed at varying depths over a 2 yr period. We also sampled naturally dispersed seeds in litter and soil immediately after seed dispersal and before flowering in subsequent seasons to estimate seed persistence. • Key results: After 24 mo, seeds buried at least 3 cm below the soil surface retained 30–40% viability whereas viability of seeds on the surface and under litter declined to 0 and < 11%, respectively. The density of naturally dispersed seeds in the seed bank was highly heterogeneous both spatially and temporally, and attrition varied significantly by region. • Conclusions: Our study suggests that Artemisia tridentata has the potential to form a short-term soil seed bank that persists longer than has been commonly assumed, and that burial is necessary for seed longevity. Use of seeding techniques that promote burial of some seeds to aid in formation of a soil seed bank may increase restoration potential. en_US
dc.description.sponsorship The authors thank Lava Lake Foundation, U.S. Joint Fire Science Program project #05-S-08, U.S. Geological Survey Forest and Rangeland Ecosystem Science Center Coordinated Intermountain Restoration Project, and the Botany and Plant Pathology Department of Oregon State University, Corvallis, Oregon, USA for funding this study. en_US
dc.language.iso en_US en_US
dc.publisher Botanical Society of America en_US
dc.relation.ispartofseries American Journal of Botany en_US
dc.relation.ispartofseries Vol. 99 no. 3 en_US
dc.subject Artemisia tridentata en_US
dc.subject nondeep physiological dormancy en_US
dc.subject restoration en_US
dc.subject seed burial en_US
dc.subject seed longevity en_US
dc.subject seed persistence en_US
dc.subject soil seed bank en_US
dc.title Burial increases seed longevity of two Artemisia tridentata (Asteraceae) subspecies en_US
dc.title.alternative Contribution 40 (Sagebrush Steppe Treatment Evaluation Project (SageSTEP)) en_US
dc.type Article en_US
dc.identifier.doi 10.3732/ajb.1000477

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