Charles B. Halpern
University of Washington
UnderstoryVegetationEcologySpecies richnessBiology
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Publications 97
#1Keith B. AubryH-Index: 25
#2Charles B. HalpernH-Index: 35
#1Jessica CelisH-Index: 1
#2Charles B. Halpern (UW: University of Washington)H-Index: 35
Last. Ariel Muldoon (OSU: Oregon State University)H-Index: 1
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Woody-plant encroachment threatens the biodiversity and ecosystem functioning of grasslands and meadows worldwide. An important but rarely described consequence of the transition to woody-plant dominance is the reduction in flowering of herbaceous species. We modeled community-wide relationships between flowering and light in two tree-invaded meadows (BG and M1) in the western Cascade Range, Oregon (USA). At BG, trees established over two centuries, forming a gradient of encroachment states (ope...
#1Brendan J. Whyte (UW: University of Washington)H-Index: 1
#2Charles B. Halpern (UW: University of Washington)H-Index: 35
Abstract The practice of aggregated retention is becoming increasingly common in forests managed for multiple objectives (e.g., timber production and maintenance of biodiversity). Undisturbed patches of forest (aggregates) can serve as refugia for disturbance-sensitive species and as dispersal sources for recolonization of adjacent harvested areas. However, few studies have characterized the contributions of aggregates to the natural recruitment or height growth of regenerating trees. In this st...
2 CitationsSource
#1Charles B. Halpern (UW: University of Washington)H-Index: 35
#2Joseph A. Antos (UVic: University of Victoria)H-Index: 30
Last. Annette M. Olson (OSU: Oregon State University)H-Index: 6
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Woody‐plant encroachment represents a global threat to grasslands. Although the causes and consequences of this regime shift have received substantial attention, the processes that constrain reassembly of the grassland state remain poorly understood. We experimentally tested two potentially important controls on reassembly, the past influence of trees and the effects of fire, in conifer‐invaded grasslands (mountain meadows) of western Oregon. Previously, we had reconstructed the history of tree ...
1 CitationsSource
#1Cynthia C. Chang (UW: University of Washington)H-Index: 8
#2Charles B. Halpern (UW: University of Washington)H-Index: 35
Last. Donald B. Zobel (OSU: Oregon State University)H-Index: 18
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2 CitationsSource
#1Lauren S. Urgenson (UW: University of Washington)H-Index: 9
#2Cara R. Nelson (UM: University of Montana)H-Index: 19
Last. Ernesto Alvarado (UW: University of Washington)H-Index: 16
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Abstract Fuel-reduction treatments have been used effectively in dry, fire-adapted forests to reduce risk of high-severity crown fire, but it is less certain whether they achieve ecological objectives such as promoting understory diversity. Using long-term data from a fuel-reduction experiment, we tested how conclusions about treatment effectiveness are related to the spatial and temporal scales over which ecological responses are evaluated. We modeled the richness of herbs and shrubs at smaller...
5 CitationsSource
#1James E. Cook (UWSP: University of Wisconsin–Stevens Point)H-Index: 3
#2Charles B. Halpern (UW: University of Washington)H-Index: 35
We examine patterns of vegetative change in blown-down and scorched forests in the blast zone of Mount St. Helens (USA), 10–26 years after the eruption. We compare trends in community attributes in four post-eruption environments, or site types, defined by severity of disturbance, presence/absence of a protective snowpack at the time of eruption, and seral state (previously clearcut vs. mature/old forests). Permanent plots established in 1980 at 16 sites were sampled at 5- to 6-year intervals be...
3 CitationsSource
#1C. Alina Cansler (USFS: United States Forest Service)H-Index: 9
#2Donald McKenzie (USFS: United States Forest Service)H-Index: 35
Last. Charles B. Halpern (UW: University of Washington)H-Index: 35
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7 CitationsSource
#1Charles B. HalpernH-Index: 35
#2Joseph A. AntosH-Index: 1
Last. Annette M. OlsonH-Index: 6
view all 4 authors...