Search Results - "Halpern, Charles B"

Canopy closure exerts weak controls on understory dynamics: a 30-year study of overstory-understory interactions by Halpern, Charles B, Lutz, James A

“…Stem exclusion and understory reinitiation are commonly described, but poorly understood, stages of forest development. It is assumed that overstory trees…”
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Vegetation changes in blown-down and scorched forests 10–26 years after the eruption of Mount St. Helens, Washington, USA by Cook, James E., Halpern, Charles B.

“…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…”
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Testing conceptual models of early plant succession across a disturbance gradient by Chang, Cynthia C., Halpern, Charles B., Antos, Joseph A., Avolio, Meghan L., Biswas, Abir, Cook, James E., del Moral, Roger, Fischer, Dylan G., Holz, Andrés, Pabst, Robert J., Swanson, Mark E., Zobel, Donald B., Turner, Benjamin

“…Studies of succession have a long history in ecology, but rigorous tests of general, unifying principles are rare. One barrier to these tests of theory is the…”
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Level and pattern of overstory retention interact to shape long-term responses of understories to timber harvest by Halpern, Charles B, Halaj, Juraj, Evans, Shelley A, Dov iak, Martin

“…In many regions of the world, variable retention has replaced clear-cutlogging as the principal method of regeneration harvest. Partial retention of the…”
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Variable-retention harvests in the Pacific Northwest: A review of short-term findings from the DEMO study by Aubry, Keith B., Halpern, Charles B., Peterson, Charles E.

“…In the Pacific Northwest (PNW) region of the contiguous United States, retention of live (green) trees in harvest units is an integral part of forest…”
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A cross-continental comparison of plant and beetle responses to retention of forest patches during timber harvest by Baker, Susan C., Halpern, Charles B., Wardlaw, Timothy J., Kern, Christel, Edgar, Graham J., Thomson, Russell J., Bigley, Richard E., Franklin, Jerry F., Gandhi, Kamal J. K., Gustafsson, Lena, Johnson, Samuel, Palik, Brian J., Spies, Thomas A., Steel, E. Ashley, Weslien, Jan, Strengbom, Joachim

“…Timber harvest can adversely affect forest biota. Recent research and application suggest that retention of mature forest elements (retention forestry),…”
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Long-Term Effects of Fuels Treatments, Overstory Structure, and Wildfire on Tree Regeneration in Dry Forests of Central Washington by Allison K. Rossman, Jonathan D. Bakker, David W. Peterson, Charles B. Halpern

“…The long-term effectiveness of dry-forest fuels treatments (restoration thinning and prescribed burning) depends, in part, on the pace at which trees…”
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Uncertainty analysis: an evaluation metric for synthesis science by Harmon, Mark E, Fasth, Becky, Halpern, Charles B, Lutz, James A

“…The methods for conducting reductionist ecological science are well known and widely used. In contrast, those used in the synthesis of ecological science…”
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Spatially explicit modeling of overstory manipulations in young forests: Effects on stand structure and light by Sprugel, Douglas G., Rascher, Katherine G., Gersonde, Rolf, Dovčiak, Martin, Lutz, James A., Halpern, Charles B.

“…Young forests can be manipulated in diverse ways to enhance their ecological values. We used stem maps from two dense, second-growth stands in western…”
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Level and spatial pattern of overstory retention impose trade-offs for regenerating and retained trees by Halpern, Charles B., Urgenson, Lauren S.

“…Variable retention (VR) has been adopted globally as an alternative to more intensive forms of regeneration harvest. By retaining live trees within harvest…”
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Consequences of reduced light for flower production in conifer-invaded meadows of the Pacific Northwest, U.S.A by Celis, Jessica, Halpern, Charles B., Muldoon, Ariel

“…Woody-plant encroachment threatens the biodiversity and ecosystem functioning of grasslands and meadows worldwide. An important but rarely described…”
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Fire enhances the complexity of forest structure in alpine treeline ecotones by Cansler, C. Alina, McKenzie, Donald, Halpern, Charles B.

“…Alpine treelines are expected to move upward in a warming climate, but downward in response to increases in wildfire. We studied the effects of fire on…”
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Positive diversity-stability relationships in forest herb populations during four decades of community assembly by Dovčiak, Martin, Halpern, Charles B

“…Ecology Letters (2010) It is suggested that diversity destabilizes individual populations within communities; however, generalizations are problematic because…”
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Past tree influence and prescribed fire exert strong controls on reassembly of mountain grasslands after tree removal by Halpern, Charles B., Antos, Joseph A., Kothari, Shan, Olson, Annette M.

“…Woody-plant encroachment represents a global threat to grasslands. Although the causes and consequences of this regime shift have received substantial…”
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Level and pattern of overstory retention influence rates and forms of tree mortality in mature, coniferous forests of the Pacific Northwest, USA by Urgenson, Lauren S., Halpern, Charles B., Anderson, Paul D.

“…•We examined how level and spatial pattern of retention influence conifer mortality.•Mortality was greater at lower levels of retention and in dispersed…”
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Intraspecific trait variation and the differential decline of meadow species during conifer encroachment by Celis, Jessica, Halpern, Charles B., Jones, F. Andrew

“…Conifer encroachment has reduced the extent and habitat quality of mountain meadows throughout western North America. Past studies in the Cascade Range of…”
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Visions of Restoration in Fire-Adapted Forest Landscapes: Lessons from the Collaborative Forest Landscape Restoration Program by Urgenson, Lauren S., Ryan, Clare M., Halpern, Charles B., Bakker, Jonathan D., Belote, R. Travis, Franklin, Jerry F., Haugo, Ryan D., Nelson, Cara R., Waltz, Amy E.M.

“…Collaborative approaches to natural resource management are becoming increasingly common on public lands. Negotiating a shared vision for desired conditions is…”
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Tree mortality during early forest development: a long-term study of rates, causes, and consequences by Lutz, James A., Halpern, Charles B.

“…Tree mortality is a critical but understudied process in coniferous forest development. Current successional models assume that mortality during early forest…”
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Combining local- and large-scale models to predict the distributions of invasive plant species by Jones, Chad C., Acker, Steven A., Halpern, Charles B.

“…Habitat distribution models are increasingly used to predict the potential distributions of invasive species and to inform monitoring. However, these models…”
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Short- and long-term benefits for forest biodiversity of retaining unlogged patches in harvested areas by Baker, Susan C., Halpern, Charles B., Wardlaw, Timothy J., Crawford, Rodney L., Bigley, Richard E., Edgar, Graham J., Evans, Shelley A., Franklin, Jerry F., Jordan, Gregory J., Karpievitch, Yuliya, Spies, Thomas A., Thomson, Russell J.

“…•Plants, beetles and spiders respond largely independently to retention forestry.•Retaining unlogged patches benefits biodiversity over both the short-and…”
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