Western juniper in eastern Oregon.

Gedney, Donald R.; Azuma, David L.; Bolsinger, Charles L.; McKay, N.

doi:10.2737/pnw-gtr-464

Cited by 51 publications

(58 citation statements)

References 10 publications

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“…High-density stands of pinyon pine and juniper usually received between 35 -40 cm of precipitation (Tueller and Clark 1975). In Oregon >50% of western juniper stands occurred in areas where annual precipitation was between 25 -40 cm (Gedney et al 1999). …”

Section: Status and Trends Of Sagebrush Ecosystems 7 -11mentioning

confidence: 99%

Broad-Scale Assessment of Rangeland Health, Grand Staircase–Escalante National Monument, USA

Miller

2008

Rangeland Ecology & Management

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Section: Status and Trends Of Sagebrush Ecosystems 7 -11mentioning

confidence: 99%

Broad-Scale Assessment of Rangeland Health, Grand Staircase–Escalante National Monument, USA

Miller

2008

Rangeland Ecology & Management

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“…2 Woodlands are defined as having a tree canopy cover of > 10%, stands with < 10% tree canopy cover are defined as savannas (Gedney et al 1999).…”

Section: Study Areamentioning

confidence: 99%

“…occidentalis Vasek 1 ) occupies approximately 3.2 million ha (Bolsinger 1989, Gedney et al 1999 in southeastern Washington, eastern Oregon, northeastern California, southwestern Idaho, and northwestern Nevada. In the literature, communities typically reported to contain old-growth are described as open juniper shrub savannas occurring on shallow rocky soils or growing along rimrock (Holmes et al 1986, Miller andRose 1995).…”

Section: Introductionmentioning

confidence: 99%

Community characteristics of old-growth western juniper woodlands

Waichler¹,

Miller²,

Doescher³

2001

REM

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While considerable attention has been given to the areal expansion of juniper (Juniperus sp.) in the western United States, the presence and ecological significance of old-growth juniper communities has gone largely unnoted. Increased recognition of these communities has prompted questions about how to recognize oldgrowth, community structure, ecological importance, and appropriate management. As an initial analysis of old-growth western juniper woodlands (Juniperus occidentalis Hook var. occidentalis Vasek) in central Oregon, this study investigated old-growth community structure on eolian-sand derived soils. These woodlands represent the most extensive old-growth western juniper woodlands throughout its range. Nine study plots were established at 7 sites. Within each plot, densities and physical attributes of all live trees and large standing and fallen woody detritus were recorded. Additional measurements for live trees included canopy cover, apparent age class (pre-or postsettlement), and a sampling of tree ages. Aging of trees older than 250 years was complicated by extensive heartwood rot. Shrub density and cover were measured by species. Understory cover was measured by species and functional type. Bare ground, rock, juniper litter, other litter, moss, and cryptogamic crust cover were also measured. Plant cover ranged from 11 to 33% for trees, 0 to 10% for shrubs, 3 to 12% for perennial grasses, 1 to 2% for forbs, and from 0 to 0.1% for annual grasses. The woodlands contained at least 80 trees ha -1 aged over 200 years. Correlations between tree parameters and understory structure and composition were generally poor. Differences in plant composition among these stands was primarily attributed to elevation, slope, and percent sand content. Structural characteristics that distinguished old-growth stands from younger stands included tree growth form, presence of standing and dead large woody debris, lichen on dead branches, and a relatively open canopy. Results provide a preliminary basis for identifying old-growth Juniperus occidentalis stands, as a prelude to the development of management plans and further research into the functional characteristics of the systems. A definition of old-growth juniper woodlands is presented.

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“…It is most dominant in central and eastern Oregon, where it occupies approximately two million hectares (Gedney et al 1999), but the species extends into portions of Washington, southeast Idaho, northeast California, and Nevada . It is long-lived (>1600 yr) and exhibits high resilience to environmental perturbations, because it has high drought tolerance ) and disease resistance (Knapp and Soulé 1999).…”

Section: Introductionmentioning

confidence: 99%

Impacts of an Extreme Early-Season Freeze Event in the Interior Pacific Northwest (30 October–3 November 2002) on Western Juniper Woodlands

Knapp

Soulé

2005

Journal of Applied Meteorology

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In mid-autumn 2002, an exceptional 5-day cold spell affected much of the interior Pacific Northwest, with minimum temperatures averaging 13°C below long-term means (1953-21)112). On 31 October, minimum temperature records occurred at 98 of the 106 recording stations, with records lowered in some locations by 9°C. Calculation of recurrence intervals of minimum temperatures shows that 50%% of the stations experienced a >500-yr event. The synoptic conditions responsible were the development of a pronounced high pressure ridge over western Canada and an intense low pressure area centered in the Intermountain West that promoted strong northeasterly winds. The cold spell occurred near the end of the growing season for an ecologically critical and dominant tree species of the interior Pacific Northwest--western juniper--and followed an extended period of severe drought. In spring 2003, it became apparent that the cold had caused high rates of tree mortality and canopy dieback in a species that is remarkable for its longevity and resistance to climatic stress. The cold event altered western juniper dominance in some areas, and this alteration may have long-tern impacts on water budgets, fire intensities and frequencies, animal species interrelationships, and interspecific competition among plant species.

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Western juniper in eastern Oregon.

Abstract: Gedney, Donald R.; Azuma, David L.; Bolsinger, Charles L.; McKay, Neil. 1999.

Cited by 51 publications

References 10 publications

Broad-Scale Assessment of Rangeland Health, Grand Staircase–Escalante National Monument, USA

Broad-Scale Assessment of Rangeland Health, Grand Staircase–Escalante National Monument, USA

Community characteristics of old-growth western juniper woodlands

Impacts of an Extreme Early-Season Freeze Event in the Interior Pacific Northwest (30 October–3 November 2002) on Western Juniper Woodlands

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