Your search for keyword(s) "decline" resulted in 3 record(s).

Title: Aspen, elk, and fire: The effects of human institutions on ecosystem processes: Journal: BioScience; Authors: A. Hessl; Date: 2002; Summary: Hessl synthesized and compared current hypotheses regarding aspen decline by focusing on studies of aspen in the elk winter ranges of Rocky Mountain National Park (RMNP), Jackson Hole (JH), and northern Yellowstone National Park (YNP). Hessl used tree-ring studies, performed in the last decade from the three elk winter ranges, to date aspen ramet recruitment episodes. Using age structures, he synthesized data on aspen recruitment by comparing major episodes of recruitment at decadal time scales with data on drought, fire history, and elk population history. The history of aspen recruitment ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Ungulate herbivory on Utah aspen: Assessment of long-term exclosures: Journal: Journal of Range Management; Authors: C. E. Kay, and D. L. Bartos; Date: 2000; Summary: The role of livestock grazing and big-game browsing in the decline of aspen (Populus tremuloides), in the Intermountain West, has long been questioned. Kay and Bartos measured all known aspen exclosures on the Dixie and Fishlike National Forests in south-central Utah to determine aspen stem dynamics, successional status, and understory species composition. Aspen within all total-exclusion plots successfully regenerated and developed multi-aged stems without the influence of fire or other disturbance. Aspen subjected to herbivory, mainly mule deer (Odocoileus h ...; Agrovoc Control Words: Riparian zones, Rangelands, Wildlife; View more details about this article

Title: Is aspen doomed?

Journal: Journal of Forestry

Authors: C. E. Kay

Date: 1997

Summary: Communities of aspen (Populus tremuloides) are deteriorating throughout the western United States. Many aspen stands contain old-age or single-age trees and have not successfully regenerated for 80 years or longer. Moreover, many western aspen stands are being replaced by shade-tolerant conifers. These changes are usually attributed to the fact that aspen is a seral species whose decline is due to fire suppression. Kay believes that this view is incorrect. He points out that aspen is not seral as researchers typically believe, because the species does not grow from se ...

Agrovoc Control Words: Riparian zones, Rangelands, Wildlife

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