Abstract/Details

Causes and management of exotic riparian plant invasion in Canyon de Chelly National Monument, Arizona


2009 2009

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Abstract (summary)

The ecological, economic and social impacts of invasive plant species on native plant communities have stimulated broad concern among researchers, land managers and the general public. Riparian areas are of particular concern because they are critical to regional biodiversity despite covering a small percentage of the landscape. In the southwestern United States (U.S.), the most dominant riparian plant invaders are the woody species tamarisk ( Tamarix ramosissima Ledebour, T. chinensis Loureiro, and their hybrids) and Russian olive (Elaeagnus angustifolia L.). Tamarisk and Russian olive have invaded riparian habitats throughout Canyon de Chelly National Monument in northeastern Arizona. The goals of my research were to: (1) describe the history and mechanisms of exotic plant invasion into Canyon de Chelly, (2) understand the establishment niche space requirements of tamarisk, Russian olive and native cottonwood in terms of light and water and determine if tamarisk and cottonwood are facilitating the invasion of Russian olive, and (3) describe response of the riparian ecosystem to exotic plant removal and determine the effectiveness of two different removal strategies. My results from analyzing the history of invasion showed that although plantings and river regulation by dams probably played a role in tamarisk and Russian olive invasion into Canyon de Chelly, these species required hydroclimatic drivers and stream bed adjustments for wide-spread establishment. Controlled experiments and field surveys in my second study demonstrated that Russian olive is exploiting empty niches along wide gradients of water and light availability in southwestern riparian ecosystems. However, Russian olive invasion does appear to be limited by seed dispersal. Finally, I found that both cut-stump and whole plant removals similarly reduced exotic species cover and increased native species cover after two years. Both removal methods also reduced aerial seed rain inputs of tamarisk seeds, cut-stump removals increased available nitrogen near dead Russian olive boles within two years of removal, and both treatments seem to have no effect on ground water levels. This research can guide the management of riparian plant communities in Canyon de Chelly, across the southwestern U.S., and inform our understanding of exotic plant invasions.

Indexing (details)


Subject
Ecology;
Natural Resource Management
Classification
0329: Ecology
0528: Natural Resource Management
Identifier / keyword
Health and environmental sciences; Biological sciences; Eleaegnus angustifolia; Exotic plants; Invasive species; Riparian plants; Tamarix ramosissima
Title
Causes and management of exotic riparian plant invasion in Canyon de Chelly National Monument, Arizona
Author
Reynolds, Lindsay V.
Number of pages
130
Publication year
2009
Degree date
2009
School code
0053
Source
DAI-B 71/03, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781109676860
Advisor
Cooper, David J.
University/institution
Colorado State University
University location
United States -- Colorado
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3401009
ProQuest document ID
304861912
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304861912
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