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Accueil du site → Master → Etats Unis → 1999 → Restoring sagebrush-dominated riparian corridors using seedling establishment to demonstrate alternative stable states

University of Nevada, Reno (1999)

Restoring sagebrush-dominated riparian corridors using seedling establishment to demonstrate alternative stable states

Linnerooth, Amy Ruth

Titre : Restoring sagebrush-dominated riparian corridors using seedling establishment to demonstrate alternative stable states

Auteur : Linnerooth, Amy Ruth

Université de soutenance : University of Nevada, Reno

Grade : Master of Science (MS) 1999

Résumé
In the western U.S., degradation of riparian corridors has led to the dominance of the native perennial shrub, Artemisia tridentata tridentata. We used two environmentally similar ecosystem types, the dry graminoid and A. tridentata tridentata/Leymus cinereus trough drainageways, as models for examining the potential restoration of sagebrush dominated sites to the dry graminoid alternative stable state. The restoration experiment involved three water table levels and a paired-plot restoration treatment in which half received a prescribed burn and half served as the control. Burning resulted in higher soil temperatures, higher levels of extractable nutrients and higher soil water availability at deeper depths. Seedling emergence and survival was highest on sites with high water tables, during high precipitation years, and for species adapted to drier conditions. Our results indicate that sites with high water tables have not crossed a threshold and can potentially be restored to dry graminoid states.

Mots clés : Leymus cinereus, Artemisia tridentata, Range management, Biological sciences

Accès au document : Proquest Dissertations & Theses

Page publiée le 22 avril 2015, mise à jour le 8 septembre 2018