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sur le développement des zones arides et semi-arides

Accueil du site → Master → Etats Unis → 1993 → Estimating and modelling stemflow and throughfall on creosote (Larrea tridentata) in an arid environment

New Mexico State University (1993)

Estimating and modelling stemflow and throughfall on creosote (Larrea tridentata) in an arid environment

Rice, Patricia May

Titre : Estimating and modelling stemflow and throughfall on creosote (Larrea tridentata) in an arid environment

Auteur : Rice, Patricia May

Université de soutenance : New Mexico State University

Grade : Master of Science (M S) 1993

Résumé
Creosote bush (Larrea tridentata) is one of the most common plants in the desert southwestern United States. The purpose of this study was to estimate stemflow and throughfall percentages, try to predict stemflow values, observe whether or not dryfall adds significantly to the ionic nutrients in stemflow, and to explore the relationship between branch angle and percentage of stemflow in an arid environment. To address these concerns several methods including calculating percentages, multiple regression, and paired t-tests were employed. It was found that the average stemflow rate was 16.8 percent while the average throughfall rate was 64.7 percent. The multiple regression produced several important variables in predicting stemflow including mean branch angle, mean branch length, total branch surface area, and canopy area. It seemed obvious during the analysis that several important variables were not included since they were unavailable. It was shown that dryfall does add significantly to the ionic nutrients in stemflow, especially nitrogen which is the most important nutrient for desert plants. No highly significant relationships was found in this study between branch angle and percentage of stemflow

Mots Clés : Larrea,stemflow model, model,Larrea,stemflow, model,Larrea,throughfall, nutrients,Larrea,stemflow, stemflow, shrub

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