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Accueil du site → Master → Etats Unis → 1968 → Cover, soil, and microrelief characteristics which influence runoff on a desert grassland range

University of Arizona (1968)

Cover, soil, and microrelief characteristics which influence runoff on a desert grassland range

Hawkinson, Richard O.

Titre : Cover, soil, and microrelief characteristics which influence runoff on a desert grassland range

Auteur : Hawkinson, Richard O.

Université de soutenance : University of Arizona

Grade : Master of Science (1968)

Résumé
Analyses of variance ? linear and multiple linear regression analyses5, and path coefficient analysis were utilized to evaluate the effects of treatments, vegetative cover factors, soil characteristics, and microtopography on runoff from individual storms0 . During the summer of 1965, the experimental area was fenced, and 42, 20- x 20-foot, plots were stakede Prior to the 1966 summer rainy season, VlOOO-acre runoff plots were constructed on 40 of the 42 plots and treatments applied* Clipping treatments removed vegetation to the following stubble heights : 5, 3, 2, 1^, and 1 inch* Ammonium nitrate and sodium chloride were also utilized as additional treatments on plots clipped at the 2-inch stubble height* Treatments were shown to have no significant effect on runoff* . Total overstory cover and herbage yield were the only two factors affected significantly by treatments* The simple linear and stepwise multiple linear regression analyses showed that percentage sand, depth of the A horizon, total overstory cover, and litter accounted for most variation in runoff* Storm intensity and amount influenced the amount of variation accounted for by each independent variable*

Mots clés : Runoff — Arizona. ; Rangelands — Research.

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Page publiée le 19 juin 2015, mise à jour le 14 décembre 2017