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Seasonal Water Potential Changes in Sonoran Desert Shrubs in Relation to Topography

William L. Halvorson and Duncan T. Patten
Ecology
Vol. 55, No. 1 (Jan., 1974), pp. 173-177
Published by: Wiley
DOI: 10.2307/1934632
Stable URL: http://www.jstor.org/stable/1934632
Page Count: 5
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Seasonal Water Potential Changes in Sonoran Desert Shrubs in Relation to Topography
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Abstract

Water potential in Sonoran Desert shrubs was recorded from September 1968 through September 1969. Special attention was paid to recording maximum and minimum potentials on a seasonal basis and diurnal fluctuations during the wettest and driest periods of the year. Franseria deltoidea developed the lowest potential (-85 bar) of the shrubs recorded and also showed the greatest degree of response to changes in soil moisture on a seasonal basis and evaporative power of the air on a diurnal basis. Of the species tested, Eriogonum fasciculatum showed a high degree of response to changing conditions; Larrea tridentata, Krameria gravi, and Simmondsia chinesis showed a moderate response; and Cercidium microphyllum showed only a slight response to diurnal or seasonal changes.

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