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United States Department of Agriculture (USDA) 2018

PRECIPITATION INTENSITY EFFECTS ON DRYLAND WHEAT AND SAFFLOWER VARIETIES

Precipitation Dryland Wheat

United States Department of Agriculture (USDA) National Institute of Food and Agriculture

Titre : PRECIPITATION INTENSITY EFFECTS ON DRYLAND WHEAT AND SAFFLOWER VARIETIES

Identification : UTA-01404

Pays : Etats Unis

Durée : START : 01 JUL 2018 // TERM : 30 JUN 2023

Résumé
With each degree Celsius increase in temperature, air holds roughly seven percent more water vapor. A consequence of this physical process is that as the air warms, precipitation events become fewer, but larger. This effect has been observed over the past 100 years in many parts of the world including northern Utah. Changes in precipitation intensity are particularly important in semi-arid systems where plant productivity can double in wet years. Many experiments have tested the effects of increasing or decreasing total precipitation, but relatively little is known about the effects of increasing precipitation intensity. The few studies that have examined the effects of precipitation intensity have produced variable results. In some cases, intense events can increase plant productivity by increasing water infiltration into the soil. In other cases, intense events can decrease plant productivity by increasing runoff. Experiments are needed to better parameterize models of water flow and plant productivity under various climate conditions to determine when increased precipitation intensity will increase plant productivity and when it will decrease plant productivity. Results from two current studies in northern Utah highlight this need. One experiment in a rangeland site increased soil water infiltration and shrub growth, while another experiment in a dryland agricultural site increased soil water infiltration but decreased winter wheat growth. The fact that some species in the area increased growth under increased precipitation intensity, while other species decreased growth, suggests that it may be possible to identify dryland crop varieties that respond positively rather than negatively to observed and anticipated precipitation patterns. Here we propose to test the effects of increased precipitation intensity on three varieties of winter wheat and two varieties of safflower to identify plant varieties that can best convert large precipitation events into crop production. Experimental results will be used to parameterize and test predictions of an ecohydrological model that can be used to predict how different crop varieties are likely to respond to anticipated climate condition

Performing Institution : UTAH STATE UNIVERSITY LOGAN, UTAH 84322
Investigator : Kulmatiski, AN, .

Présentation : USDA (REEIS) ]

Page publiée le 13 décembre 2019, mise à jour le 25 novembre 2021