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| DOI：10.13522/j.cnki.ggps.2017.0569 |
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| Effects of Light Intensity on Water Consumption of Spring Maize |
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CAO Yong, ZHANG Jianfeng, LI Tao, SHENG Yabin
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1. State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area， Xi’an University of Technology， Xi’ an 710048, China；2. Shaanxi Key Laboratory of Water Resources and Environment， Xi’ an 710048, China
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| Abstract: |
| 【Objective】 The purpose of this paper is to experimentally elucidate how water consumption of spring maize changes with light intensity. 【Method】 The experiment was conducted in a field consisting of four treatments: No shading (LCK), 38% shading (L38), 55% shading (L55) and 77% shading (L77). In each treatment, soil water content, soil evaporation and leaf area index were measured. 【Result】 Water content in 0~40 cm soil increased as the light intensity decreased and compared to LCK, L77, L55 and L38 increased the water content in 0~40 cm soil by 7.93%, 5.54% and 4.95% respectively during the growing season of the maize. Soil evaporation decreased as the maize grew and the average daily soil evaporation in L38, L55 and L77 was 9.17%, 19.62% and 29.34% lower than that in LCK respectively. The evapotranspiration varied between 345.1 mm and 386.7 mm, decreasing as the light intensity decrease, with the evapotranspiration in L38, L55 and L77 being 3.3%, 9.3% and 10.8% less than that in LCK. In the same treatment, evapotranspiration varied temporally, peaking at jointing and milking stage, with the water consumed during this period accounting for 59.8% of the total evapotranspiration. 【Conclusion】 Decrease in light intensity can effectively reduce soil evaporation and hence water consumption of the plants. |
| Key words: spring maize; light intensity; growth period; evapotranspiration; soil evaporation |
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