| 引用本文: | 曹勇,张建丰,李涛,等.不同控光条件对春玉米耗水规律的影响[J].灌溉排水学报,2018,37(12):10-18. |
| CAO Yong,ZHANG Jianfeng,LI Tao,et al.不同控光条件对春玉米耗水规律的影响[J].灌溉排水学报,2018,37(12):10-18. |
|
| 摘要: |
| 【目的】探究不同光照强度对春玉米耗水的影响。【方法】以自然光的强度为对照（LCK），在遮光度分别为38%（L38）、55%（L55）、77%（L77）条件下进行了大田试验，测定了不同控光条件下春玉米全生育期土壤水分分布特征、棵间蒸发、叶面积指数与耗水量的变化规律。【结果】控光条件下春玉米0~40 cm土壤水分分布受影响较大，随着控光程度的增加，土壤水分增加，全生育期，L77、L55、L38处理0~40 cm土层土壤含水率较LCK分别提高7.93%、5.54%、4.95%；春玉米日棵间蒸发强度随生长历时呈变小的趋势，全生育期L38、L55、L77处理平均日棵间蒸发强度较LCK处理分别减小9.17%、19.62%、29.34%；全生育期，春玉米耗水量在345.1~386.7 mm之间，随着光照强度减小，春玉米耗水量减小，L38、L55、L77比LCK减少3.3%、9.3%、10.8%；不同生育阶段春玉米耗水量不同，拔节期与乳熟期为主要耗水阶段，共占总耗水量的59.8%以上。【结论】控光条件有效减少了土壤水分消耗，降低春玉米棵间蒸发量，从而减少春玉米耗水。 |
| 关键词: 春玉米； 控光； 生育期； 耗水； 棵间蒸发 |
| DOI：10.13522/j.cnki.ggps.2017.0569 |
| 分类号: |
| 基金项目: |
|
| Effects of Light Intensity on Water Consumption of Spring Maize |
|
CAO Yong, ZHANG Jianfeng, LI Tao, SHENG Yabin
|
|
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
|
| 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 |
