摘要
1材料与方法
1.1材料 供试玉米品种为“沈单16号”。
1．2试验设计 试验在宁夏永宁农业气象试验站进行，该站位于北纬38°15′、东经106°14′，海拔1116．7m；地处宁夏引黄灌区的中心地带，日照充足、干旱少雨，年降水量200mm左右，雨热同季，降水集中在夏秋；试验田地势平坦，30cm以上为沙壤土，30cm以下为壤土，微碱性，中等肥力，灌溉条件良好。试验时间为2004年和2005年4～9月。
[Objective] The experiment aimed to explore the influence of enhanced ultraviolet radiation-B on maize in arid regions of middle-high elevation for correct assessing the influence of enhanced ultraviolet radiation-B on maize and providing scientific reference to make proper countermeasures. [ Method] The location test in field and lift lamp of UV-B were used to observe the changes of maize height, leaf area and number of green leaves under influences of different UV-B radiation. [ Result] In arid regions of middle-high elevation, enhanced ultraviolet radiation-B could dwarf maize plant, decrease leaf area, decline number of green leaves and yield. The reason of decreasing leaf area was that enhanced ultraviolet radiation-B shortened leaf length and leaf width while the reason of declining yield was that yield components were all negatively influ- enced and with the increase of ultraviolet radiation-B, the yield declined dramatically. [ Concluslonl The result of this experiment would be good for maize production in arid regions of middle-high elevation.
基金
Supported by Natural Science Foundation of Ningxia Autonomous Re-gion(A1012)~~
