【作者】 苏占胜； 王连喜； 李福生； 黄建伟；

【Author】 SU Zhan-sheng1,2 WANG Lian-xi1,3 LI Fu-sheng3 HUANG Jian-wei3 (1.Ningxia Key Laboratory for Disaster Prevention and Reduction,Yinchuan 750002,China;2.Ningxia Meteorological Observatory,Yinchuan 750002, China;3.Ningxia Meteorological institute,Yinchuan 750002,China)

【机构】 宁夏气象防灾减灾重点实验室； 宁夏气象科学研究研所；

【摘要】 在自然条件下,通过增加不同强度的UV-B辐射,对宁夏地区玉米叶片光合速率日变化和水分利用效率进行了研究。发现经增加R1强度(0.5w.m-2)UV-B辐射处理的玉米净光合速率、蒸腾速率、气孔导度和水分利用效率比对照分别下降了57.1%、15.6%、11.0%和49.3%,而经增加R2强度(1.0w.m-2)UV-B辐射处理的玉米净光舍速率、蒸腾速率、气孔导度和水分利用效率比对照分别下降了67.5%、18.8%、24.8%和60.6%。这表明,在自然条件下,玉米叶片的光合作用随UV-B辐射增强而减小,水分利用效率也随之降低。更多还原

【Abstract】 Under natural conditions, the plants of corn were exposed to different intensities of ultraviolet-B (UV-B) radiation and the diurnal variations in their photosynthetic rate and water use efficiency(WUE) were recorded in Ningxia.Compared to the control group the photosynthetic rate, transpiration rate, stoma conductivity and water use efficiency reduced by 57.1%,15.6%,11.0% and 49.3%,respectively,in plants subjected to R1 dose UV-B radiation(0.5w.m-2 ) and by 67.5%,18.8%,24.8% and 60.6% in plants subjected to R2 dose UV-B radiation(1.0w.m-2 ). Such results indicated that within the range of UV-B radiation intensity used in this study,photosynthesis and WUE of corn reduced with UV-B radiation intensity under natural conditions.更多还原