中文摘要：

在室外盆栽条件下研究了UV-B辐射和土壤干旱对春小麦和尚头生长和光合作用的影响.结果显示：（1）干旱、UV-B辐射、干旱＋UV-B（复合）处理均可使叶片类黄酮含量增加,且干旱＋UV-B处理增加显著高于其他处理（P〈0.05）.UV-B辐射和干旱单独处理均能显著降低叶片光合色素含量,但UV-B辐射的副作用大于干旱,复合处理对光合色素的影响介于UV-B和干旱之间.（2）各处理间的光合速率日均值大小次序为：对照〉UV-B＋干旱〉UV-B〉干旱;增强UV-B对净光合速率的抑制作用大于干旱,而UV-B＋干旱处理的抑制作用较二者单独处理有所减轻.（3）UV-B辐射和干旱单独处理后总生物量比对照减少15%,且抑制作用为：干旱〉UV-B〉复合处理;UV-B辐射和干旱胁迫不但影响春小麦的生物量,而且影响小穗特征和产量.研究表明,UV-B辐射和干旱之间存在交互作用,说明一种胁迫可以减缓（轻）另外一种胁迫对春小麦的抑制作用.

英文摘要：

The effects of enhanced UV-B radiation and soil drought on pigments contents,photosynthesis,biomass and yield of spring wheat were investigated under the field condition of pot cultivation.The radiation or drought,simply or combination,led to the decrease in foliar flavonoid content,but only there is statistically significant under the condition of the combination.Both stresses caused the reduction of chlorophyll a,chlorophyll b and carotenoids.Compared with water stress,the UV-B radiation had stronger role in inhibiting the pigments.Various treatments could inhibit the photosynthesis,and the ordination is controlcombinationUV-Bdrought.The total biomass and yield were averagely declined up to 15% comparison to control under UV-B or drought stress,the order from high to low was controlcombinationUV-Bdrought.The composition of spikes was also negatively impacted.The results showed that there were interactive between UV-B radiation and soil drought,suggesting that one stress factor might alleviate the inhibitory effect of another stress on spring wheat.