紫外辐射增加对小麦产量及产量形成的影响

Effect of Enhanced UV-B Radiation on Wheat Yield and Yield Formation

紫外辐射增加能显著降低小麦产量，对经济系数无显著影响，但生物产量显著下阵。其原因主要是由于群体叶面积指数（ＬＡＩ）下降造成．而净同化率变化趋势不明显。紫外辐射增加导致生物产量下降的关键时期为拔节－孕穗期．而对拔节前的干物质生产影响最小。

Enhanced UV-B radiation significantly decreased the wheat bio-productivity and yield, but not the economic coefficient The decrease of bio-productivity mainly resulted from the decrease of LAI, but not the net assimilation rate, the sensitive period of the decrease of bio-productivity affected by enhanced UV-B radiation was not from elongation stage to ear pregnant stage.