工业废水对黄瓜幼苗生长及叶片抗氧化系统的影响

在自然条件下,通过增加不同强度的紫外线-B(UV-B)辐射,对宁夏地区春小麦叶片光合速率日变化和水分利用效率进行了研究。研究发现经增加R1强度(0.5 W/m2)UV-B辐射处理的春小麦净光合速率、蒸腾速率、气孔导度和水分利用效率比对照分别下降了19.0%、9.8%、22.7%和10.2%,而经增加R2强度(1.0 W/m2)UV-B辐射处理的春小麦净光合速率、蒸腾速率、气孔导度和水分利用效率比对照分别下降了48.8%、19.5%、53.6%和36.3%。表明,在自然条件下,春小麦叶片的光合作用随UV-B辐射增强而减小,水分利用效率也随之降低。

Effects of enhanced ultraviolet-B radiation on diurnal variations of photosynthesis in spring wheat in Ningxia

Under natural conditions,the plants of spring wheat were exposed to different intensities of ultraviolet-B(UV-B) radiation and the diurnal variations of their photosynthetic rate and water use efficiency (WUE) were recorded in Ningxia.Compared to the control group,the photosynthetic rate,transpiration rate,stomatal conductivity and water use efficiency was reduced by 19.0%,9.8%,22.7% and 12.1%,respectively,in the plants subjected to R1 dose UV-B radiation(0.5 W/m~2),and by 48.8%,19.5%,53.6% and 37.2%,respectively,in the plants subjected to R2 dose UV-B radiation(1.0 W/m~2).These results indicated that,within the range of UV-B radiation intensity used in this study,the photosynthesis and WUE of spring wheat tended to reduce with the enhancement of UV-B radiation intensity.