克拉玛依农业开发区13个经济林树种叶绿素荧光特征比较

为揭示各树种耐光抑制能力的大小,测定比较了克拉玛依农业开发区13个经济林树种的叶绿素荧光参数,以便从光合机理角度筛选出耐光抑制且有发展前景的经济林树种。试验结果表明:综合比较各树种的叶绿素荧光参数值,李、蟠桃和中国沙棘耐光抑制能力强,为首选经济林树种,这3个树种最大光能转化效率F_v/F_m值全天都保持在0.8以上,最大光能转化潜力F_v/F_o值全天都保持在4.0以上,且初始荧光上升到最大荧光一半所需时间T1/2在8:00、14:00变化幅度较小;黄果山楂、葡萄、新疆梨和枣也具备一定的耐高光强的能力,最大光能转化效率F_v/F_m值在14:00下降到0.8以下,到20:00又恢复到0.82以上,接近8:00时的值,最大光能转化潜力F_v/F_o值在14:00下降到4.0以下,到14:00值恢复到4.8以上,接近8:00时的值,在开发区具备种植潜力;宁夏枸杞和毛樱桃耐光抑制能力弱,这2个树种的最大光能转化效率F_v/F_m值在14:00和20:00几乎都低于0.8,最大光能转化潜力F_v/F_o值在14:00和20:00都低于4.16,且初始荧光上升到最大荧光一半所需时间T1/2在8:00、14:00时变化幅度大,不适宜在开发区种植。

Comparison on chlorophyll fluorescence characters of thirteen economic tree species in Karamay Agricultural Development Region

The paper measured and compared chlorophyll fluorescence parameters of 13 economic tree species in Karamay Agricultural Development Region to filter economic tree species with anti-light suppression and development prospects from the perspective of photosynthesis mechanism.The results showed that:by comprehensively comparing the values of chlorophyll fluorescence parameters of each tree species,the first choice for economic tree species were Prunus salicina Lindl.,Amygdalus persica L.var.compressa (Loud.) Yü et Lu and Hippophae rhamnoides L.subsp.sinensis Rousi,which had strong anti-light suppression.The maximal loght energy conversion efficiency of Fv/Fm and the maximal light energy conversion potential of Fv/Fo of these three tree species was maintained at more than 0.8 and 4.0 throughout the day,and the time (T1/2) of initial fluorescence rising to half of the maximal fluorescence changed little at 8:00 and 14:00;Crataegus chlorocarpa L.Lenne et C.Koch,Vitis vinifera L.and Pyrus sinkiangensis Yü also had a certain resistance to high light intensity,maximal light energy conversion efficiency Fv/Fm of which decreased to below 0.8 at 14:00 but could be restored to more than 0.82 at 20:00,which was close to the 8:00 value.The maximal conversion potential of Fv/Fo decreased to below 4.0 at 14:00 but could be restored to more than 4.8 at 14:00,which was close to the 8:00 value.Therefore,the three tree species had the potential to grow in the development zone.The ability of antilight suppression of Lycium barbarum L.and Cerasus tomentosa (Tunb.)Wall.was weak.The maximal light energy conversion efficiency Fv/Fm and the maximal conversion potential of Fv/Fo of the two tree species were less than 0.8 and 4.16 respectively both at 14:00 and 20:00.Besides,the time (T1/2) of initial fluorescence rising to half of maximal fluorescence changed a lot at 8:00 and 14:00,so these two tree species were not suitable for planting in the development zone.