论文部分内容阅读
以甘草和柠条播种苗为材料,设置不同的密度处理,测定两者生长旺盛期的光合特性指标。结果表明:甘草和柠条播种苗的光响应曲线有差异;甘草和柠条的最大光合速率分别为21μmol CO2·m-2·s-1和7.9μmol CO2·m-2·s-1,光饱和点分别为1 504.2μmol·m-2·s-1和1 187.5μmol·m-2·s-1。甘草的初始荧光(Fo)小于柠条,Fv/Fo、Fm/Fo和Fv/Fm均略高于柠条。随着密度增大,甘草和柠条的各生长指标显著下降。密度竞争对甘草和柠条播种苗的光合和蒸腾速率有一定的影响,高密度处理下(80株/盆)两者的水分利用效率明显提高。说明甘草对强光利用率强,柠条对弱光有较好的利用率,两者光能利用策略不同,通过调控有望实现合理套种。
The seedlings planted with licorice root and Caragana korshinskii were used as materials, and different density treatments were set up to measure the photosynthetic characteristics of both. The results showed that the light response curves of licorice and Caragana microphylla were different. The maximum photosynthetic rate of Glycyrrhiza uralensis and Caragana korshinskii were 21 μmolCO 2 · m -2 · s -1 and 7.9 μmolCO 2 m -2 · s -1 The saturation points were 1 504.2 μmol · m-2 · s-1 and 1 187.5 μmol · m-2 · s-1, respectively. The initial fluorescence (Fo) of licorice root was lower than that of Caragana korshinskii, Fv / Fo, Fm / Fo and Fv / Fm were slightly higher than that of Caragana korshinskii. With the increase of density, the growth indexes of licorice and kadai decreased significantly. The density competition had some effects on the photosynthesis and transpiration rate of the seedlings of licorice root and the seedlings of Caragana korshinskii. The water use efficiency of the two plants increased significantly under the high density treatment (80 plants / pot). It shows that licorice has better utilization rate of glare and better utilization rate of kadsura for weak light. The strategies of light utilization are different, and it is expected to achieve reasonable interplanting by controlling.