论文部分内容阅读
自然条件下,对5种胡枝子属植物光合作用日进程和光响应进行了观测,结果表明5种胡枝子净光合速率的日变化在夏季表现为双峰曲线,有光合“午休”现象。牛枝子、达乌里胡枝子、阴山胡枝子、截叶胡枝子和尖叶胡枝子日平均光合速率分别为3.75μmol CO2.m-2.s-1、3.55μmol CO2.m-2.s-1、3.37μmolCO2.m-2.s-1、4.45μmol CO2.m-2.s-1、3.78μmol CO2.m-2.s-1;光补偿点分别为38.23μmol.m-2.s-1、43.24μmol.m-2.s-1、13.75μmol.m-2.s-1、36.11μmol.m-2.s-1和45.46μmol.m-2.s-1;光饱和点分别为:1225μmol.m-2.s-1、1262.6μmol.m-2.s-1、1287.5μmol.m-2.s-1、1462.5μmol.m-2.s-1和1312.5μmol.m-2.s-1显示了阳生植物特性。表观量子效率分别为0.034、0.037、0.32、0.036和0.033,可看出5种胡枝子叶片光能转化效率低,其对光的响应敏感性较差。因此,这5种胡枝子对光环境适应能力强,适合在较大范围栽植。
Under natural conditions, the daily photosynthesis and photoresponse of five species of Lespedeza were observed. The results showed that the diurnal changes of net photosynthetic rate of five Lespedeza species showed a bimodal curve in summer with photosynthesis “lunch break ” phenomenon. The daily average photosynthetic rate of Lespedeza davidiana, Lespedeza davurica, Lespedeza yarnsworn, Lespedeza notoginseng and Lespedeza notoginseng were 3.75μmol CO 2 · m-2.s-1,3.55μmol CO 2 · m-2.s- 1, 3.37μmol CO2.m-2.s-1, 4.45μmol CO 2 · m-2.s-1, 3.78μmol CO 2 · m-2.s-1; light compensation points were 38.23μmol.m-2.s -1.43.24μmol.m-2.s-1, 13.75μmol.m-2.s-1,36.11μmol.m-2.s-1 and 45.46μmol.m-2.s-1; light saturation point Respectively, 1225μmol.m-2.s-1, 1262.6μmol.m-2.s-1,1287.5μmol.m-2.s-1,1462.5μmol.m-2.s-1 and 1312.5μmol.m -2.s-1 shows the characteristics of sun plants. Apparent quantum efficiency of 0.034,0.037,0.32,0.036 and 0.033, respectively, we can see five kinds of Lespedeza leaf light energy conversion efficiency is low, its sensitivity to light is poor. Therefore, these 5 species of Lespedeza adapt to the light environment, suitable for planting in a larger area.