盐度对滨海修复种海马齿生长及荧光参数的影响

Effect of Salinity on Growth and Fluorescence Parameters of Coastal Restoration Species Sesuvium portulacastrum

摘要:

为探究海马齿（Sesuvium portulacastrum）生长的适宜盐度和适宜区域，利用恒温培养箱，模拟人工生态浮床进行水培，对其在不同盐度培养液中的生长情况和荧光参数进行测定。结果表明，海马齿在0~15‰盐度下生长状况良好，且10‰盐度的海水对其生长具有促进作用，相对生长率和荧光参数在盐度5‰和20‰以上均会受到抑制；盐胁迫会导致海马齿的光能利用率下降，调节性能量耗散上升，电子传递效率下降，从而影响植物光合作用；当盐度达到30‰造成植物死亡。在温度适宜条件下，海马齿具有良好的生态修复潜力和海水蔬菜开发前景，0~15‰盐度水域可以成为其修复工程的应用区域，10‰盐度能够促进海马齿生长，有利于海水蔬菜的培育。

Abstract:

To explore the appropriate salinity and appropriate region of Sesuvium portulacastrum growth, the growth and chlorophyll fluorescence parameters were measured simulated artificial ecological floating bed for hydroponics in constant temperature incubator. The results showed that the growth of S. portulacastrum was well at 0-15‰ salinity conditions, and seawater with 10‰ salinity promoted its growth. The relative growth rate and fluorescence parameters were inhibited when the salinity was 5‰ and above 20‰. The light energy utilization and electron transfer efficiency of S. portulacastrum decreased under salt stress, and regulatory energy dissipation increased, thus affecting photosynthesis. When salinity reached 30‰, S. portulacastrum death finally. Therefore, S. portulacastrum had a good potential for ecological restoration and marine vegetables development at the appropriate temperature, the salinity of 0-15‰ water area could be the restoration application area, while 10‰ salinity could promote its growth and cultivation of marine vegetables.