对开蕨对遮荫处理的响应

研究了全光和遮光30%、50%、70%、90%处理对对开蕨生长及光合生理特性的影响。结果表明:随着遮光强度的增大,对开蕨叶片面积、单位叶面积鲜质量、叶绿素含量、叶片含水量增加,可溶性糖含量、可溶性蛋白含量下降;净光合速率日变化呈双峰曲线,有光合"午休"现象;日平均净光合速率以遮光50%～70%处理为最佳;光补偿点逐渐降低;光饱和点在遮光50%处理下最高,遮光70%和90%处理下较低。综合考虑,对开蕨适宜的光环境为遮光50%～70%。

Responses of Phyllitis japonica to Shading Treatment

The effects of all optical，30%，50%，70% and 90% shading treatments on the growth and photosynthetic characteristics of Phyllitis japonica were studied. The results showed：With the increase of light intensity，the leaf area，fresh weight of unit leaf area，chlorophyll content，and leaf water content decreased and soluble sugar and soluble protein content declined. The diurnal variation of net photosynthetic rate（Pn）presented the double-peak curve，indicating there was midday depression of photosynthesis; the optimum treatment to diurnal average Pn was 50%–70% shading. The light compensation point（LCP）reduced gradually and the light saturation point（LSP）was the highest under 50% shading，which was lower in 70% and 90% shading. Comprehensively，the suitable light environment of Phyllitis japonica was 50%–70% shading.