【摘要】 红砂和珍珠的生理生态特性随其生长的环境条件而变化;长期生长在一起的红砂和珍珠其生理生态特性具明显的差异,两者适应逆境的机制亦不相同。红砂和珍珠作为超旱生植物,其生理生态学特性明显区别于其他沙生植物;生长在山前地带的红砂和珍珠,可以在极低的水势条件下保证其生命活动,低的水势可能与渗透调节物质(如大量的脯氨酸)的存在有关,这类物质增加了植物的吸水能力;红砂和珍珠的光抑制程度较其他沙生植物要高得多,且光抑制的产生已对两种灌木光合色素产生了破坏,然而在条件稍好的早晚光抑制可得到恢复。更多还原

【Abstract】 Reaumuria soongorica and Salsola passerine have significant differences in ecophysiological characteristics,and they change with environmental variation although they live together for a long term.Their adaptive mechanisms to environmental stresses are very different.As two extreme xerophytes,Reaumuria soongorica and Salsola passerina differ significantly from other psammophytes in ecophysiological characteristics;they can survive in lower water potential,even grow in the piedmont area.Low water potential may be related to the existence of osmosis-regulating substance,such as proline,which can strengthen their water absorption capacity.Compared to other psammophytes,Reaumuria soongorica and Salsola passerina have higher degree of photo-inhibition under same condition,and photo-inhibition can lead to destruction of the photosynthetic pigment,nevertheless,the photo-inhibition can be repaired under suitable conditions in the morning and evening.更多还原