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在全光照条件下用恒定淹水位淡水培养处理红树植物桐花树(Aegiceras corniculatum)幼苗1 a,以人工海水(0.8%盐水)处理为对照,研究了淡水驯化对桐花树幼苗叶片生长和叶绿素含量及硝酸还原酶活性的影响。结果表明:两种处理下桐花树幼苗叶片的生长变化基本一致,随着生长时间的延长,叶片数持续增加,经方差分析,两种处理的幼苗叶片数没有显著的差异;在2008年10月与11月期间,淡水组幼苗叶片的最大叶面积显著大于人工海水组,但两种处理在其他月份并无显著差异,且两种处理的幼苗叶片长宽比没有显著差异;在360 d,淡水组幼苗叶片的鲜重和干重分别低于人工海水组的16.79%和19.01%,但两者没有达到显著差异;两种处理幼苗叶片的总叶绿素含量和硝酸还原酶活性的变化趋势基本一致,两种处理没有显著的差异。以上结果表明:淡水驯化对桐花树幼苗叶片的生长发育没有不利的影响,桐花树幼苗可以正常生长发育,表明桐花树对淡水环境具有较强的适应性。
Aegiceras corniculatum seedlings were treated with fresh water at a constant flooding level for 1 a under full light condition. Artificial seawater (0.8% saline) was used as a control to study the effect of freshwater acclimation on the growth of Aegiceras corniculatum Chlorophyll content and nitrate reductase activity. The results showed that the growth of leaves of Aegiceras corniculatum seedlings was basically the same under the two treatments, and the number of leaves continued to increase with the growing time. There was no significant difference in the number of leaves between the two treatments in variance analysis. The maximum leaf area of freshwater seedlings was significantly higher than that of artificial seawater during the month and November, but there was no significant difference between the two treatments in other months. There was no significant difference in leaf aspect ratio between the two treatments at 360 days, The fresh weight and dry weight of freshwater seedling leaves were 16.79% and 19.01% lower than that of artificial seawater respectively, but the difference was not significant. The trend of change of total chlorophyll content and nitrate reductase activity was basically the same There was no significant difference between the two treatments. The above results show that freshwater domestication has no adverse effect on the growth and development of Aegiceras corniculatum seedling leaves, and Aegiceras corniculatum seedlings can grow and develop normally, indicating that Aegiceras corniculatus has strong adaptability to freshwater environment.