中文摘要：

通过室内模拟试验研究了不同潮汐淹浸时间对红树植物秋茄Kandelia candel幼苗生长的影响，测定了秋茄幼苗各项生理指标、生长量和生物量．150d的试验结果表明：秋茄幼苗的叶绿素含量、过氧化物酶活性和根活力随淹浸时间的延长先升后降，而超氧化物歧化酶活性、游离脯氨酸含量、丙二醛含量和相对电导率随淹浸时间的延长先降后升，并在每天水淹16h时出现骤变分界点；水淹逆境对幼苗叶片影响最大，月均叶片数增长最大值（每天水淹2h）比月均叶片数增长最小值（每天水淹24h）增大了80％；总生物量、茎和根干质量均为每天水淹12h处理最大，当每天水淹超过16h后，秋茄幼苗总生物量骤降．结合适应度分析得出结论：秋茄幼苗最适淹水时间为每天8～12h，临界淹水时间为每天16h．

英文摘要：

A greenhouse experiment on the effect of different simulated tidal inundation times on the growth of mangrove Kandelia candel seedlings was conducted, and some physiological and growth indexes of the seedlings, including growth rate, biomass and malondialdehyde, peroxidase, electrical conductivity chlorophyll content, superoxide dismutase, proline, and root activity were measured. The 150-d experi- mental results showed that the chlorophyll content, peroxidase and root activity would rise first and then fall while superoxide dismutase, proline, malondialdehyde, and electrical conductivity would fall first and then rise as the extension of the inundation, and a sharp change of these indexes happened at 16 h · d^-1 of inundation time. The leaves were affected most severely under the flooding adverse circumstance, and the averaged leaf number of the seedlings under 2 h·d^ -1 of inundation （ the maximum value） was 0.8 times more than that under the 24 h ·d^-1 of inundation （the minimum value）. The maximum value of the total biomass, dry biomass of stem and dry biomass of roots appeared under the 12 h ·d^ -1 of inundation, and a sharp change in total biomass happened when the inundation exceeded 16 h ·d^-1. The re- suits demonstrated that 8 - 12 h·d^ -1 of tidal inundation was most suitable for the growth of Kandelia candel seedlings, while 16 h·d^-1 was a critical tidal inundation time when the plant responded to be obviously inadaptable.