作　　者： ; ;

机构地区： 中国林业科学研究院热带林业研究所

出　　处： 《林业科学研究》 1997年第2期137-142,共6页

摘　　要： 采用培养皿－培养箱法和花盆育苗法研究了不同盐度与温度梯度对无瓣海桑种子发芽的影响。结果表明：不同盐度和温度梯度对种子发芽影响差异极显著。有利于种子发芽的温度为２５～３５℃，盐度为１０ｇ／Ｌ以下。当盐度为２．５～５．０ｇ／Ｌ时，发芽率及胚根长度与淡水对照相一致，但生长粗壮，发芽条件最好；盐度为１０．０～１５．０ｇ／Ｌ时，种子发芽率（出苗率）和胚根长度（幼苗高度）显著降低；盐度１５ｇ／Ｌ以上时，种子虽能部分发芽，但胚根生长慢，后期坏死，在大田育苗时表现为不能出土萌发。以淡水浇苗床可以降低盐度，促进种子萌发。在低盐度条件下，胚根对Ｎａ＋、Ｃｌ－的吸收随时间逐渐增加而后趋向动态平衡状态。 Effect of different gradients of seawater salinity (0～35 g/L) and temperature (20～35℃) on seed germination of mangrove tree species, Sonneratia apetala Buch. Ham. was reported in the paper and the results showed that the discrepancy among them was remarkable. Generally benefitial conditions for seed germination were temperature higher than 25℃,salinity below 10.0 g/L. The best condition for seed germination was salinity gradient from 2.5 g/L to 5.0 g/L and temperature 30～35℃. When salinity was among 10～15 g/L,seed germination and young seedlings growth apparently declined;when salinity was higher than 15 g/L,only a few seeds could germinate and young seedlings grew far slowly and afterwards gradually died with salinity damage in culture dish but no seeds could germinate in mudflat field nursery. Spraying freshwater on mudflat field nursery could improve seed germinating percentage to a great degree. Under low seawater salinity such as 2.5～7.5 g/L,the content of Na + and Cl - assimilated by young seedlings gradually increased with time and then reached dynamic balance in 20 days.

关 键 词： 红树植物 无瓣海桑 盐度 温度 种子发芽

领　　域： [农业科学] [农业科学]