红海榄人工幼苗生长特征研究

Growth characters of artificial Rhizophora stylosa seedlings

幼苗期是红海榄种群占据新环境的关键阶段。在北海潮滩对红海榄的人工高密度海上育苗试验显示,1年生红海榄苗生长节律是平均高生长速度为3.7cm.月1,速生期7—10月平均温度27.1℃,生长速度6.75cm.月1;慢生期为12月至次年3月,平均温度16.3℃,平均生长速度0.9cm.月1;中速生长期4—6月和11月平均气温24.7℃,生长速度3.76cm.月1。3年生苗的生长规律表现为第1年高生长增加最快,第2年全株生物量比第一年增加1.4倍,第3年的生长速度较前两年有所减缓,生物量比第2年增加24%。

Seedling period is the key phase for Rhizophora stylosa population inhabit.An artificial nursing experiment of R.stylosa was conducted on Beihai beach.The results show that average height growth in the first year is 3.7 cm.month 1.One-year seedling is divided into three phases by growth rates.July to October is the fast growth phase when the average temperature is 27.1℃ and growth rate is 6.75 cm.month^- 1.In the slow growth phase of December to March,the growth rate is 0.9 cm/month and mean temperature is 16.3℃.During the medium growth phases of April to June and November,the growth rate is 3.76 cm.month 1 while the mean temperature is 24.7℃.The growth characters of 3-year seedlings are that the seedling height growth is the fastest in the first year,and 2-year seedling biomass is 1.4 times more than the 1-year’s,the 3-year seedling biomass increase slows down and has increased only 24% compared to the 2-year’s.