海南油茶一年生实生苗生长规律研究

Study on growth of one year seedlings of Camellia oleifera in Hainan

以海南琼海阳江油茶种子培育出的1年生实生苗作为试验材料,研究了根长、根量、苗高、地径、生物量等指标的年变化规律。结果表明,各项指标变化均呈典型的logistic生长曲线,整个生长过程可划分为生长初期,生长盛期和生长末期。其中,根长在翌年7~9月增长最快,1年生苗平均根长18.7cm;7~9月,种苗侧根数量明显增加,1年生苗总根量平均为38.8根/株。苗高在翌年7~9月增长迅速,平均增长6.2cm/月;地径从翌年4月开始增长,9~11月份增长最快,1年生苗地径平均为4.8mm。生物量从12月播种至翌年6月积累缓慢,翌年7~10月积累加速,1年生苗平均生物量18.4g(鲜重)、7.7g(干重)。

The root length, root amount, height, diameter at root, biomass of Camellia oleifera seedlings were measured monthly in one year. The results showed that all indexes changed like a logistic growth curve and the whole process of growth can be divided into three stages which are initial, middle and final stage respectively. The root length, amount and height of seedlings increased fastest in period of July to September of next year when the indexes above were 18.7cm, 38.8 roots and 6.2cm respectively for one year old seedlings. The incre- ments of diameter at root initiated in April and grow fast in period of September to November and the average was 4.8mm.for one year old seedlings. The biomass increased quickly from next July to October and the aver- age biomass was 18.4g（FW）, 7.7g（DW）.