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在海南岛东林场和文昌林科所两个试验点通过观测树高、胸径、保存率、干形和抗风性,开展了24个木麻黄无性系的选择研究。结果表明:两个试验点24个无性系在树高和胸径生长都有极显著差异,5年生的平均树高、胸径和单株材积分别为13.2 m、10.6 cm和0.048 m3,最优无性系平均树高和胸径分别达到15.2 m和13.0 cm,平均材积为106.67 m3/hm2,年均材积生长量为21.33m3/hm2,最优无性系年均材积生长量29.89 m3/hm2;通过6个性状的综合评价,在岛东试验点选出适合该地区的6个无性系分别为A1、F41、NS-8、A13、F40和ZaJiao;在文昌试验点选出适合低洼地的6个无性系分别为F71、701、A13、A8、F20、ZJ-001;根据无性系的树高和胸径生长曲线,发现造林后第2年无性系的生长速度最快,5年生木麻黄的无性系仍处于高速生长期。
A total of 24 Casuarina equisetifolia clones were selected for selection at two test sites, Donglinchang and Wenchanglinke of Hainan Island by observing the tree height, DBH, storage rate, dryness and wind resistance. The results showed that there were extremely significant differences in tree height and DBH growth among 24 clones at the two experimental sites. The mean tree height, DBH and single plant volume of 5-year-old were 13.2 m, 10.6 cm and 0.048 m3, respectively. The average tree height and the diameter at breast height reached 15.2 m and 13.0 cm, respectively, with an average volume of 106.67 m3 / hm2 and an annual average volume growth of 21.33 m3 / hm2. The average annual volume growth of the best clones was 29.89 m3 / hm2. The six clones suitable for this area were selected as A1, F41, NS-8, A13, F40 and ZaJiao respectively in the east island test site. Six clones suitable for the low-lying area According to the tree height and DBH growth curves of clones, the clonal growth rate of the second year after afforestation was the fastest, and the clonal of 5-year-old Casuarina equisetifolia was still at high speed Growth period.