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在东海岛沙质海岸防护林营造中,选用木麻黄8 个优良无性系和1 个本地实生苗进行造林对比试验。结果表明:造林后第3 年起8 个无性系的树高生长均快于实生苗,其中无性系“503”树高生长一直保持最快;随着时间的推移,无性系间树高生长差异有逐步缩小的趋势;到第5 年“503”树高生长与其他7 个无性系已无显著差异,只显著快于实生苗。4 年生前木麻黄各无性系间的胸径生长无显著差异,从第5 年起无性系“南三7”与实生苗的生长差异显著,此后,8 个无性系全部超过实生苗。
In the construction of the shelterbelt on the coast of the sandy island of the East China Sea, eight excellent clones of Casuarina equisetifolia and one local seedling were selected for afforestation comparative experiment. The results showed that the tree height of eight clones was faster than that of the seedlings in the third year after afforestation, of which the growth of tree height of clones “503” kept the fastest. With the passage of time, the difference of tree height between clones There is a trend of gradually shrinking. By the fifth year, there is no significant difference between the tree height growth of “503” and the other seven clones, only significantly faster than the seedlings. There was no significant difference in DBH growth between clones of 4-year-old Casuarina equisetifolia. From the 5th year onwards, there was a significant difference in the growth of clones between “Nansan 7” and seedlings. All the 8 clones exceeded the number of seedlings.