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母生(Homalium hainanense Gagnep)为热带珍贵和比较速生的用材树种。本试验是在类型初步划分的基础上,对其旱季新梢生长量、旱性形态结构与胸高直径和树高生长进行测定,以期探索热带阔叶用材树种的抗旱性选种方法,并为类型划分提供进一步的依据。试验方法参与比较的各个类型的样株,其林龄、林分(在同一测组内)相同、环境条件基本一致。第一测组为本所苗圃后山7年生母生人工林,植被主要为刺灌丛和白茅。土壤为褐色山地砖红壤性土,含砂砾较多、沙壤,保水性很差,每年旱季白茅和飞机草多出现萎蔫现象。
Mother (Homalium hainanense Gagnep) is a tropical species and relatively fast timber species. Based on the preliminary classification of the species, this experiment measured the growth of shoots, the morphological structure of drought and the diameter and height growth of chest height in the dry season, in order to explore the drought-resistant selection method of tropical broad-leaved timber species, Division provide further basis. Test methods involved in the comparison of various types of samples, their age, stand (in the same test group) the same, the same environmental conditions. The first test group for the nursery back 7-year-old mother plantation forests, the vegetation is mainly thorn bushes and Imperata cylindrica. The soil is brown mountain red brick soil, sandy gravel, sandy soil, poor water retention, drought and more each year, white grass and aircraft grass appear wilting phenomenon.