热带、亚热带常绿阔叶林，特别是热带雨林，是价值难以估量的生物宝库。但由于其树木种类繁多，优势树种不明显，不便于工业采伐利用，所以，过去连林业部门对它也不很重视，通常称之为“杂木林”而将其砍掉，用于“建设杉木林基地”。其实，热带、亚热带森林的许多树种，往往? Tropical, subtropical evergreen broad-leaved forests, especially the tropical rain forest, is an invaluable treasure trove of value. However, due to its wide variety of trees, the dominant tree species are not obvious and are not convenient for industrial logging. Therefore, even the forestry sector did not attach much importance to it in the past. It is often called “mixed forest” and cut off for “building fir Forest base. ” In fact, many species of tropical and subtropical forests are often?