造林的主要目的在于提高植被覆盖度,为人类的生存和农牧业生产创造一个良好的生态环境.要达到这一目的,选择适宜造林树种,则是关键性因素.多少年来,人们在造林问题上只注重乔木,而忽视灌木,甚至把灌木排除之外,造成不适于栽乔木的地方也栽乔木,其结果事倍功半,造的多活的少,保存下来的更少. The main purpose of afforestation is to improve vegetation coverage and create a good ecological environment for the survival of human beings and for the production of agriculture and animal husbandry.To achieve this goal, choosing suitable afforestation species is the key factor.For many years, Focusing only on trees, while ignoring shrubs, and even excluding the shrubs, trees that are not suitable for planting trees are also planted with trees. The result is more effective and less productive, less preserved and less preserved.