What type vegetation should be chosen in the process ofvegetation con struction in arid and semi-arid regions is an inevitable and often disputable t opic.

• 在干旱半干旱区植被生态建设过程中，需要进行决策并经常引起争论的问题是，应该选择哪种类型植被，才能获得最大的防风效应。