植被演替是地植物学中的一个基本和重要的理论问题。植被科学的发展,常常与植被演替理论的发展有着密切的联系。同时,植被演替问题和农林牧生产实践关系紧密,如关于森林采伐和抚育更新、次生林改造利用、荒山造林及混交林树种间关系、草原利用和改良、如何防止草原退化、人工草地培植及草种关系与搭配等等问题的解决,都牵涉到植被演替问题,尤其是西北黄土高原植被恢复和建造这一生产中的突出问 Vegetation succession is a basic and important theoretical issue in botany. The development of vegetation science is often closely related to the development of vegetation succession theory. At the same time, the problem of vegetation succession is closely related to the practice of farming, forestry, animal husbandry and production. For example, the paper discusses the relationship between the cutting and raising of forests, the transformation and utilization of secondary forests, the afforestation and afforestation, the utilization and improvement of grasslands, how to prevent grassland degradation, The relationship between species and collocation and so on are all involved in the problem of vegetation succession, especially in the production of the vegetation restoration and construction in Northwest Loess Plateau