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防护林带和林网在干旱、半干旱地区对农田起着重要的保护作用。多年来,人们一直在研究具有最佳防护效果的林带和林网,但多数研究都很难在生产上应用推广。为此,周士威等人从1980年开始着手研究解决这一问题,最后提出了一个新的定量指标——隙高比(即行内株间的平均树冠间隙与林带平均高的比值),这一指标的提出,不仅解决了防护林营造和管
Shelter belts and shelterbelt play an important role in protecting farmland in arid and semi-arid areas. For many years, people have been studying the belt and forest net with the best protection effect, but most of the research is hard to apply in the production promotion. To this end, Zhou Weili and others started to study and solve this problem from 1980, and finally proposed a new quantitative index - the gap height ratio (that is, the average row canopy between the canopy gap and the average high ratio), this indicator The proposal not only solved the construction and management of shelterbelts