营造防护林有两个主要目的。一是近期的,用以改善小区气候,逐年增加农业产量。据调查,在丹麦多风地区增产量达到4—10％。另一个目的是为了子孙后代,保护土壤不被侵蚀。我将就此讲如下几个问题: 1.风的运动和防护林。 Shelter forests have two main purposes. First, the recent, to improve the climate of the district, increasing agricultural output year by year. According to the survey, the increase in windy areas in Denmark reached 4-10%. Another purpose is for future generations to protect the soil from erosion. I will now talk about the following questions: 1. Wind movement and shelterbelts.