果园防护林是果树生产的卫士,它起着防风沙、调节气候、稳定积雪、减少蒸发、相对提高湿度等作用.在北方有些地区正当果树发芽开花时期,气候多变,风、霜、雪、雨时而发生.夏季在果树迅速增长、枝叶盛长期,也常遭大 Orchard protection forest is the guard of fruit trees, it plays a sandstorm, climate regulation, stabilizing the snow, reducing evaporation, the relative increase in humidity and other functions.In some parts of the North during the legitimate fruit trees germination and flowering, climate change, wind, frost, snow, Rain occurs from time to time during the summer in the rapid growth of fruit trees, branches and leaves of long-term, but also often large