一、前 言 果园防护林是防风、防冻、防旱、提高经济效益的一项综合性措施。我省柑桔面积在解放初为3.9万亩,到1984年已发展到80万亩左右,其中海涂沙滩占18％,为了保障柑桔生产的稳产高产,沿海各地在发展柑桔生产时,对建立柑桔园防护林已有一定经验,并已营造了一大片防护林。1984年我们在玉环县解放塘农场对文旦果园木麻黄林网防护效益进行了观测,1985年又在我省的 I. Introduction Orchard shelterbelts are a comprehensive measure to prevent wind, freeze, drought and improve economic efficiency. The area of ​​citrus in our province was 39,000 mu during the liberation, and by 1984 it had grown to about 800,000 mu, including 18% for the beach. In order to ensure stable and high-yielding citrus production, There has been some experience in establishing citrus orchards and has created a large shelter. In 1984 we Yuhuan County Jiefang pond farms on the protection of the benefits of casuarina plantation was observed in 1985 in our province