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根据榆林市金鸡滩乡海流滩村的自然条件和社会经济条件，以林木覆盖度极大为目标，对该区域生态经济型防护林结构优化研究表明。按优化模式实施后，到２０００年，林木覆被率达５２．４％，农、林和牧（草场）土地利用面积之比为１：５．４：０．５。
According to the natural conditions and socio-economic conditions of Hailutan Village, Jinjitan Beach, Yulin City, the study aimed to optimize the structure of eco-economic shelterbelts based on the maximum coverage of trees. According to the optimized mode, the forest cover rate will reach 52.4% by the year 2000, and the land use area ratio of agriculture, forestry and pasture (grassland) is 1: 5.4: 0.5.