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该文重点研究了新造防护林前5年的防护效益。结果林冠截留系数可达19％，地表径流系数比荒地减小10％至19％，土壤蓄水能力比荒地提高90％。造林第3年产沙量减少至造林前的03至0．9，第5年时仅为造林前的0．1至0．3。同时防护林效益将随林龄增加而增长。
The article focuses on the protective benefits of the new shelterbelt five years before. Results The interception factor of the canopy was up to 19%, the surface runoff coefficient was reduced by 10% to 19% and the soil water storage capacity was increased by 90% compared with the wasteland. In the third year of afforestation, the sediment yield decreased from 03 to 0.9 before afforestation and from 0.1 to 0.3 before afforestation in the fifth year. At the same time, the benefit of shelterbelt will increase with the increase of forest age.