对内蒙古西部磴口县新开发乌兰布和沙地人工绿洲防护林体系作了评价。试区土地开发建立防护林体系后，森林覆盖率由零增加到２６４％。研究结果表明：１）农田防护林网增产效益显著，林网内小麦、籽瓜、甜菜的单产分别比林网外提高４５７７％、１５５７１％、２５０％。２）农田防护林体系建设６年后，即可盈利，第１０年可收回全部投资，并盈利２２２１７×１０４元。３）年沙尘暴日数、扬沙日、浮尘日、尘卷风日、大风日等灾害性天气指标，林网内较林网外分别减少５６５％、５６８％、３８７％、６３９％、６５％；年平均风速降低３８６％～６３２％。４）经鉴定，开发区有细菌７属１０种、放线菌１属１４种、真菌２属；荒漠区有细菌４属４种、放线菌１属８种、未见真菌。开发区１层（２～１０ｃｍ）、２层（１０～３０ｃｍ）、３层（３０～１００ｃｍ）土壤的含盐量分别下降０３１６％、０１３６％、０１６６％；ｐＨ值下降０８８。５）建立沙漠绿洲后，为野生动物和鸟类资源创造了良好的栖息繁衍环境，至１９９４年增长率为１００％～４００％。６）社会经济年平均增长率（Ｐ）为４６２１９％；开发区人口承载力开发后较开发前增加了３３１倍；开发前人均年收? The artificial oasis shelter forest system of the newly developed Ulan Buh and sandy land in Qkoukou County, western Inner Mongolia was evaluated. After the development of the shelterbelt system in the trial area, the forest coverage rate increased from zero to 26.4%. The results showed that: 1) The yield increase of farmland shelterbelts was significant. The yields of wheat, watermelon and sugar beet in the shelterbelt increased by 4577%, 15571% and 250% respectively than those outside the shelterbelt. 2) After 6 years of construction, the farmland shelter forest system will be profitable. In the 10th year, all investments will be recovered with a profit of 22217 × 104 Yuan. 3) Severe weather indices such as days of sandstorm, sand-blowing, dust days, dust-storm days, and windy days decreased by 565%, 568% and 387% 63  9%, 6  5%; annual average wind speed decreased 38  6% ~ 63  2%. 4) It has been identified that there are 10 species of 7 genera in the development zone, 14 species of 1 genera of actinomycetes, 2 genera of fungi, 4 genera of 4 genera and 4 species of actinomycetes in the desert area, no fungi were found. The salt content in the first layer (2 ~ 10cm), second layer (10 ~ 30cm) and third layer (30 ~ 100cm) in the development zone decreased by 0316%, 0136% and 0166% 088.5) After the establishment of the desert oasis, a good habitat and breeding environment for wildlife and bird resources has been established, with a growth rate of 100% to 400% by 1994. 6) The average annual economic and social growth rate (P) was 462.19%; the carrying capacity of the development zone increased 33.1 times compared with that before the development; the annual per capita income before development