中文摘要：

在野外调查与室内分析的基础上，研究18年生与8年生柠条林对土壤养分、土壤结构性能、土壤酶活性的影响。结果表明：灌木林（柠条）可明显提高土壤中有机质、速效氮和速效钾的含量，降低土壤pH和密度；快速显著地增加土体中〉5mm水稳性团聚体和〉0．01mm微团粒的数量，使土壤的营养状况及结构得到很大改善，协调供应养分和水分的能力提高；能促进粘粒形成聚积，防止土地退化和保护生态环境。

英文摘要：

Based on the field investigation and indoor analysis, soil nutrients, soil structure and proporties and soil enzyme activities were.studied with 18-year-old and 8-year-old Caragana korshinskii. The results showed that the shrub（ C. korshinskii） would improve the content of soil organic matter, rapidly available nitrogen, rapidly available potassium, decrease soil pH and soil density. It would also increase the contents of soil water-stable aggregates（ 〉 5 mm） and microaggregates（ 〉 0.01 mm）, improve the soil nutrient conditions and change the soil structure, improve the soil ability to service nutrients and water. It would also accelerate the clay soil to form the accumulation, prevent soil degeradation and protect eeo-environment.