辽西北沙地几种农林复合模式的土壤改良效果研究

以辽西北沙地的大扁杏-花生-玉米、大扁杏-麻黄草、樟子松-花生及荒地（对照地）土壤为对象，通过对土壤容重、孔隙度、有机质、N、P、K等指标的分析，研究不同农林复合模式对辽西北沙地土壤的改良效果。结果表明：不同农林复合模式相对于对照原始荒地可降低土壤容重、增加土壤持水量、提升土壤孔隙度等土壤水分物理性质，同时能够增大土壤有机质、N、P、K含量等土壤养分。这对于位于辽西北沙地如何利用有限的降水增加土壤持水能力、改善土壤肥力等关键问题的解决具有重要意义。

Study on Soil Amelioration Effect in Several Agroforestry Modes of Sandy Land in Northwest of Liaoning Province

With soil of Prunus armeniaca-peanut-corn, Prunus armeniaca-Ephedra Grass, scotch pine-peanut and wasteland（control） of sandy land in northwest of Liaoning lh＇ovinee as the object, through determination and analysis of soil bulk density, porosity, organic matter, the content of N, P, K and other indicators, the improvement effect of different agroforestry modes on sandy soil in northwest of Liaoning Province was studied. The results showed that compare to wasteland, other land uses can reduce soil bulk density, increase soil water-holding capacity and soil porosity, and other physical properties of soil moisture, it also can increase soil organic matter, the content of N, P, K and other soil nutrients. The application of agroforestry modes has significance on solving problems that how to use limited rainfall to increase the soil water- holding capacity and improve soil fertility in sandy land of northwest Liaoning Province.