中文摘要：

研究了荒漠开垦为绿洲后土壤的演变规律。以黑河流域河西走廊中段临泽绿洲为例,结合野外调查及室内化学分析方法,研究不同土地利用方式下土壤的物理、化学性状。结果表明：戈壁开垦后,表层（0～20 cm）和亚表层（20～40 cm）土壤有机碳和全N含量均表现为林地最高,草地和林草间作地居中,农田最低。绿洲农田表层土壤速效P含量相对戈壁而言提高了48%,明显高于其它几种利用方式。荒漠绿洲区K素的含量一直处于一个很高的水平,开垦利用对其影响不大。开垦耕种后土壤砂粒含量明显降低,细粒物质明显增加。合理的耕作和管理措施使土壤含盐量显著减小。合理营造防护林能够促进绿洲化的进程。

英文摘要：

Research works have been done to assess the characteristic of soil quality under different land use type in the desert oasis region.This research taking the Linze oasis in Heihe River valley as an example,through combined field survey with laboratory experiments,the soil nutrient distribution properties under different land use type were investigated and analyzed.It revealed that the contents of soil organic matter（SOM） and total N show the high values for woodland,lowest values for farmland,and middle values for grass and grass-forest-mixed land.The content of available P increases 48% compared to Gobi and obviously higher than other use type.The content of K in this oasis shows persistent highly value and cultivation has little effect on it.After cultivation,sand content decreased,silt and clay content increased.Appropriate land use and management obviously decreased total salt content.