在对宁夏中部旱区压砂地土壤养分调查的基础上，选择西瓜地、枸杞地、沙枣地和撂荒地作为研究对象，以有机质、全氮、全磷、全钾、碱解氮、速效磷、速效钾作为评价指标，运用灰色关联分析模型对该区域土壤质量进行综合评价。结果表明，该区域西瓜地土壤质量最优，枸杞地和撂荒地次之，沙枣地土壤质量较差。

Based on the investigation and analysis of soil nutrients on the gravel-sand mulched field in arid area of central Ningxia， watermelon land， wolfberry land， sand jujube land and abandoned land were chosen as research objects， organic matter， alkali-hydrolyzed nitrogen， available phosphorus and available potassium were used as evaluation indexes， the grey relational analysis model was used to evaluate the soil fertility in this area. The results showed that soil fertility of watermelon field was the best in this area， followed by wolfberry field and abandoned land， and the soil quality of oleaster field was poor.

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