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以宁夏海原县关桥乡罗山村的绵砂压砂地为对象,邻近未压砂地农田为对照,研究压砂1a,3a,5a,7a,10a后土壤机械组成,理化性质及酶活性的变化。结果表明:压砂地与对照相比土壤水分含量高、全盐含量低;随着压砂年限的增加土壤质地粗化、容重明显增加,毛管孔隙度、持水量降低;土壤有机质、全氮、全磷、全钾、硝态氮、速效磷、速效钾均呈下降趋势,过氧化氢酶、脲酶、中性磷酸酶、蔗糖酶的活性也逐年降低。连作3a表现出明显的连作障碍,压砂10a土壤质量状况较差。说明压砂对土壤的影响是双向的。
The changes of soil mechanical composition, physicochemical properties and enzyme activities were studied after 1, 3a, 5a, 7a and 10a years of sand compaction for the sand mulched sandy land in Luo Shan Village, Guanqiao Township, Haiyuan County, Ningxia. The results showed that the content of soil salinity was low and the content of total salt was low compared with the control. With the increase of sand age, the soil texture became coarse, the bulk density increased obviously, and the capillary porosity and water holding capacity decreased. The contents of soil organic matter, total nitrogen and total Phosphorus, total potassium, nitrate nitrogen, available phosphorus, and available potassium all showed a decreasing trend. The activities of catalase, urease, neutral phosphatase and invertase also decreased year by year. Continuous cropping 3a showed obvious continuous cropping obstacle, and the soil quality of sandstone sand was poor. The effect of sand on the soil is bi-directional.