Response of Enzyme Activity of Cultivated Saline Soil to Sand Covering

In order to clarify the response of soil enzyme activities of cultivated salinealkali soil to sand cover in the Loess Plateau-Mu Us Sandy ecotone. In this study, the soil enzyme activities of the saline-alkali soils before and after sand-covering (CK) and after sand-covering for three consecutive years were taken as the research objects. The results showed that the activities of four soil enzymes (urease, catalase, protease, and alkaline phosphatase) all increased to varying degrees after covering with sand. Among them, the effect of covering with sand on soil urease and alkaline phosphatase was significant. In general, the activities of the four soil enzymes are negatively correlated with soil physical properties (except porosity) and positively correlated with soil chemical properties. This study provides data support for revealing the long-term effects of sand-covering on soil enzyme activities of cultivated saline-alkali soils, and provides a reasonable idea and theoretical reference for the feasibility of using sand-covered soil organic restructuring technology in saline-alkali soil management.