盐渍化对稻麦轮作模式下黄河三角洲盐碱地小麦土壤理化性质和酶活性的影响

[Objective]The purpose of this study was to investigate the effects of salinization under rice-wheat rotation on soil physicochemical properties and enzyme activities of wheat in the Yellow River Delta. [Method]By rotating whe at under low, medium and high salinity conditions, soil samples were collected during the wheat growing season, soil con ductivity, moisture content and nutrient content were determined, and the activities of soil enzymes such as sucrase, cellula se and amylase were analyzed, so as to analyze the influence mechanism of soil physicochemical properties on soil enzym e activity. [Result]The results showed that the content of available phosphorus had a significant effect on amylase activi ty at jointing stage, and the content of total nitrogen and organic matter had a significant effect on the activities of cellul ase and sucrase at different stages. Total nitrogen content had a significant effect on sucrase activity, available potassium c ontent had a significant effect on cellulase activity, and organic matter content had a significant effect on amylase activity at flowering stage. At the grain filling stage, total nitrogen content had a significant effect on the activities of the three e nzymes, available phosphorus content had a significant effect on amylase activity, and organic matter content had a signifi cant effect on cellulase activity.[Conclusion] From the whole growth cycle of wheat, the content of available phosphorus had a significant effect on the activities of sucrase and amylase, and the content of available potassium had a significant effect on the activity of cellulase. In general, salt content and water content had significant effects on the activities of the three enzymes, and different enzymes had different adaptations to salinity and water.