柴达木盆地盐渍化土壤养分和酶活性特征

o explore the characteristics of nutrient and enzyme activity in salt-affected soils of different degreesin the Qaidam Basin, five sampling points along the direction from Chahan Salt Lake to Kunlun Mountains wereselected. The soil nutrient and enzyme activity characteristics and their correlations were analyzed. The resultsshowed that soil salinization degree, soil depth, and their interactions significantly affected soil nutrient contentand enzyme activity (P<0.05), except for soil total potassium. In soils with lower salinity, nutrient availability(except for available potassium) and enzyme activity were higher and decreased with increasing soil depth.Taking organic carbon and invertase as examples, the contents in the S5 sampling site with the lowest salinitydegree were 13.83 gkg1 and 21.01 mgg1d1(0-5 cm), 12.85 gkg1 and 19.29 mgg1d1(5-10 cm), and 9.83gkg 1 and 12.19 mgg 1 d 1(10-20 cm), significantly higher than those in the S1 site with the highest salinitydegree, which had 8.56 gkg1 and 1.41 mgg1d1(0-5 cm), 8.40 gkg1 and 1.30 mgg1d1(5-10 cm), and 8.33gkg1 and 1.26 mgg1d1(10-20 cm). The correlation analysis showed that in lower salinity areas, soil enzymeactivity had a significant or extremely significant positive correlation with most soil nutrients (P<0.05).Therefore, differences were observed in the characteristics of soil nutrients and enzyme activity in salt- affectedsoils of different degrees in the Qaidam Basin. Soil salinization reduces the effectiveness of soil nutrients, inhibitssoil enzyme activity, and reduces the decomposition rate of soil organic matter.