| Activities of soil enzymes were measured for the five vegetation types (Nitraria sibirica,Triticum aestivuml, Medicago sativa, Cuminum cyminum, and Foeniculum vulgare) in Shulehe River Basin. The results showed that activities of soil enzymes including urease, alkaline phosphatase, nitrate reductase, dehydrogenase, and catalase increased significantly after planting different vegetations. Enzyme activities in the 0～20 cm soil layer were higher than those in the 20～40 cm soil layer. Alfalfa soil had the highest urease and nitrate reductase contents, increased by 77.88% and 156.94% compared with CK, respectively. Cumin soil had the highest alkaline phosphatase conte
nt, being 4.43 times than CK, and wheat soil had the highest dehydrogenase and catalase activities, being 112.72% and 51.00% greater than CK, respectively. Correlation analysis showed that there existed significant correlations among the dehydrogenase, alkaline phosphatase, and catalase. There were significant differences in enzyme activities between five tested vegetation types, but it varied with growing seasons, indicating that the enzyme activities should be an important index for soil fertility. |