Distribution characteristics of catalase,phosphatase,urease,invertase and nitrate reductase activities in nine soil profiles at black belt in Heilongjiang province were studied.The results showed that five enzymatic activities reduced in turn from 0 cm to 40 cm layer but catalase,invertase,nitrate reductase activities got to stabilization or increased a little,while phosphatase,urease activities reduced sharply even to zero below 40 cm layer.Correlation analysis showed that there were notably correlation be...