Soil enzyme and soil nutrient were analyzed to investigate spatial distribution and the influencingfactors for soil enzyme activities in surface soil(0-20cm)of sloping farmland in Dongshan watershed

whichis belonging to the northeast black soil area.The results showed that converting enzyme

urease

alkalinephosphatase activity were higher in lower reaches than in upper and middle reaches.The three soil enzymeactivities on the slopes in the erosional area were less than those in the depositional area.Soil enzyme activities varied significantly with regard to slop positions;it was relatively high on the crest

low in middle slope

and the highest in the foot slope

corresponding to soil erosion intensity.The converting enzyme

urease

alkaline phosphatase activities were correlated positively with each other.The spatial distribution characteristics of soil enzyme activities matched that of soil erosion intensity very well on the slope and watershed.The results indicated that soil erosion reduced soil enzyme activities.