Abstract:

For the discussion of feasibility of taking the soil urease activities as the index of soil fertility levels, the author took the soil samples from 10 different types of land use in autumn, spring and summer in qingmuguan karst valley which was the research area, analyzed the soil urease activities and soil nutrient status of soil samples and used the correlation, path and principal component analysis to process the result. The results showed that the activity of urease had a significant correlation with the total nitrogen and available phosphorous and also related to the other soil nutrients. Directly and indirectly affected by the soil nutrients, the activity of urease could reflect the conditions of soil organics matter, total nitrogen and hydrolysable nitrogen. As a result, soil urease activities, to some extent, could be used as the index of soil fertility levels.