Crop effect on the relationship between soil urease activity and mercury

It is important to study the relationship among soil enzyme,crop and mercury,because mercury has remarkable influence not only on soil quality,but also on the product and quality of crops.Their relationship is investigated by dynamic idea and simulated method.The results show as the followings:Hg obviously inhibited soil urease activity and crop root activity under soil crop agricultural system;Crop could enhance soil urease activity and reduce Hgs inhibition because the urease activity of rhizosphere soil is higher than that of non rhizosphere soil.Rhizosphere is a region that is a zone of the highest bioactivity and sensitivest to Hg.