He Wen-xiang
2002
Citations
0
Influential Citations
6
Citations
Journal
Journal of Northwest Sci-Tech University of Agriculture and Forestry
Abstract
The fluctuations of soil enzyme activity under different dimehypo concentrations were studied in simulated conditions.The results showed that dimehypo could remarkably inhibit the activity of soil urease,polyphenol oxidase and peroxidase in Lou soil and Red soil sampled in North and South China,respectively,enzyme activity has largely inhibited at low dimehypo concentration,less inhibited at high dimehypo concentration.ED50,the ecological dimehypo dose at 50% reduction of soil enzyme activity,was calculated to express the sensitivity of soil enzyme to dimehypo.ED 50 of dimehypo for urease in Lou soil and Red soil were 1.301 and 0.526 g/kg respectively.It can be known according to ED 50 that soil urease is the most sensitive to dimehypo among all tested soil enzyme.It is very interesting that soil invertase is activated and its activity is enhanced at low concentration of dimehypo,and then is inhibited at high concentrations.