管理措施对水稻土中电子传输体系活性的影响

Electron transport system(ETS)/dehydrogenase activity in a paddy field soil was measured under a variety of incubation conditions using the reduction of 2-(p-iodophenyl-3-(p-nitrophenyl)-5-phenyl tetrazolium chloride(INT) to iodonitrotetrazolium formazan(INTF).The results exhibited a high positive correlation between the ETS activity and the incubation temperature and soil moisture,Dehydrogenase/ETS activity displayed a negative correlation with insecticide concentrations,and the activity affected adversely as the concentration of the insecticide increased.The hiher doses,5 and 10 field rates(1 field rate=1500mL ha^-1),of insecticide significantly inhibited ETS activity,while lower rates failed to produce any significant reducing effect,Inorganic N( as urea) of concentrations from 0 to 100ug N g^-1 soil showed a positive response to ETS activity,However,at concentrations of 200 and 400ug N g^-1,the activity was reduced significantly.

Effects of some management practices on electron transport system (ETS) activity in paddy soil

Electron transport system (ETS)/dehydrogenase activity in a paddy field soil was measured under a variety of incubation conditions using the reduction of 2-(p-iodophenyl-3-(p-nitrophenyl)-5-phenyl tetrazolium chloride (INT) to iodonitrotetrazolium formazan (INTF). The results exhibited a high positive correlation between the ETS activity and the incubation temperature and soil moisture. Dehydrogenase/ETS activity displayed a negative correlation with insecticide concentrations, and the activity affected adversely as the concentration of the insecticide increased. The higher doses, 5 and 10 field rates (1 field rate = 1500 mL ha-1), of insecticide significantly inhibited ETS activity, while lower rates failed to produce any significant reducing effect. Inorganic N (as urea) of concentrations from 0 to 100 μg N g-1 soil showed a positive response to ETS activity. However, at concentrations of 200 and 400μg N g-1, the activity was reduced significantly.