不同长残留除草剂对大豆根际土壤脲酶活性的影响

研究了咪唑乙烟酸、氯嘧磺隆和异(口恶)草酮3种大豆田长残留除草剂对土壤脲酶活性的影响.结果表明,3种长残留除草剂对大豆根际土壤脲酶活性的影响程度不同.咪唑乙烟酸、氯嘧磺隆、异(口恶)草酮施用后最初对脲酶活性均具有显著的抑制作用.但随着除草剂施用后时间的延长,咪唑乙烟酸处理土壤脲酶活性开始增强并与对照差异达到极显著水平;氯嘧磺隆处理土壤脲酶活性则逐渐恢复至正常状态;异(口恶)草酮处理土壤脲酶活性开始恢复时间最早,并且脲酶活性显著高于对照的持续时间最长.

INFLUENCE OF THREE LONG RESIDUAL HERBICIDES ON URASE ACTIVITY OF SOYBEAN RHIZOSPHERE SOIL

Effect of three kinds of widely used long residual herbicides Imazethapyr,Chlorimuron-ethyl , and Clomazone on the activity of soil urease in soybean farmland were researched. The results showed that there was a distinctly different effect on urease activity by the three different herbicides. Soil urease activity was significantly reduced by the three herbicides at the beginning of treatment, but with the time prolonging the urease activity of soil treated by Imazethapy was increased distinctly compare with control. The soil urease activity treated by Chlorimuron-ethyl retrieve to the normally level gradually, while that treated by Clomazone retrieve earlier than the other two herbicides and the urease activity distinctly higher than the control and remain long time.