二甲戊乐灵的土壤微生物生态效应

研究了二甲戊乐灵对土壤微生物活性的影响.结果表明:二甲戊乐灵1、5、10μg·g^-113个浓度处理所释放的CO2与对照无明显差异;该药对纤维素在土壤中的降解表现出促进作用,纤维素在5和10μg·g^-12处理中的半衰期分别比CK提高1.32和2.14倍;二甲戊乐灵对脱氢酶的活性有一定的激活作用,其激活强度和作用时间随处理浓度升高而加剧和延长;二甲戊乐灵对土壤脲酶的影响表现出先抑制后激活的现象,抑制和激活的程度及持续的时间与处理浓度成正比.

Ecological Effect of Pendimethalin on Soil Microbe

The effect of pendimethalin, a herbicide, on microbial activity in soil was studied here. The results showed that the amount of emission CO2 from three treatment of 1, 5 and 10 micrograms.g-1 of pendimethalin had no significant differences from the CK. The study of the influences on the degradation of the cellulose demonstrated that pendimethalin can stimulate the cellulose degradation in the soil. In contrast to the CK, the half-life (T0.5) of 5, 10 micrograms.g-1 treatments were increased to 1.32 times and 2.14 times, respectively. The activities of dehydrogenase were activated in some degrees, and the higher the pendimethalin concentration the greater and longer the influence. The results also showed that the soil urease activity was restrained, and then, was stimulated by pendimethalin. The level and the sustained time of inhibition and stimulation was proportional to the concentration of the treatment.