论文部分内容阅读
通过盆栽小麦试验,研究了苯磺隆污染对土壤尿酶、碱性磷酸酶和蛋白酶活性的动态影响。结果表明,苯磺隆处理前期(14d前)对土壤脲酶活性具有抑制作用(除第1天0.1、0.5mg/kg处理),且抑制作用随着苯磺隆浓度的增大而增强,第7天脲酶活性最小,最大抑制率为74.8%;处理后期(14d后)对脲酶活性具有一定的激活作用,最高激活率达183.0%。而低浓度苯磺隆对土壤碱性磷酸酶和蛋白酶具有一定的激活效应,高浓度苯磺隆对土壤碱性磷酸酶和蛋白酶具有抑制-激活效应,对碱性磷酸酶的抑制作用表现在处理的最初7d,对蛋白酶的抑制作用表现在处理前期(14d前)。结果表明苯磺隆对土壤酶活性的影响不仅与苯磺隆处理的浓度和培养时间有关,同时还与土壤酶的种类有关,土壤尿酶活性对表征苯磺隆污染具有一定的指示作用。
The pot experiment was conducted to study the dynamic effects of tribenuron-methyl on soil urease, alkaline phosphatase and protease activities. The results showed that before the treatment of tribenuron-methyl (pre-14d), the soil urease activity was inhibited (except 0.1 and 0.5mg / kg on the first day), and the inhibition increased with the increase of the concentration of tribenuron-methyl The urease activity was the lowest, with the maximum inhibition rate of 74.8%. After the treatment (after 14 days), urease activity had a certain activation, the highest activation rate reached 183.0%. The low concentration of tribenuron-methyl had certain activation effect on soil alkaline phosphatase and protease. The high concentration of tribenuron-methyl inhibited the activation of alkaline phosphatase and protease, while the inhibition of alkaline phosphatase was treated Of the first 7d, the inhibition of protease in the pre-treatment (14d). The results showed that the effect of tribenuron-methyl on soil enzyme activity was not only related to the concentration and incubation time of tribenuron-methyl, but also to the types of soil enzymes. Soil urease activity was indicative of tribenuron-methyl pollution.