改良剂对镉胁迫莴苣根际土壤酶活性的影响

Effects of Amendments on Rhizosphere Soil Enzyme Activity of Lettuce Under Cadmium Stress

采用根袋法盆栽试验,研究了石灰、猪粪和过磷酸钙3种改良剂对镉胁迫莴苣根际土壤过氧化氢酶、土壤脲酶、土壤蔗糖酶和土壤淀粉酶活性的影响。结果表明:种植莴苣前和莴苣成熟期,3种改良剂均显著或极显著提高了土壤酶活性,且最大值均出现在高浓度猪粪处理中。种植莴苣前土壤过氧化氢酶、土壤脲酶、土壤蔗糖酶和土壤淀粉酶活性最大值分别为2.35mL/g、8.51mg/g、12.8mg/g和0.49mg/g;莴苣成熟期,莴苣根际土壤过氧化氢酶、土壤脲酶、土壤蔗糖酶和土壤淀粉酶活性最大值分别为1.89mL/g、13.67mg/g、12.65mg/g和0.66mg/g。因此,猪粪对改善镉胁迫莴苣土壤生态环境的效果优于石灰和过磷酸钙。

The pot experiment of root bag method was used to study the effects of 3 amendments（the lime,the pig manure and the superphosphate）on rhizosphere soil enzyme（the soil catalase,the soil urease,the soil invertase and the soil amylase）activities of lettuce under Cd stress.The results showed that three amendments significantly or very significantly improved four soil enzymes activities of lettuce before lettuce growth and at lettuce maturity stage,and the maximum was in high concentration of pig manure treatment.Before lettuce growth,the maxima of soil catalase,soil urease,soil invertase and soil amylase activities were 2.35 mL/g,8.51 mg/g,12.8 mg/g and 0.49 mg/g,respectively.At mature stage of lettuce,the maxima of lettuce rhizosphere soil catalase,soil urease,soil invertase and soil amylase activities were 1.89 mL/g,13.67 mg/g,12.65 mg/g and 0.66 mg/g,respectively.Therefore,the pig manure was better to improve lettuce soil environment under Cd stress than lime and superphosphate.