二甲戊灵对棉田土壤酶活性的影响

胡佳月; 金前; 贾会娟; 韩小强; 杨德松

doi:10.7671/j.issn.1001-411X.2017.03.010

二甲戊灵对棉田土壤酶活性的影响

Effect of pendimethalin on soil enzyme activities in cotton field

摘要

摘要:
目的研究新疆棉田土壤施用二甲戊灵对土壤酶活性的影响。
方法棉田土壤施用二甲戊灵0、2 700、4 050、5 400 g·hm^-2，分析不同处理时间、不同深度土壤酶活性的变化规律。
结果施用二甲戊灵后，土壤碱性磷酸酶活性明显被抑制，处理40 d后，5~10 cm土壤层碱性磷酸酶活性被抑制作用最强，二甲戊灵2 700、4 050、5 400 g·hm^-2处理的碱性磷酸酶活性抑制率分别为93.79%、90.77%、87.43%；脲酶活性总体表现激活趋势；蔗糖酶和脱氢酶活性随二甲戊灵浓度增高而增强，表层土壤酶活性较10~20 cm深层土壤激活作用显著；随着处理时间的增加，0~10 cm土壤层过氧化氢酶活性呈现先抑制后激活的趋势。
结论棉田土壤经二甲戊灵处理后，表现为脲酶、过氧化氢酶的激活效应；但二甲戊灵会抑制碱性磷酸酶活性，降低土壤有效磷素，长期施用会导致土壤营养失衡。

Abstract:
Objective To study the effects of pendimethalin on soil enzyme activities in cotton field.
Method Pendimethalin at different concentrations (0, 2 700, 4 050, 5 400 g·hm^-2) were applied to cotton field. Changes in soil enzyme activities at different soil depth and treatment time were investigated.
Result After treating with pendimethalin, alkaline phosphatase activity was substantially inhibited, and was inhibited the most at the soil depth of 5-10 cm 40 days after treatment.The inhibition rates of 2 700, 4 050 and 5 400 g·hm^-2 treatments were 93.79%, 90.77% and 87.43% respectively. Urease activity had been continuously activated. Sucrase and dehydrogenase activities increased with the concentration of pendimethalin increasing, and the enhancements of the soil surface were significantly stronger than those at the soil depth of 10-20 cm. Catalase at the soil depth of 0-10 cm was firstly inhibited and then activated with the treatment time increasing.
Conclusion Pendimethalin can activate urease and catalase, inhibit alkaline phosphatase, and reduce the soil available phosphorus content in cotton field. Long-term application of pendimethalin can cause soil nutrient imbalance.

HTML全文

参考文献(25)

施引文献

资源附件(0)