吡唑醚菌酯在不同土壤中的吸附和降解及竹炭对其影响

The adsorption and degradation of pyraclostrobin in different soils and the impact of bamboo charcoal

为评价吡唑醚菌酯在不同土壤中的吸附和降解及竹炭对其影响,采用振荡平衡法和室内模拟试验开展了研究。结果表明,吡唑醚菌酯在土壤中的吸附符合Freundlich吸附方程,其在红土、黑土、水稻土、黄土和褐土中的Kd值分别为10.64、27.17、19.79、14.22和16.14,且与土壤有机质含量呈显著正相关(P<0.01);降解半衰期分别为17.77、12.60、13.33、16.91、15.40 d。在竹炭添加质量分数分别为0.1%、0.5%、1%、2%和5%的黑土处理中,其Kd值是未添加竹炭土壤的1.10、2.26、4.20、7.79、14.40倍,其半衰期较未添加竹炭的土壤分别延长了4.52、22.27、45.37、74.25、103.12 d。说明竹炭可促进农药在土壤中的吸附。

In order to evaluate the adsorption and degradation of pyraclostrobin in different soils,and the effect of bamboo charcoal on the the adsorption and degradation characteristics of pyraclostrobin in the spiked bamboo charcoal soils with different organic matter content,experiments were conducted using shaking balance method and indoor simulation experiment.The results showed that the adsorption of pyraclostrobin in all the treated soils conformed to the Freundlich adsorption equation.The Kd values of pyraclostrobin in red soil,black soil,paddy soil,loess and cinnamon soil were 10.64,27.17,19.79,14.22 and 16.14,respectively.There was a significant positive correlation between the Kd value and the content of soil organic matter(P<0.01).The half-lives of degradation of pyraclostrobin were 17.77,12.60,13.33,16.91 and 15.40 d,respectively in above soils.The Kd values of the soils spiked with 0.1%,0.5%,1%,2%and 5%mass fractions of bamboo charcoal were 1.10,2.26,4.20,7.79 and 14.40 times higher than those without bamboo charcoal.Compared with the soil without bamboo charcoal,the half-life increased by 4.52,22.27,45.37,74.25 and 103.12 d,respectively.Bamboo charcoal can enhance the adsorption of pesticides.