Persistence of repeated triadimefon application and its impact on soil microbial functional diversity
Persistence of repeated triadimefon application and its impact on soil microbial functional diversity
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DOI：
10.1080/03601234.2012.616775
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发表时间：
2012-01
期刊：
影响因子：
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通讯作者：
H. Fang;Feifan Tang;W. Zhou;Zhengya Cao;Dan Wang;Kailin Liu;Xiangwei Wu;Y. Yu
中科院分区：
文献类型：
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作者：
H. Fang;Feifan Tang;W. Zhou;Zhengya Cao;Dan Wang;Kailin Liu;Xiangwei Wu;Y. Yu
在实验室条件下，研究了三唑酮在农田土壤中重复施用对土壤微生物功能多样性的影响以及对三唑酮在土壤中持效性的影响。三唑酮在推荐剂量下第一次、第二次和第三次施药的降解半衰期分别为23.90、22.95和21.52天，采用一级动力学模型进行模拟。在整个研究中，未观察到Shannon-Wiener指数（H′）的显著抑制。而Simpson指数（1/D）和McIntosh指数（U）在施用后的前3d内明显降低（p ≤ 0.05），此后逐渐恢复到或超过对照土壤水平。在第二次和第三次施用三唑酮后，分别观察到类似的变化趋势，但1/D和U的恢复更快。以上结果表明，重复施用三唑酮提高了杀菌剂的降解率和土壤微生物功能多样性的恢复率。结果表明，重复施用三唑酮对土壤微生物群落具有短暂的抑制作用。
The effects of repeated applications of the fungicide triadimefon in agricultural soil on the microbial functional diversity of the soil and on the persistence of the fungicide in the soil were investigated under laboratory conditions. The degradation half-lives of triadimefon at the recommended dosage, simulated by a first-order kinetic model, were 23.90, 22.95, and 21.52 days for the first, second, and third applications, respectively. Throughout this study, no significant inhibition of the Shannon-Wiener index (H′) was observed. However, the Simpson index (1/D) and the McIntosh index (U) were obviously reduced (p ≤ 0.05) during the initial 3 days after the first triadimefon application and thereafter, gradually recovered to or exceeded the level of the control soil. A similar trend in variation but with a faster recovery in the 1/D and U was observed after the second and third triadimefon applications, respectively. Taken together, the above results indicate that the repeated application of triadimefon enhanced the degradation rate of the fungicide and the recovery rate of the soil microbial functional diversity. It is concluded that repeated triadimefon applications in soil have a transient or temporary inhibitory effect on soil microbial communities.