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Contrasting resilience of soil microbial biomass, microbial diversity and ammonification enzymes under three applied soil fumigants
Journal of Integrative Agriculture ( IF 4.8 ) Pub Date : 2020-09-10 , DOI: 10.1016/s2095-3119(20)63201-4
Zhen-cai SUN , Gui-tong LI , Cheng-lei ZHANG , Zhi-min WANG , Qi-mei LIN , Xiao-rong ZHAO

Fumigation is a widely applied approach to mitigate the soil-borne diseases. However, the potential effects of currently applied fumigants on ammonification remain unclear. An 84-day incubation experiment was conducted based on non-fumigated soil (CK) and fumigated soil using three common fumigants, i.e., chloropicrin (CP), 1,3-dichloropropene (1,3-D), and metam sodium (MS). The results showed that, the three fumigants all decreased the microbial C, and the largest reduction (84.7%) occurred with the application of CP. After fumigation, the microbial diversity in the CP treatment rapidly recovered, but that in the 1,3-D treatment decreased and did not recover by the end of the experiment. The application of MS showed no impact on the microbial diversity during the assay, indicating that significantly different microbial diversity can be achieved by choosing different fumigants. Furthermore, the three fumigants showed divergent effects on the enzymes involved in ammonification. The analysis showed that the enzyme variation with CP application was mainly associated with the changed microbial C and N (P<0.05), and not with the microbial community, which was different from the observed effects of 1,3-D or MS application. In addition, the soil quality index showed that CP was still significantly harmful at the end of incubation compared with the good resilience of MS, indicating that CP may not be a suitable fumigant.



中文翻译:

三种施用土壤熏蒸剂对土壤微生物生物量,微生物多样性和氨化酶的反演力

熏蒸是减轻土壤传播疾病的一种广泛应用的方法。但是,目前使用的熏蒸剂对氨化的潜在影响仍不清楚。基于非熏蒸土壤(CK)和熏蒸土壤,使用三种常见的熏蒸剂,即氯化苦(CP),1,3-二氯丙烯(1,3-D)和间位钠(MS),进行了为期84天的培养实验)。结果表明,三种熏蒸剂均降低了微生物的碳含量,其中CP的施用量最大(84.7%)。熏蒸后,CP处理中的微生物多样性迅速恢复,但1,3-D处理中的微生物多样性下降,并且到实验结束时仍未恢复。MS的应用对测定过程中的微生物多样性没有影响,表明通过选择不同的熏蒸剂可以实现明显不同的微生物多样性。此外,这三种熏蒸剂对涉及氨化的酶显示出不同的作用。分析表明,施用CP时酶的变化主要与微生物C和N的变化有关(P <0.05),而不是与微生物群落有关,这与1,3-D或MS施用的观察到的效果不同。此外,土壤质量指数显示,与MS的良好回弹力相比,CP在温育结束时仍具有明显的危害性,表明CP可能不是合适的熏蒸剂。

更新日期:2020-09-11
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