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研究报告

Effects of Fenton-like reactions on the organic carbon content in long-term fertilized soils

摘要：以吉林公主岭、江西进贤、湖南祁阳、辽宁沈阳农大等多地长期定位试验站的土壤为研究对象，结合原位微宇宙试验培养的土壤，探索类芬顿反应对长期施肥土壤中有机碳的影响.结果表明，长期施用化肥的土壤中自由基含量均显著低于长期施用有机肥的土壤.通过纳米粒子探针（NanoSIMS）发现，施用化肥的土壤中⁵⁶Fe¹⁶O^-的离子强度强于施用有机肥的土壤，根系和微生物的进入对土壤产生影响，在施用有机肥的土壤中，类芬顿反应能够增加碳、铁的移动性，微生物和根系的作用会加强铁矿物与有机碳的相关性，施用有机肥的土壤环境能够促进类芬顿反应的发生，有利于土壤有机碳的稳固和储存.上述研究结果有助于理解土壤有机碳稳定的机制以及类芬顿反应在土壤中发挥的潜力作用.

Abstract：In this study， both the long-term fertilization field experiments， at Gongzuling city， Jinxian city， Qiyang city and Shenyang Agricultural University， and in situ microcosm experiments were used to explore the effects of Fenton-like reactions on the organic carbon content in long-term fertilized soil. The results showed that the content of hydroxyl radicals in soils under long-term application of chemical fertilizer was significantly lower than that organic fertilizer. Using nanoscale secondary ion mass spectrometry （NanoSIMS）， the ionic strength of ⁵⁶Fe¹⁶O^-in the soil under long-term application of chemical fertilizer was stronger than that of organic fertilizer. The involvement of roots and microorganisms affects the Fenton-like reactions and ⁵⁶Fe¹⁶O in soils. Specifically， Fenton-like reactions can increase the mobility of carbon and iron in the long-term organic fertilized soils. The interaction of microorganisms and roots will strengthen the correlation between iron minerals and organic carbon. Applying organic fertilizers to the soil can promote the occurrence of Fenton-like reaction， which is further beneficial to the stabilization and storage of soil organic carbon. In summary， these findings are helpful to understand the mechanism of soil organic carbon stabilization and the potential role of Fenton-like reactions in soil.

Key words：soil fenton-like reactions free radical reaction organic carbon roots and microorganisms soil fertility