扩蓄增容肥对土娄土土壤有机碳和氮的影响
Effect of amendment fertilizer on organic carbon and nitrogen in loess soil

【目的】研究扩蓄增容肥对土壤有机碳、氮含量的影响，为土壤扩蓄增容肥研发和施用提供科学依据。【方法】以有机页岩、油渣和无机化肥研制的有机无机复合型土壤扩蓄增容肥为供试肥料，采用田间试验与室内分析的方法，以不施肥为对照，比较扩蓄增容肥的不同施用量、扩蓄增容材料和传统施肥（无机化肥）对土娄土耕层土壤有机碳（SOC）、全氮(TN)、可溶性有机碳(DOC)、可溶性有机氮（DON）等不同形态碳氮含量的影响。【结果】与不施肥处理相比，传统施肥处理和扩蓄增容肥处理均可以提高土壤有机碳（SOC）、可溶性有机氮（DON）、NO3--N含量，而扩蓄增容肥处理还能够提高土壤易氧化有机碳（KMnO4 C）、可溶性有机碳（DOC）含量以及DOC/SOC。与传统施肥处理相比，扩蓄增容肥处理可明显提高土壤SOC和DOC含量。随着扩蓄增容肥施用量的提高，土壤SOC、TN含量明显升高，KMnO4 C有增加的趋势。所有施肥处理对土壤的微生物量碳（MBC）、微生物量氮（MBN）以及NH4+-N含量均没有产生显著影响。【结论】 扩蓄增容肥提高土壤SOC和DOC含量的作用较传统施肥明显，更有利于土壤肥力提升，且有效减少化肥投入并降低污染环境的风险。
【Objective】This study explored the effects of soil amendment fertilizer on soil organic carbon and nitrogen to provide scientific basis for development and application of soil amendment fertilizer.【Method】Using no fertilization as control,and organic and inorganic compound soil amendment fertilizer based on organic shale,oil residue and chemical fertilizers as treatments,effects of application amount,amendment material,and traditional fertilization (chemical fertilizers) on topsoil carbon and nitrogen contents including soil organic carbon (SOC),total nitrogen (TN),dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) in loess soil were studied by field experiment and lab analysis.【Result】Soil amendment fertilizer increased not only SOC,DON and NO3--N,which was similar with traditional fertilization,but also soil easily oxidized organic carbon (KMnO4 C),DOC and DOC/SOC,compared with no fertilization.Soil amendment fertilizer improved soil SOC and DOC significantly compared with traditional fertilization.Soil SOC and TN were increased significantly with the increase of application amount of soil amendment fertilizer,and KMnO4 C had an increasing tendency.All fertilization treatments had no significant effects on soil MBC,MBN and NH4+-N.【Conclusion】Soil amendment fertilizer had significant effect on boosting SOC and DOC,improving soil fertility,and decreasing chemical fertilizer input, and it would also reduce the risk of environment pollution compared with traditional fertilization