Depth Distribution of Bulk and Aggregate-Associated Manganese Oxides Mediated by Soil Chemical Properties in a Long-Term Fertilized Paddy Soil
文献类型： 外文期刊
作者： Anthonio, Christian Kofi 1 ; Jing, Huang 2 ; Tianfu, Han 1 ; Qaswar, Muhammad 1 ; Liu Kailou 3 ; Du Jiangxue 1 ; Khan, 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Engn Lab Improving Qual Arable Land, Beijing, Peoples R China
2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Observat Stn Qiyang Agriecol Syst, Qiyang 426182, Hunan, Peoples R China
3.Jiangxi Inst Red Soil, Natl Engn & Technol Res Ctr Red Soil Improvement, Nanchang 331717, Jiangxi, Peoples R China
4.Jiangxi Acad Agr Sci, Soil & Fertilizer & Resources & Environm Inst, Nanchang 330200, Jiangxi, Peoples R China
5.Henan Univ Sci & Technol, Coll Agr, Luoyang 471000, Peoples R China
关键词： Manganese oxides; Paddy soil aggregates; Depth distribution; Chemical properties
期刊名称：JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION （ 影响因子：3.872； 五年影响因子：3.771 ）
ISSN： 0718-9508
年卷期：
页码：
收录情况： SCI
摘要： Fertilization regimes greatly influence how manganese (Mn) oxides are recycled. However, information on this subject is scarce in rice managed paddies. The objective of this study was to examine the distributions of Mn pools in bulk soil and aggregates under different chemical and organic fertilizer ratios at both surface (0-20 cm) and subsurface (20-40 cm) soil depths. Depth distributions of Mn pools in bulk soil and aggregates were extracted using Mehlich 3 (M3-Mn), dithionite (Mnd), oxalate (Mno), and pyrophosphate (Mnp) solutions under a long-term fertilization experiment in a double rice cropping system. Fertilizer treatments comprised unfertilized control (CK), mineral nitrogen, phosphorus, and potassium (NPK), 30% mineral NPK + 70% organic fertilizer (30F; pig manure + milk vetch), 50% mineral NPK + 50% organic fertilizer (50F), and 70% mineral NPK + 30% organic fertilizer (70F) under a randomly complete block design (RCBD) in paddy conditions. A pattern of 30F > 50F > 70F > NPK > CK was established with positive and significant correlations among total organic carbon (TOC), total nitrogen (TN), and pH. All pools of Mn were in higher concentrations at the subsurface compared to the surface layer, where all aggregate sizes contributed equally to the enrichment of the metal oxides except for Mno in the 0.25-2.0 mm sizes at the surface layer. Distribution of manganese oxides was equal among the different soil aggregates which could cause the microaggregates to transport Mn oxides and pollute both surface and underground water sources.
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