Highly reactive nanomineral assembly in soil colloids: Implications for paddy soil carbon storage
文献类型： 外文期刊
作者： Huang, Xiaolei 1 ; Kang, Wenjing 3 ; Guo, Junjie 3 ; Wang, Lei 4 ; Tang, Haiyan 3 ; Li, Tingliang 1 ; Yu, Guanghui 6 ; Ra 1 ;
作者机构： 1.Shanxi Agr Univ, Coll Resources & Environm, Taigu 080301, Shanxi, Peoples R China
2.Shanxi Agr Univ, Natl Expt Teaching Demonstrat Ctr Agr Resources &, Taigu 080301, Shanxi, Peoples R China
3.Nanjing Agr Univ, Jiangsu Collaborat Innovat Ctr Solid Organ Waster, Natl Engn Res Ctr Organ Based Fertilizers, Jiangsu Prov Key Lab Organ Solid Waste Utilizat, Nanjing 210095, Peoples R China
4.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Peoples R China
5.Minist Agr & Rural Affairs, Sci Observat & Expt Stn Arable Land Conservat Jia, Nanjing 210014, Peoples R China
6.Tianjin Univ, Inst Surface Earth Syst Sci, Tianjin 300072, Peoples R China
关键词： Organic fertilization; Organo-mineral complexes; Water-dispersible colloids; Paddy soil carbon storage
期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）
ISSN： 0048-9697
年卷期： 2020 年 703 卷
页码：
收录情况： SCI
摘要： Mineral availability for carbon (C) binding is a key regulator of soil C storage, yet little is known about the highly reactive nanomineral assembly in the paddy soil colloids. Here, using high-resolution transmission electron microscopy (HRTEM), solid-state Al-27 and Si-29 nuclear magnetic resonance (NMR) spectroscopy and X-ray photoelectron spectroscopy (XPS), we investigated the coordination nature of short-range-ordered (SRO) minerals in water-dispersible colloids that were isolated from the paddy soil under different six-year fertilization regimes. Our results showed that organic fertilization not only promoted the transformation of crystalline minerals to SRO phases in the bulk soils but also increased the concentrations of Fe, Al and Si in the soil colloids compared to chemical fertilization alone, and thus enhanced the accumulation of organic C in both the bulk soils and the soil colloids. The HRTEM images revealed that water-dispersible colloids in all soils, regardless of treatment, were composed of crystalline Fe nanominerals (with some Al/Si) and SRO-Al/Si nanominerals (with some Fe) associated with organic C. Furthermore, the combined results from the Al-27 and Si-29 NMR spectroscopy and XPS not only confirmed the presence of SRO-Al/Si nanoparticles as Si-rich allophane and phytolith but also demonstrated that organic fertilization promoted the transformation of aluminosilicates to SRO-Al/Si nanominerals in soil colloids. Together, these findings indicate that six-year organic fertilization promotes the formation of SRO minerals (e.g., ferrihydrite, Si-rich allophane and Fe-substituted allophane, as well as phytolith) in soils and modulates the assembly of organo-mineral complexes possibly by driving the biogeochemical cycles of Fe, Al, Si and specific organic ligands, thus contributing to the long-term storage of C in paddy soils. (C) 2019 Published by Elsevier B.V.
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