Sorption of paddy soil-derived dissolved organic matter on hydrous iron oxide–vermiculite mineral phases

Geoderma ◽  
2016 ◽  
Vol 261 ◽  
pp. 169-177 ◽  
Author(s):  
Marcella Sodano ◽  
Daniel Said-Pullicino ◽  
Antonio F. Fiori ◽  
Marcella Catoni ◽  
Maria Martin ◽  
...  
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Dissolved Organic Matter ◽  
Paddy Soil ◽  
Mineral Phases ◽  
Hydrous Iron Oxide

Facilitated Heterogeneous Photodegradation of Dissolved Organic Matter by Particulate Iron

2004 ◽  
Vol 1 (3) ◽  
pp. 197 ◽  
Author(s):  
Julia A. Howitt ◽  
Darren S. Baldwin ◽  
Gavin N. Rees ◽  
Barry T. Hart
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Dissolved Organic Matter ◽  
Iron Oxides ◽  
Aquatic Ecosystems ◽  
Photochemical Reactions ◽  
Freshwater Systems ◽  
Particulate Iron ◽  
Presence And Absence ◽  
Australian Freshwater

Environmental Context. Iron oxides, as suspended minerals or as a colloidal phase, are common in Australian freshwater systems. Freshwater systems are also loaded with carbon-based substances, ‘dissolved organic matter’, but not all is biologically available as food to freshwater organisms. However, photochemical interactions between these iron oxides and dissolved organic matter provide a mechanism for biologically resistant carbon to re-enter the food web. Suspended iron oxides thus need to be considered in carbon cycles in aquatic ecosystems. Abstract. The photochemical degradation of dissolved organic matter (DOM) derived from the leaves of River Red Gum (Eucalyptus camaldulensis) was examined, with a particular focus on the photochemical generation of CO2, consumption of O2, and the effect of particulate iron minerals on these photochemical reactions. Solutions of leaf leachate were irradiated with ultraviolet and visible light in the presence and absence of amorphous iron oxides. Addition of fresh iron oxide was found to increase the rate of photodegradation of the organic matter by up to an order of magnitude compared to the reactions without added iron oxide. The ratio of CO2 produced to O2 consumed was ~1:1 in both the presence and absence of iron oxyhydroxide. The reactivity of the iron oxides was dependent on the preparation method and decreased with increased storage time. These results suggest that photochemical reactions on particle surfaces should be considered when examining carbon transformation in aquatic ecosystems, especially at sites with potential for the production of iron oxyhydroxides.

Community dynamics of As(V)-reducing and As(III)-oxidizing genes during a wet–dry cycle in paddy soil amended with organic matter, gypsum, or iron oxide

2020 ◽  
Vol 393 ◽  
pp. 122485 ◽  
Author(s):  
Chaolei Yuan ◽  
Jiangtao Qiao ◽  
Fangbai Li ◽  
Xiaofeng Zhang ◽  
Yanhong Du ◽  
...  
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Paddy Soil ◽  
Community Dynamics

scholarly journals Phosphorus fertilization alters complexity of paddy soil dissolved organic matter

2020 ◽  
Vol 19 (9) ◽  
pp. 2301-2312
Author(s):  
Zhi-jian ZHANG ◽  
Xian-zhe WANG ◽  
Lu-yi LIANG ◽  
En HUANG ◽  
Xing-hua TAO
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Paddy Soil ◽  
Phosphorus Fertilization

scholarly journals Fluorescent characteristics of dissolved organic matter released from biochar and paddy soil incorporated with biochar

RSC Advances ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 5785-5793
Author(s):  
Jiakai Gao ◽  
Zhaoyong Shi ◽  
Haiming Wu ◽  
Jialong Lv
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Paddy Soil ◽  
Ecological Environment ◽  
Water Interface ◽  
Critical Part ◽  
Soil And Water

Dissolved organic matter (DOM) plays a critical part in many processes of the ecological environment due to its mobility and reactivity in the soil and water interface.

Photodegradation, interaction with iron oxides and bioavailability of dissolved organic matter from forested floodplain sources

2008 ◽  
Vol 59 (9) ◽  
pp. 780 ◽  
Author(s):  
Julia A. Howitt ◽  
Darren S. Baldwin ◽  
Gavin N. Rees ◽  
Barry T. Hart
Keyword(s):  
Organic Matter ◽  
Iron Oxide ◽  
Dissolved Organic Matter ◽  
Iron Oxides ◽  
Photochemical Reactions ◽  
Oxbow Lake ◽  
Photochemical Degradation ◽  
Fluorescence Excitation ◽  
Amorphous Iron ◽  
Leaf Leachate

Photochemical degradation of dissolved organic matter (DOM) can influence food webs by altering the availability of carbon to microbial communities, and may be particularly important following periods of high DOM input (e.g. flooding of forested floodplains). Iron oxides can facilitate these reactions, but their influence on subsequent organic products is poorly understood. Degradation experiments with billabong (= oxbow lake) water and river red gum (Eucalyptus camaldulensis) leaf leachate were conducted to assess the importance of these reactions in floodplain systems. Photochemical degradation of DOM in sunlight-irradiated quartz tubes (with and without amorphous iron oxide) was studied using gas chromatography and UV-visible spectroscopy. Photochemical reactions generated gaseous products and small organic acids. Bioavailability of billabong DOM increased following irradiation, whereas that of leaf leachate was not significantly altered. Fluorescence excitation-emission spectra suggested that the humic component of billabong organic matter was particularly susceptible to degradation, and the source of DOM influenced the changes observed. The addition of amorphous iron oxide increased rates of photochemical degradation of leachate and billabong DOM. The importance of photochemical reactions to aquatic systems will depend on the source of the DOM and its starting bioavailability, whereas inputs of freshly formed iron oxides will accelerate the processes.

scholarly journals Correction to: The chemodiversity of paddy soil dissolved organic matter correlates with microbial community at continental scales

Microbiome ◽  
2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Hong-Yi Li ◽  
Hang Wang ◽  
Hai-Tao Wang ◽  
Pei-Yong Xin ◽  
Xin-Hua Xu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Microbial Community ◽  
Dissolved Organic Matter ◽  
Paddy Soil

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