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.

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

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

scholarly journals Sediment release of dissolved organic matter to the oxygen minimum zone off Peru

2020 ◽  
Author(s):  
Alexandra N. Loginova ◽  
Andrew W. Dale ◽  
Frédéric A. C. LeMoigne ◽  
Sören Thomsen ◽  
Stefan Sommer ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Pore Water ◽  
Oxygen Minimum Zone ◽  
Water Interface ◽  
Sediment Release ◽  
Bottom Waters ◽  
Minimum Zone ◽  
Oxygen Minimum

Abstract. The eastern tropical South Pacific (ETSP) represents one of the most productive areas in the ocean that is characterized by a pronounced oxygen minimum zone (OMZ). Particulate organic matter (POM) that sinks out of the euphotic zone is supplied to the anoxic sediments and utilized by microbial communities. The degradation of POM is associated with dissolved organic matter (DOM) production and reworking. The release of recalcitrant DOM to the overlying waters may represent an important organic matter escape mechanism from remineralization within sediments but received little attention in OMZ regions so far. Here, we combine measurements of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) with DOM optical properties in the form of chromophoric (CDOM) and fluorescent (FDOM) DOM from pore waters and near-bottom waters of the ETSP off Peru. We evaluate diffusion–driven fluxes and net in situ fluxes of DOC and DON in order to investigate processes affecting DOM cycling at the sediment–water interface along a transect 12° S. To our knowledge, these are the first data for sediment release of DON and pore water CDOM and FDOM for the ETSP off Peru. Pore-water DOC and DON accumulated with increasing sediment depth, suggesting an imbalance between DOM production and remineralization within sediments. High DON accumulation resulted in very low pore water DOC / DON ratios (> 1) which could be caused by either an imbalance in DOC and DON remineralization, or to the presence of an additional nitrogen source. Diffusion driven fluxes of DOC and DON exhibited high spatial variability. They varied from 0.2–0.1 mmol m−2 d−1 to 2.52–1.3 mmol m−2 d−1 and from −0.042–0.02 mmol m−2 d−1 to 3.32–1.7 mmol m−2 d−1, respectively. Generally low net in situ DOC and DON fluxes as well as steepening of spectral slope (S) of CDOM and accumulation of humic-like FDOM at the near-bottom waters over time indicated active microbial DOM utilization at the sediment–water interface, potentially stimulated by nitrate (NO3−) and nitrite (NO2−). The microbial DOC utilization rates, estimated in our study, may be sufficient to support denitrification rates of 0.2–1.4 mmol m−2 d−1, suggesting that sediment release of DOM contributes substantially to nitrogen loss processes in the ETSP off Peru.

scholarly journals Sediment release of dissolved organic matter to the oxygen minimum zone off Peru

2020 ◽  
Vol 17 (18) ◽  
pp. 4663-4679
Author(s):  
Alexandra N. Loginova ◽  
Andrew W. Dale ◽  
Frédéric A. C. Le Moigne ◽  
Sören Thomsen ◽  
Stefan Sommer ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Pore Water ◽  
Nitrogen Loss ◽  
Oxygen Minimum Zone ◽  
Water Interface ◽  
Sediment Release ◽  
Minimum Zone ◽  
Oxygen Minimum

Abstract. The eastern tropical South Pacific (ETSP) represents one of the most productive areas in the ocean that is characterised by a pronounced oxygen minimum zone (OMZ). Particulate organic matter (POM) that sinks out of the euphotic zone is supplied to the anoxic sediments and utilised by microbial communities, and the degradation of POM is associated with the production and reworking of dissolved organic matter (DOM). The release of DOM to the overlying waters may, therefore, represent an important organic matter escape mechanism from remineralisation within sediments but has received little attention in OMZ regions so far. Here, we combine measurements of dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) with DOM optical properties in the form of chromophoric (CDOM) and fluorescent (FDOM) DOM from pore waters and near-bottom waters of the ETSP off Peru. We evaluate diffusion-driven fluxes and net in situ fluxes of DOC and DON to investigate processes affecting DOM cycling at the sediment–water interface along a transect at 12∘ S. To our knowledge, these are the first data for sediment release of DON and pore water CDOM and FDOM for the ETSP off Peru. Pore water DOC accumulated with increasing sediment depth, suggesting an imbalance between DOM production and remineralisation within sediments. High DON accumulation resulted in very low pore water DOC ∕ DON ratios (≤1) which could be caused by an “uncoupling” in DOC and DON remineralisation. Diffusion-driven fluxes of DOC and DON exhibited high spatial variability and ranged from 0.2±0.1 to 2.5±1.3 mmolm-2d-1 and from -0.04±0.02 to 3.3±1.7 mmolm-2d-1, respectively. Generally low net in situ DOC and DON fluxes, as well as a steepening of spectral inclination (S) of CDOM and an increase in humic-like DOM at the sediment–water interface over time, indicated active microbial DOM utilisation. The latter may potentially be stimulated by the presence of nitrate (NO3-) and nitrite (NO2-) in the water column. The microbial DOC utilisation rates, estimated in our study, are potentially sufficient to support denitrification rates of 0.2–1.4 mmolm-2d-1, suggesting that the sediment release of DOM may on occasion contribute to nitrogen loss processes in the ETSP off Peru.

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

An amendment to this paper has been published and can be accessed via the original article.

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