Long‐term variability of nutrient and dissolved organic matter concentrations in Tokyo Bay between 1989 and 2015

2018 ◽  
Vol 64 (S1) ◽  
Author(s):  
Atsushi Kubo ◽  
Fuminori Hashihama ◽  
Jota Kanda ◽  
Naho Horimoto‐Miyazaki ◽  
Takashi Ishimaru
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Tokyo Bay

scholarly journals Assessing the Contribution of Seasonality, Tides, and Microbial Processing to Dissolved Organic Matter Composition Variability in a Southeastern U.S. Estuary

2021 ◽  
Vol 8 ◽  
Author(s):  
Rachel P. Martineac ◽  
Alexey V. Vorobev ◽  
Mary Ann Moran ◽  
Patricia M. Medeiros
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Critical Role ◽  
Bacterial Cells ◽  
Secondary Importance ◽  
Relative Contribution ◽  
Doc Concentration ◽  
Compositional Changes ◽  
Dom Composition

Uncovering which biogeochemical processes have a critical role controlling dissolved organic matter (DOM) compositional changes in complex estuarine environments remains a challenge. In this context, the aim of this study is to characterize the dominant patterns of variability modifying the DOM composition in an estuary off the Southeastern U.S. We collected water samples during three seasons (July and October 2014 and April 2015) at both high and low tides and conducted short- (1 day) and long-term (60 days) dark incubations. Samples were analyzed for bulk DOC concentration, and optical (CDOM) and molecular (FT-ICR MS) compositions and bacterial cells were collected for metatranscriptomics. Results show that the dominant pattern of variability in DOM composition occurs at seasonal scales, likely associated with the seasonality of river discharge. After seasonal variations, long-term biodegradation was found to be comparatively more important in the fall, while tidal variability was the second most important factor correlated to DOM composition in spring, when the freshwater content in the estuary was high. Over shorter time scales, however, the influence of microbial processing was small. Microbial data revealed a similar pattern, with variability in gene expression occurring primarily at the seasonal scale and tidal influence being of secondary importance. Our analyses suggest that future changes in the seasonal delivery of freshwater to this system have the potential to significantly impact DOM composition. Changes in residence time may also be important, helping control the relative contribution of tides and long-term biodegradation to DOM compositional changes in the estuary.

Structure and biodegradability of dissolved organic matter from Ultisol treated with long-term fertilizations

2018 ◽  
Vol 18 (5) ◽  
pp. 1865-1872 ◽  
Author(s):  
Peidong Xu ◽  
Jun Zhu ◽  
Qingling Fu ◽  
Jiazhou Chen ◽  
Hongqing Hu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter

Long-term biochar addition alters the characteristics but not the chlorine reactivity of soil-derived dissolved organic matter

2020 ◽  
Vol 185 ◽  
pp. 116260
Author(s):  
Wan Cai ◽  
Zhang-Liu Du ◽  
Ai-Ping Zhang ◽  
Chen He ◽  
Quan Shi ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter

Long-Term Nitrogen Addition Alters the Composition of Soil-Derived Dissolved Organic Matter

2019 ◽  
Vol 4 (2) ◽  
pp. 189-201 ◽  
Author(s):  
Jun-Jian Wang ◽  
Yina Liu ◽  
Richard D. Bowden ◽  
Kate Lajtha ◽  
André J. Simpson ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Nitrogen Addition

scholarly journals Simple Derivatization–Gas Chromatography–Mass Spectrometry for Fatty Acids Profiling in Soil Dissolved Organic Matter

Molecules ◽  
2020 ◽  
Vol 25 (22) ◽  
pp. 5278
Author(s):  
Neil Yohan Musadji ◽  
Claude Geffroy-Rodier
Keyword(s):  
Fatty Acids ◽  
Gas Chromatography ◽  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Climate Change Impacts ◽  
Major Change ◽  
Terrestrial Ecosystems ◽  
Gas Chromatography Mass Spectrometry ◽  
Global Carbon

Dissolved organic matter is an important component of the global carbon cycle that allows the distribution of carbon and nutrients. Therefore, analysis of soil dissolved organic matter helps us to better understand climate change impacts as it is the most dynamic and reactive fraction in terrestrial ecosystems. Its characterization at the molecular level is still challenging due to complex mixtures of hundreds of compounds at low concentration levels in percolating water. This work presents simple methods, such as thermochemolysis– or derivatization–gas chromatography, as an alternative for the analysis of fatty acids in dissolved organic matter without any purification step. The variables of the protocols were examined to optimize the processing conditions for the C9–C18 range. As a proof of concept, fatty acid distributions of soil percolating water samples from a long-term field experiment were successfully assessed. The variability of dissolved organic acid distributions was pronounced through depth profile and soil treatment but no major change in composition was observed. However, although the optimization was done from C9 to C18, detection within the C6-C32 fatty acids range was performed for all samples.

scholarly journals Predicting nitrogen and acidity effects on long-term dynamics of dissolved organic matter

2014 ◽  
Vol 184 ◽  
pp. 271-282 ◽  
Author(s):  
E.C. Rowe ◽  
E. Tipping ◽  
M. Posch ◽  
F. Oulehle ◽  
D.M. Cooper ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter
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