Changes in the Quality of Chromophoric Dissolved Organic Matter Leached from Senescent Leaf Litter during the Early Decomposition

2012 ◽  
Vol 41 (3) ◽  
pp. 823-833 ◽  
Author(s):  
Satoshi Nishimura ◽  
Nagamitsu Maie ◽  
Mitsuhisa Baba ◽  
Takahiro Sudo ◽  
Toshihiro Sugiura ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Leaf Litter ◽  
Chromophoric Dissolved Organic Matter ◽  
Senescent Leaf

scholarly journals Insights on Dissolved Organic Matter Production Revealed by Removal of Charge-Transfer Interactions in Senescent Leaf Leachates

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2356
Author(s):  
Karl M. Meingast ◽  
Brice K. Grunert ◽  
Sarah A. Green ◽  
Evan S. Kane ◽  
Nastaran Khademimoshgenani
Keyword(s):  
Organic Matter ◽  
Charge Transfer ◽  
Dissolved Organic Matter ◽  
Leaf Litter ◽  
Fluorescence Emission ◽  
Reference Standards ◽  
Quantum Yields ◽  
Electronic Interaction ◽  
Biological Index ◽  
Senescent Leaf

Dissolved organic matter (DOM) is a critical part of the global carbon cycle. Currently, it is understood that at least a portion of the chromophoric DOM (CDOM) character can be described through an electronic interaction of charge transfer (CT) complexes. While much work has been done to understand the influence of CT on soil and aquatic reference standard DOM, little is known about the influence of CT in fresh terrestrially derived DOM. In this study, leaf litter leachates from three tree species were treated (reduced) with sodium borohydride to determine the contribution of CT on a source of fresh terrestrial DOM. Leaf litter was sampled four times through decomposition under natural (field) conditions to determine the influence of degradation on response to borohydride treatment. Leaf litter CDOM displayed a unique loss of UVB absorption following borohydride treatment, as well as a homogenizing effect on fluorescence emission character. Humification index (HIX) differentiated Elliot Soil Humic Acid and Suwannee River Fulvic Acid from leaf litter leachates. However, biological index (BIX), and spectral slope metrics were not able to differentiate leaf leachates from these reference standards. Apparent quantum yields were similar in magnitude between leaf leachates and reference standards, although leaf leachate spectra displayed features not evident in reference standards. These results help understand the origins of DOM optical properties and associated quantitative indices in freshly sourced terrestrial material. Overall, these results suggest that even at the initial stages of decomposition, terrestrial CDOM exhibits optical characteristics and responses to removal of electron accepting ketones and aldehydes, through borohydride treatment, similar to more processed CDOM.

Photobleaching kinetics of chromophoric dissolved organic matter derived from mangrove leaf litter and floating Sargassum colonies

2010 ◽  
Vol 119 (1-4) ◽  
pp. 162-171 ◽  
Author(s):  
G. Christopher Shank ◽  
Richard G. Zepp ◽  
Anssi Vähätalo ◽  
Rosalynn Lee ◽  
Erich Bartels
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Leaf Litter ◽  
Chromophoric Dissolved Organic Matter ◽  
Kinetics Of

Production of chromophoric dissolved organic matter from mangrove leaf litter and floating Sargassum colonies

2010 ◽  
Vol 119 (1-4) ◽  
pp. 172-181 ◽  
Author(s):  
G. Christopher Shank ◽  
Rosalynn Lee ◽  
Anssi Vähätalo ◽  
Richard G. Zepp ◽  
Erich Bartels
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Leaf Litter ◽  
Chromophoric Dissolved Organic Matter

scholarly journals Posidonia oceanica as a Source of Chromophoric Dissolved Organic Matter for the Oligotrophic NW Mediterranean Coast

2020 ◽  
Vol 8 (11) ◽  
pp. 911
Author(s):  
Francesca Iuculano ◽  
Carlos M. Duarte ◽  
Jaime Otero ◽  
Xosé Antón Álvarez-Salgado ◽  
Susana Agustí
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Rocky Shore ◽  
Posidonia Oceanica ◽  
Mediterranean Coast ◽  
Balearic Islands ◽  
Chromophoric Dissolved Organic Matter ◽  
Absorption Increase ◽  
Seagrass Meadows ◽  
Nw Mediterranean

Posidonia oceanica is a well-recognized source of dissolved organic matter (DOM) derived from exudation and leaching of seagrass leaves, but little is known about its impact on the chromophoric fraction of DOM (CDOM). In this study, we monitored for two years the optical properties of CDOM in two contrasting sites in the Mallorca Coast (Balearic Islands). One site was a rocky shore free of seagrass meadows, and the second site was characterized by the accumulation of non-living seagrass material in the form of banquettes. On average, the integrated color over the 250–600 nm range was almost 6-fold higher in the beach compared with the rocky shore. Furthermore, the shapes of the CDOM spectra in the two sites were also different. A short incubation experiment suggested that the spectral differences were due to leaching from P. oceanica leaf decomposition. Furthermore, occasionally the spectra of P. oceanica was distorted by a marked absorption increase at wavelength < 265 nm, presumably related to the release of hydrogen sulfide (HS−) associated with the anaerobic decomposition of seagrass leaves within the banquettes. Our results provide the first evidence that P. oceanica is a source of CDOM to the surrounding waters.

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