Changes in the quality of chromophoric dissolved organic matter leached from senescent leaf litter during the early decomposition

Journal of Environmental Quality
Satoshi NishimuraEikichi Shima

Abstract

Chromophoric dissolved organic matter (CDOM) leached from leaf litter is a major source of humus in mineral soil of forest ecosystems. While their functions and refractoriness depend on the physicochemical structure, there is little information on the quality of CDOM, especially for that leached in the very early stages of litter decomposition when a large amount of dissolved organic matter (DOM) is leached. This study aimed to better understand the variations/changes in the composition of CDOM leached from senescent leaf litter from two tree species during the early stage of decomposition. Leaf litter from a conifer tree (Japanese cedar, D. Don) and a deciduous broad-leaved tree (Konara oak, Thunb.) were incubated in columns using simulated rainfall events periodically for a total of 300 d at 20°C. The quality of CDOM was investigated based on the fluorescence properties by using a combination of excitation-emission matrix fluorescence (EEM) and parallel factor analysis (PARAFAC). In addition, the phenolic composition of DOM was investigated at a molecular level by thermally assisted hydrolysis and methylation-gas chromatography-mass spectrometry (THM-GC-MS) in the presence of tetramethylammonium hydroxide (TMAH). The EEM was ...Continue Reading

References

Sep 1, 2005·Analytical Chemistry·Klaas G J NieropJoeri Kaal
Nov 22, 2005·Environmental Science & Technology·Rose M Cory, Diane M McKnight
Aug 15, 2009·Applied Spectroscopy·A J Lawaetz, C A Stedmon

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