Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1007/s10533-021-00799-3
Lizenz creative commons licence
Titel (primär) Impacts of litter decay on organic leachate composition and reactivity
Autor Hensgens, G.; Lechtenfeld, O.J.; Guillemette, F.; Laudon, H.; Berggren, M.
Journal / Serie Biogeochemistry
Erscheinungsjahr 2021
Department ANA
Band/Volume 154
Seite von 99
Seite bis 117
Sprache englisch
Topic T9 Healthy Planet
Keywords Dissolved organic matter; Litter leaching; Reactivity; Decomposition; FT-ICR MS; Boreal; DOM; DOC
UFZ Querschnittsthemen ProVIS;
Abstract Litter decomposition produces labile and recalcitrant forms of dissolved organic matter (DOM) that significantly affect soil carbon (C) sequestration. Chemical analysis of this DOM can provide important knowledge for understanding soil DOM dynamics, but detailed molecular analyses on litter derived DOM are scarce. Here we use ultrahigh resolution mass spectrometry (FT-ICR MS) to characterize the molecular composition of DOM from fresh and progressively decomposed litter samples. We compared high reactive (HR) and low reactive (LR) litter sources with regard to changes in the chemistry and bioavailability of leachates throughout the early phase of litter decay. We show that litter reactivity is a driver of chemical changes in the leached DOM of litter species. Birch, alder and Vaccinium (i.e. HR) litter initially produced more DOM with a higher lability than that of spruce, pine and wood (i.e. LR) litter. Labile oxidized phenolic compounds were abundant in leachates produced during the initial HR litter decay stages, indicating litter lignin degradation. However, the similarity in chemistry between HR and LR leachates increased during the litter decay process as highly leachable structures in HR litter were depleted. In contrast, chemistry of leachates from LR litter changed little during the litter decay process. The oxygenated phenolic compounds from HR litter were driving the lability of HR leachates and the changes in relative abundance of molecules during DOM incubation. This appeared to result in the creation of stable aliphatic secondary microbial compounds. In LR leachates, lability was driven by labile aliphatic compounds, while more resistant phenolic compounds were associated with recalcitrance. These results show how DOM dynamics follow different paths depending on litter reactivity, which has important implications for soil biogeochemistry and C sequestration.
dauerhafte UFZ-Verlinkung
Hensgens, G., Lechtenfeld, O.J., Guillemette, F., Laudon, H., Berggren, M. (2021):
Impacts of litter decay on organic leachate composition and reactivity
Biogeochemistry 154 , 99 - 117