![]() These results indicated that the effects of inundation on the decay of labile and recalcitrant litter components were asynchronous. We observed a significant increase in the proportion of ketone, carboxyl, and alkyl in the permanently inundated litter samples compared with those of litters decomposed at terrestrial habitats at the final harvest. The δ 13C declined in the immersed litters and was stable after the litters were transported to the grassland plots, while δ 15N in the litters that were decomposing continually in the water rapidly increased during the earlier stage of decomposition. Inundation (permanent or temporary) and stranding altered litter C and N dynamics. ![]() Using litters of the grass species Heteropogon contortus, we studied how the remaining mass and nitrogen (N), δ 13C and δ 15N, and 13C-CPMAS NMR spectra responded to permanent inundation, temporary inundation and drying over a period of twelve months. Plant litter decomposition is a key process that determines the accumulation of soil organic matter in riparian ecosystems, but little is known about the alternating effects of inundation and stranding on this process. Inundation and stranding are important processes of the riparian ecosystem due to water level fluctuation.
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