Abstract
Decomposition of Spartina anglica, Elytrigia pungens and Halimione portulacoides was studied for 20.5 months in situ in two habitats on a salt marsh in The SW Netherlands. Litter bags of three different mesh sizes were used to exclude meio- and/ or macrofauna. The middle-marsh habitat was flooded more frequently than the plant-debris habitat in the highest marsh zone. Decomposition of the three species followed an exponential pattern of decay: instantaneous decay rates varied from 0.0026 to 0.0054 per day. Decay rates were significantly influenced by habitat factors and fauna, while there was a significant interaction between plant species and habitat. In case of a significant meio- and/ or macrofauna effect, this became noticeable 12–16 weeks after the start of decomposition and resulted in a difference of 5–10% ash-free dry weight remaining after 20.5 months. Nematodes were the dominant microfaunal group in the plant litter. Densities were influenced by habitat conditions but not by resource quality, season and meio- and/ or macrofauna. Only initial C/ N and C/ P ratios were correlated with differences in decomposition rates between the plant species. During the later stages of decomposition N and P concentrations of the plant litter were higher in the plant-debris habitat than in the middle-marsh habitat, probably as a result of fluctuating detritivores densities. The course of the decomposition process differed per plant species and per habitat. The results of this study underline the importance of knowledge of long-term decomposition rates.
We are grateful to Ir P. F. M. Verdonschot for his help during the initial period of the experiment, Mr J. M. van Liere and Mrs C. H. Vos for their assistance in chemical analyzing the samples, Hanneke Keuning for assistance with the preparation of the manuscript, Mr A. A. Bolsius for drawing the figures, Dr A. G. Vlasblom for his help with the statistical analyses, and to Prof Dr M. J. A. Werger, Prof Dr E. van der Maarel, Dr Ir W. G. Beeftink, Dr A. H. L. Huiskes, Dr J. Rozema and Dr E. K. Duursma for critically reviewing the manuscript. The investigations were supported in part by the Foundation for Fundamental Biological Research (BION), of the Netherlands Organization for the Advancement of Pure Research (ZWO).
Communication Nr. 303 of the Delta Institute for Hydrobiologial Research, Yerseke.
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Buth, G.J.C., de Wolf, L. (1985). Decomposition of Spartina anglica, Elytrigia pungens and Halimione portulacoides in a Dutch salt marsh in association with faunal and habitat influences. In: Beeftink, W.G., Rozema, J., Huiskes, A.H.L. (eds) Ecology of coastal vegetation. Advances in vegetation science, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5524-0_38
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