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Soil mesofauna dynamics,wheat residue decomposition and nitrogen mineralization in buried litterbags
Authors:M. J. Vreeken-Buijs  L. Brussaard
Affiliation:(1) DLO Research Institute for Agrobiology and Soil Fertility, PO Box 129, NL-9750 AC Haren, The Netherlands;(2) Present address: Department of Terrestrial Ecology and Nature Conservation, Wageningen Agricultural University, Bornsesteeg 69, NL-6708 PD Wageningen, The Netherlands
Abstract:The effect of soil microarthropods and enchytraeids on the decomposition of wheat straw in buried litterbags was studied by selective admission and exclusion. Litterbags with 20 mgrm mesh size admitted nematodes, but excluded microarthropods, although temporarily. After 27 weeks of incubation part of these litterbags were colonized, probably through egg-deposition of mainly fungivorous Collembola and mites. When litterbags with a complete microarthropod community (1.5 mm mesh size) were compared to litterbags with strongly reduced microarthropod numbers (20 mgrm mesh size), no differences between decomposition rates were found. However, in colonized 20-mgrm mesh bags, we found reduced decomposition rates compared to the coarse mesh litterbags, probably due to overgrazing of the fungal population by large numbers of fungivorous microarthropods. These large numbers might be caused by the absence of predators. Extraction of microarthropods as well as enchytraeids and nematodes from the coarse mesh litterbags showed a distinct succession during decomposition. The decomposition process was dominated in the first phase by bacterivorous nematodes, nematophagous and bacterivorous mites, and in the later phase by fungivorous nematodes, fungivorous and omnivorous mites and Collembola, and predatory mites. This succession is indicative of a sequence from bacterial to fungal dominated decomposition of the buried organic matter. The results indicate that the decomposition rate is predator controlled.
Keywords:Mites  Collembola  Litterbags  Decomposition  Mineralization  Succession  Soil mesofauna  Trophic interactions
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