Negative responses of Collembola in a forest soil (Alptal, Switzerland) under experimentally increased N deposition
2009
Xu, Guo-Liang | Schleppi, Patrick | Li, Mai-He | Fu, Sheng-Lei
The response of specific groups of organisms, like Collembola to atmospheric nitrogen (N) deposition is still scarcely known. We investigated the Collembola community in a subalpine forest (Alptal, Switzerland) as subjected for 12 years to an experimentally increased N deposition (+25 on top of ambient 12 kg N ha⁻¹ year⁻¹). In the 0-5 cm soil layer, there was a tendency of total Collembola densities to be lower in N-treated than in control plots. The density of Isotomiella minor, the most abundant species, was significantly reduced by the N addition. A tendency of lower Collembola group richness was observed in N-treated plots. The Density-Group index (dDG) showed a significant reduction of community diversity, but the Shannon-Wiener index (H') was not significantly affected by the N addition. The Collembola community can be considered as a bioindicator of N inputs exceeding the biological needs, namely, soil N saturation. Collembola community, which was significantly affected by a long-term N addition experiment, can be considered as a bioindicator of N saturation.
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