Replication Data for: Condensed tannins mediate the effect of long-term nitrogen addition on soil nematodes in a boreal spruce forest

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Tonjer, Lea-Rebekka; Nybakken, Line; Birkemoe, Tone; Renčo, Marek; Ferdous, Zannatul; Asplund, Johan, 2023, "Replication Data for: Condensed tannins mediate the effect of long-term nitrogen addition on soil nematodes in a boreal spruce forest", https://doi.org/10.18710/IPOHNQ, DataverseNO, V1
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Description
This dataset contains data on soil condensed tannin concentrations, soil nematode communities and other soil variables, as well as condensed tannin concentrations of vaccinium myrtillus and picea abies leaves. The data were collected in 10 fertilized and 10 control plots in a long-term fertilization study site. (2023-07-04)
Abstract Fertilization and combustion of fossil fuels have increased nitrogen (N) deposition over the last decades. Most boreal forests are N-limited; thus, increased N availability may have considerable implications for boreal forest food web structure and functioning. Soil biota are important drivers of ecosystem processes through their effect on carbon (C) and nutrient cycling. Among these, nematodes are ubiquitous in soil and respond quickly to environmental changes. They are thus useful in determining changes in ecosystem status. Boreal forest plants produce large quantities of condensed tannins (hereafter tannins), and these may decrease following N addition. As defence compounds, tannins may alter soil community structure by reducing microbial activity and deter microfauna. Using nematodes as indicators, we here investigated the linkages between N-induced changes in soil food web and soil tannin concentration. We utilized an experimental site where N has been added since 2003 at a rate of ca. 150 kg N ha−1 year−1. This have resulted in a shift in the understory, and consequently a 23 % lower soil tannin concentration. Fertilization led to a less structured nematode community dominated by bacterivores. Channel Index was 35 % lower in fertilized plots, indicating an increasing decomposition dominance by bacteria. Furthermore, the dominance of bacteria appears to have been inhibited by soil tannin concentrations in the fertilized plots. Overall, our study demonstrate that soil community structure strongly changes upon increased N availability, and lower soil tannin concentrations further facilitate the dominance of bacteria. (2023-08-21)
Subject Earth and Environmental Sciences
Keyword Condensed tannins, Nematodes, Boreal forests, Fertilization
Related Publication Lea-Rebekka Tonjer, Line Nybakken, Tone Birkemoe, Marek Renčo, Zannatul Ferdous and Johan Asplund (2023) Condensed tannins mediate the effect of long-term nitrogen addition on soil nematodes in a boreal spruce forest, Forest Ecology and Management doi: 10.1016/j.foreco.2023.121248
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