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Spatiotemporal variations affect uptake of inorganic and organic nitrogen by dominant plant species in an alpine wetland

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Abstract

Aims

Dominant plant species may coexist and maintain high productivity in alpine wetland through available nitrogen (N) niche differentiation over time and space. We tested the hypotheses that dominant plant species differ in uptake of inorganic and organic N and that such differences depend on soil depth and season.

Methods

We conducted a short-term 15N-labeling experiment in an alpine wetland on the Tibetan Plateau. The experiment used a factorial design with three N forms (nitrate, ammonium and glycine), three soil depths (0–5, 5–10 and 10–15 cm), two seasons (May and July) and three dominant species (Carex muliensis, C. lasiocarpa and Potentilla anserina).

Results

All three species took up organic N (glycine), but showed different patterns over seasons and depths. 15N uptake rate was higher in May than in July in C. muliensis and C. lasiocarpa, but lower in May than in July in P. anserina. C. muliensis took up more 15NH4 + and 15NO3 − than glycine-15N at all soil depths. C. lasiocarpa took up more glycine-15N than 15NH4 + or 15NO3 at 5–10 cm depth. P. anserina showed little difference in uptake at any soil depths.

Conclusions

Dominant species in alpine wetland are able to take up both organic and inorganic N, but show different patterns depending on N form, soil depth, season and their interactions.

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Acknowledgments

We thank Prof. Peter Alpert for his English improvement. We also thank the anonymous reviewers for constructive comments on the manuscript. This research is supported by the Fundamental Research Funds for the Central Universities (TD-JC-2013-1) and the National Natural Science Foundation of China (41071329 and 30870424).

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Authors and Affiliations

  1. School of Nature Conservation, Beijing Forestry University, Beijing, 100083, China

    Jun-Qin Gao, Yi Mo, Xue-Wen Zhang & Fei-Hai Yu

  2. Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China

    Xing-Liang Xu

Authors
  1. Jun-Qin Gao
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  2. Yi Mo
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  3. Xing-Liang Xu
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  4. Xue-Wen Zhang
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Correspondence to Fei-Hai Yu.

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Responsible Editor: Ad C. Borstlap.

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Gao, JQ., Mo, Y., Xu, XL. et al. Spatiotemporal variations affect uptake of inorganic and organic nitrogen by dominant plant species in an alpine wetland. Plant Soil 381, 271–278 (2014). https://doi.org/10.1007/s11104-014-2130-9

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  • DOI: https://doi.org/10.1007/s11104-014-2130-9

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