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Soil dissimilatory nitrate reduction processes in the Spartina alterniflora invasion chronosequences of a coastal wetland of southeastern China: Dynamics and environmental implications

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Abstract

Aims

The invasion of Spartina alterniflora has a significant influence on soil biogeochemistry cycling in coastal wetlands. However, the roles of the S. alterniflora invasion chronosequence in regulating soil dissimilatory NO3 − reduction processes (denitrification (DNF), anaerobic ammonium oxidation (ANA) and dissimilatory nitrate reduction to ammonium (DNRA)) remains unclear. The objective of this study was therefore to reveal the effects of S. alterniflora invasion on the soil NO3 − reduction processes and associated gene abundance.

Methods

We investigated plant biomass, soil properties, NO3 − reduction processes and associated gene abundance of NO3 − reduction pathways following S. alterniflora invasion chronosequences of 6, 10, and 14 years compared to Cyperus malaccensis in a coastal wetland of southeastern China.

Results

The S. alterniflora invasion generally increased plant biomass, soil water content, available substrates, nirS, anammox bacterial 16S rRNA and nrfA gene abundance, but it decreased soil bulk density. Soil DNF, ANA and DNRA rates in stands of S. alterniflora ranged from 1.52 to 17.58, 0.31 to 1.27 and 0.14 to 2.01 nmol N g−1 h−1, respectively, which were generally higher than the values in stands of C. malaccensis. The soil NO3 − reduction rates generally increased with the increasing chronosequence of invasion by S. alterniflora, while the changes in DNF and ANA rates were less pronounced than changes in DNRA. DNF was the dominant pathway (70.00–92.41%), and the ANA and DNRA contributed 2.49–15.27% and 5.10–20.75% to the total NO3 − reduction, respectively. The contributions of DNF and ANA to the total NO3 − reduction decreased slightly, while the contribution of DNRA increased remarkably after S. alterniflora invasion. Soil NO3 − reduction processes were influenced by available substrates and associated microbial activities. It is estimated that an N loss of approximately 520.97 g N m−2 yr.−1 in C. malaccensis and 794.46 g N m−2 yr.−1 in S. alterniflora were linked to both DNF and ANA processes.

Conclusions

The S. alterniflora invasion altered soil NO3 − reduction processes by increasing soil microbial activities and available substrates and thus may further mediate the soil N availability in the coastal wetlands.

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Acknowledgments

This work was supported by the NSFC (grant numbers: 41130525; 41371451). We thank Shixue Wu for assistance the laboratory experiments and data analyses. Many thanks are given to anonymous reviewers and editor for constructive comments and valuable suggestions on this manuscript.

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Authors and Affiliations

  1. School of Geographic Sciences, East China Normal University, Shanghai, 200241, China

    Dengzhou Gao, Xiaofei Li, Xianbiao Lin, Dianming Wu, Yanping Huang, Min Liu & Xing Chen

  2. Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University, Shanghai, 200241, China

    Min Liu

  3. School of Resources and Environment Science, Anqing Normal University, Anqing, 246011, China

    Baoshi Jin

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  1. Dengzhou Gao
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Gao, D., Li, X., Lin, X. et al. Soil dissimilatory nitrate reduction processes in the Spartina alterniflora invasion chronosequences of a coastal wetland of southeastern China: Dynamics and environmental implications. Plant Soil 421, 383–399 (2017). https://doi.org/10.1007/s11104-017-3464-x

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