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Contrasting nitrate leaching from an abandoned Moso bamboo forest and a Japanese cedar plantation: role of vegetation in mitigating nitrate leaching

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Abstract

Aims

Nitrate (NO3) leaching from forest ecosystems can differ depending on the plant species because of differences in nitrogen (N) retention capacities. Moso bamboo, a fast-growth species, expands into adjacent forests worldwide, potentially leading to increased N retention and subsequently reduced NO3 leaching. Accordingly, this study aims to compare NO3 leaching and potential factors between Moso bamboo and neighboring forest.

Methods

We measured NO3 concentrations in soil solutions at a Moso bamboo site (BF) and an adjacent Japanese cedar plantation (CF). We also evaluated soil nitrification and plant N uptake by the in situ depletion method.

Results

The NO3 concentration in the soil solution below the root zone (50 cm) was lower in BF (48 ± 8 µmol L−1) than in CF (305 ± 16 µmol L−1). The NO3 concentration in the soil solution was significantly higher for surface soil (0–5 cm) (111 ± 11 µmol L−1) than for soil below the root zone in BF, but not significantly different between these two layers in CF (357 ± 25 µmol L−1), indicating high N retention in BF. The net nitrification rates and root NO3 uptake rates were higher in BF than in CF, indicating that plant N uptake could be the main contributors to the low NO3 leaching.

Conclusions

Bamboo invasion has the potential to mitigate forest NO3 leaching due to its high N uptake. Our findings highlight the importance of vegetation with higher N uptake in enhancing N retention under elevated atmospheric N deposition.

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Data availability

The data that support the findings of this study are available on request to the corresponding author.

References

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Acknowledgements

We thank the staff and students of the Laboratory of Ecohydrology, Kyushu University Forest, especially Hayato Abe, Tomonori Kume, and Kazushige Uemori, for their assistance with fieldwork and for helpful discussions. We also thank Karibu Fukuzawa of Hokkaido University, who helped with measurements of inorganic nitrogen in KCl extracted soil solution. We thank Jennifer Smith, PhD, from Edanz (https://jp.edanz.com/ac) for editing a draft of this manuscript.

Funding

This study was financially supported by JSPS KAKENHI Grant Number JP17H03833 and 22H02386 and JST SPRING, Grant Number JPMJSP2136.

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Authors and Affiliations

Authors

Contributions

MC and DF conceived and designed the experiments. DF and MC carried out the experiments and analyzed the data. DF wrote the manuscript with the help of MC. Both authors read, edited, and approved the manuscript.

Corresponding author

Correspondence to Masaaki Chiwa.

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Competing interests

The authors declare no conflict of interests.

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Responsible Editor: Wen-Hao Zhang.

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Supplementary file1 (DOCX 2787 KB)

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Fu, D., Chiwa, M. Contrasting nitrate leaching from an abandoned Moso bamboo forest and a Japanese cedar plantation: role of vegetation in mitigating nitrate leaching. Plant Soil 492, 229–240 (2023). https://doi.org/10.1007/s11104-023-06167-4

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  • DOI: https://doi.org/10.1007/s11104-023-06167-4

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