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Influence of surface soil chemistry on nutrient leaching from Japanese cedar plantations and natural forests

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Abstract

The tree species composition has a significant impact on the biogeochemical cycle of forest ecosystems, which in turn affects nutrient leaching and stream water quality. We have formulated a hypothesis that nutrient leaching varies depending on the tree species composition owing to the properties of surface soil chemistry characterized by the tree species composition. To test this hypothesis, we have collected soil water samples below the root zone in Japanese cedar plantations (CF) and natural forests (NF) and compared nutrient leaching. We analyzed major ion chemical characteristics, net N mineralization, and net nitrification in the surface soil (A layer) to determine possible causes for differences in nutrient leaching. Our results revealed that calcium (Ca2+) and nitrate (NO3) concentrations in soil water below the root zone were significantly higher in CF than in NF. Additionally, the Ca2+ and NO3 contents in surface soil were higher in CF than in NF, which may explain the higher concentrations of Ca2+ and NO3 in soil water in CF. In contrast, there was no significant difference in soil net nitrification rates between CF and NF. Correlations between NO3 and Ca2+ concentrations in soil solution suggest that the higher availability of Ca2+ from surface soils in CF could partially account for the higher NO3 leaching from CF. Our study suggests that the properties of surface soil chemistry characterized by the tree species composition are responsible for causing the differences in nutrient leaching.

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Acknowledgements

We thank Ms. Murata, who is the staff of Kyushu University Forest, for his assistance with fieldwork and for helpful discussions. We also thank Jun’ichiro Ide, Chitose Institute of Science and Technology, who helped with the samplings of the soil water. This study was supported financially by Grants-in-Aid for Scientific Research (17H03833 and 22H02386).

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Correspondence to Masaaki Chiwa.

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Liu, Y., Chiwa, M. Influence of surface soil chemistry on nutrient leaching from Japanese cedar plantations and natural forests. Landscape Ecol Eng 20, 187–194 (2024). https://doi.org/10.1007/s11355-023-00588-0

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  • DOI: https://doi.org/10.1007/s11355-023-00588-0

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