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Article

Variation in Foliar ẟ15N Reflects Anthropogenic Nitrogen Absorption Potential of Mangrove Forests

1
Graduate School of Agriculture, Tokyo University of Agriculture, 1-1-1 Sakuragaoka, Setagaya-Ku, Tokyo 156-8502, Japan
2
Department of Soil and Environmental Sciences, University of Barishal, Karnokathi, Barishal 8200, Bangladesh
*
Author to whom correspondence should be addressed.
Forests 2020, 11(2), 133; https://doi.org/10.3390/f11020133
Received: 3 December 2019 / Revised: 16 January 2020 / Accepted: 20 January 2020 / Published: 22 January 2020
(This article belongs to the Section Forest Ecology and Management)
Research Highlights: Mangrove forests are absorbing anthropogenically produced excess nitrogen under moderate to intensive human interaction in the study sites, further indicating the degree of deviation from the natural ecosystem condition. Background and Objectives: Mangrove species, when directly connected to anthropogenic activities such as sewage disposal, agricultural inputs, and receiving of animal manure, absorb excess nutrients from the systems and act as ecological indicators of long-term natural changes. However, there is a paucity of examples of how the mangroves respond to a land-use gradient comparing to the non-mangrove plants under indirect anthropogenic impacts. Materials and Methods: In this investigation, foliar total nitrogen (N), carbon to nitrogen (C/N) ratio, and δ15N of mangrove and non-mangrove species collected from 15 watersheds on three islands in Okinawa, Japan, have been compared. The land-use areas in the study watersheds were delineated by ArcGIS software, and the correlation between the foliar traits and the human-affected area ratios were examined. Results: Foliar δ15N of the mangroves, which was significantly different from those of the non-mangroves on each island, showed significantly higher values (5‰ to 14‰) in human-affected forests, whereas the values were up to 3‰ in pristine forests. Furthermore, the significant positive relationship between foliar nitrogenous traits and the human-affected area ratios suggested that the anthropogenic N might be regulating foliar N content and δ15N signature on the sites. Conclusion: Different degrees of foliar isotopic fractionation with the land-use gradient have clarified that mangroves can be a powerful tool for monitoring ecosystem conditions under anthropogenic disturbances. View Full-Text
Keywords: foliar nitrogen; foliar C/N ratio; stable nitrogen isotope ratio (ẟ15N); mangroves; non-mangroves; land-use; anthropogenic impacts; ecological indicator foliar nitrogen; foliar C/N ratio; stable nitrogen isotope ratio (ẟ15N); mangroves; non-mangroves; land-use; anthropogenic impacts; ecological indicator
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MDPI and ACS Style

Tanu, F.Z.; Asakura, Y.; Takahashi, S.; Hinokidani, K.; Nakanishi, Y. Variation in Foliar ẟ15N Reflects Anthropogenic Nitrogen Absorption Potential of Mangrove Forests. Forests 2020, 11, 133. https://doi.org/10.3390/f11020133

AMA Style

Tanu FZ, Asakura Y, Takahashi S, Hinokidani K, Nakanishi Y. Variation in Foliar ẟ15N Reflects Anthropogenic Nitrogen Absorption Potential of Mangrove Forests. Forests. 2020; 11(2):133. https://doi.org/10.3390/f11020133

Chicago/Turabian Style

Tanu, Ferdouse Zaman, Yasuhiro Asakura, Satoshi Takahashi, Ko Hinokidani, and Yasuhiro Nakanishi. 2020. "Variation in Foliar ẟ15N Reflects Anthropogenic Nitrogen Absorption Potential of Mangrove Forests" Forests 11, no. 2: 133. https://doi.org/10.3390/f11020133

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