Journal
ENVIRONMENTAL POLLUTION
Volume 162, Issue -, Pages 48-55Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2011.09.029
Keywords
Denitrifier method; Atmospheric nitrate; Nitrogen and oxygen isotopes; Soil; Moss
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Funding
- Sumitomo Foundation
- Program for Next Generation World-Leading Researchers (NEXT) [GS008]
- Ministry of Education, Culture, Sports, Science and Technology, Japan
- National Natural Science Foundation of China [40903012, 40721002]
- JSPS [09F09316]
- [187801172]
- [19310019]
- [20780113]
- Grants-in-Aid for Scientific Research [09F09316] Funding Source: KAKEN
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Natural mosses have been employed as reactive and accumulative indicators of atmospheric pollutants. Using the denitrifier method, the concentration, delta N-15 and delta O-18 of moss nitrate (NO3-) were measured to elucidate the sources of NO3- trapped in natural mosses. Oven drying at 55-70 degrees C, not lyophilization, was recommended to dry mosses for NO3- analyses. An investigation from urban to mountain sites in western Tokyo suggested that moss (NO3-] can respond to NO3- availability in different habitats. NO3- in terricolous mosses showed isotopic ratios as close to those of soil NO3-, reflecting the utilization of soil NO3-. Isotopic signatures of NO3- in corticolous and epilithic mosses elucidated atmospheric NO3- sources and strength from the urban (vehicle NOx emission) to mountain area (wet-deposition NO3-). However, mechanisms and isotopic effects of moss NO3- utilization must be further verified to enable the application of moss NO3- isotopes for source identification. (C) 2011 Elsevier Ltd. All rights reserved.
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