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.
Publication name |
ENVIRONMENTAL POLLUTION Volume: 162 Pages: 48-55 Published: MAR 2012 |
Author(s) |
Liu, Xue-Yan; Koba, Keisuke; Takebayashi, Yu; Liu, Cong-Qiang; Fang, Yun-Ting; Yoh, Muneoki
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Corresponding author |
Koba, Keisuke
keikoba@cc.tuat.ac.jp
Tokyo Univ Agr & Technol, Grad Sch Agr, Fuchu, Tokyo 1838509, Japan
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Author(s) from IGCAS |
LIU Xueyan, LIU Congqiang |
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