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Pitfalls and New Mechanisms in Moss Isotope Biomonitoring of Atmospheric Nitrogen Deposition

dankan 添加于 2012/12/11 14:04:06  771次阅读 | 1次推荐 | 1个评论

Moss N isotope (δ15Nbulk) has been used to monitor N deposition, but it remains questionable whether inhibition of nitrate reductase activity (NRA) by reduced dissolved N (RDN) engenders overestimation of RDN in deposition when using moss δ15Nbulk. We tested this question by investigation of δ15Nbulk and δ15NO3– in mosses under the dominance of RDN in N depositions of Guiyang, SW China. The δ15Nbulk of mosses on bare rock (?7.9‰) was unable to integrate total dissolved N (TDN) (δ15N = ?6.3‰), but it reflected δ15N-RDN (?7.5‰) exactly. Moreover, δ15N-NO3– in mosses (?1.7‰) resembled that of wet deposition (?1.9‰). These isotopic approximations, together with low isotopic enrichment with moss [NO3–] variations, suggest the inhibition of moss NRA by RDN. Moreover, isotopic mixing modeling indicated a negligible contribution from NO3– to moss δ15Nbulk when the RDN/NO3– reaches 3.8, at which maximum overestimation (21%) of RDN in N deposition can be generated using moss δ15Nbulk as δ15N-TDN. Moss δ15N-NO3– can...

作 者:Xue-Yan Liu †‡, Keisuke Koba *‡, Cong-Qiang Liu †, Xiao-Dong Li †, and Muneoki Yoh ‡
期刊名称: Environmental Science and Technology
期卷页: 第卷 第期 ~页
学科领域:化学科学 » 环境化学 » 环境分析化学
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原文链接:http://pubs.acs.org/doi/abs/10.1021/es300779h
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发表评论人:liuxueyan [2012/12/14 16:20:53] 
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