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Estimates of dry and wet deposition using tissue N contents and 15N natural abundance in epilithic mosses in atmospheric NHy‐dominated areas
Hua‐Yun Xiao; Cong‐Qiang Liu
2011
Source PublicationJournal of Geophysical Research
Volume116Issue:D3
Other AbstractMeasurement of dry N deposition by physical methods is time‐consuming because it is usually difficult to measure directly. In this study, an alternative approach has successfully been proposed by coupling isotopic ratios with tissue N contents of epilithic mosses. The method is to use moss N contents to quantitatively estimate total N (TN) deposition and then to use 15N natural abundance in mosses to discriminate dry and wet deposition in atmospheric NHy‐dominated areas (NHy /TN > 0.75). On the basis of the isotopic balance between atmospheric NHy and moss tissue N and the correlation between atmospheric NHy concentrations and their isotopes, both wet and dry N deposition can be estimated. By the approach, we have estimated rainwater ammonium concentrations and contribution percentage of wet deposition to total N deposition ( fwet) in some areas of southern China. The results indicated that rainwater ammonium concentrations increased relative to those reported previously in most cities, owing to stronger anthropogenic activity. The fwet values estimated in most sites were found to be slightly higher than those reported, because faster transformation rates due to higher SO2 emission later in acid rain areas of southern China favored deposition in the form of wet deposition instead of dry deposition. The largest uncertainty of the approach comes from the influence of NOx in the atmosphere, and thus it cannot be used in areas where NOx deposition is high. The presented isotopic approach represents a new application of moss biomonitoring for estimating atmospheric N deposition in NHy‐dominated areas.
Subject Area环境地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/7012
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Hua‐Yun Xiao,Cong‐Qiang Liu. Estimates of dry and wet deposition using tissue N contents and 15N natural abundance in epilithic mosses in atmospheric NHy‐dominated areas[J]. Journal of Geophysical Research,2011,116(D3).
APA Hua‐Yun Xiao,&Cong‐Qiang Liu.(2011).Estimates of dry and wet deposition using tissue N contents and 15N natural abundance in epilithic mosses in atmospheric NHy‐dominated areas.Journal of Geophysical Research,116(D3).
MLA Hua‐Yun Xiao,et al."Estimates of dry and wet deposition using tissue N contents and 15N natural abundance in epilithic mosses in atmospheric NHy‐dominated areas".Journal of Geophysical Research 116.D3(2011).
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