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Nitrogen concentrations and nitrogen isotopic compositions in leaves of Cinnamomum Camphora and Pinus massoniana (Lamb.) for indicating atmospheric nitrogen deposition in Guiyang (SW China)
Yu Xu;  Huayun Xiao;  Linglu Qu
2017
Source PublicationAtmospheric Environment
Volume159Pages:1-10
Abstract

Nitrogen (N) concentrations and delta N-15 signatures in soil and camphor (Cinnamomum Camphora) and Masson pine (Pinus massoniana Lamb.) leaves collected along an urban-rural gradient in Guiyang (SW China) were investigated systematically. N concentrations in camphor (1.01-2.37%) and Masson pine (0.99-2.42%) leaves showed a significant decrease from central Guiyang (0-6 km) to suburban areas (18 -24 km), while slightly increased leaf N concentrations reemerged at areas more than 24 km from the city center. The delta N-15 values in camphor and Masson pine leaves also decreased from central Guiyang to the rural area, with more positive leaf delta N-15 in the urban area and N-15-depleted leaf delta N-15 in the rural area. No significant differences were observed for soil N concentrations and soil delta N-15 in these areas, which suggested that the decrease in leaf N concentrations was due to decreased atmospheric N deposition along the urban-rural gradient and that there were two isotopically different atmospheric N sources in Guiyang city: foliar delta N-15 values in urban areas were mainly influenced by N-15-enriched atmospheric NOx-N from traffic emissions, while those in rural areas were primarily affected by N-15-depleted atmospheric NHX-N from agricultural activities. However, the pattern of moss (collected ten years prior, with lower traffic density and wastewater treatment rate in the urban area) delta N-15 variation in the urban area (0 -12 km) was contrary to that of the camphor and Masson pine leaves, indicating that the delta N-15 values in previously collected urban mosses were mainly controlled by isotopically light NHx-N from untreated wastes and sewage, but were much less affected by traffic. For the trees in the urban area, N concentrations in camphor and Masson pine leaves varied in parallel with their delta N-15 values (P < 0.0001), and we thus applied a mass balance equation to estimate the delta N-15 value (about 7 parts per thousand) in the atmospheric N deposition in the urban area. This indicated that the greater delta N-15 in urban camphor and Masson pine leaves reflected a higher contribution of NOx-N to N deposition. This study shows that the analysis of N and delta N-15 in camphor and Masson pine leaves is a promising method to indicate N deposition. (C) 2017 Elsevier Ltd. All rights reserved

KeywordLeaf Moss Soil Delta N-15 n Deposition
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/7761
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, No. 99, Lincheng West Road, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
First Author Affilication中国科学院地球化学研究所
Corresponding Author Affilication中国科学院地球化学研究所
Recommended Citation
GB/T 7714
Yu Xu;Huayun Xiao;Linglu Qu. Nitrogen concentrations and nitrogen isotopic compositions in leaves of Cinnamomum Camphora and Pinus massoniana (Lamb.) for indicating atmospheric nitrogen deposition in Guiyang (SW China)[J]. Atmospheric Environment,2017,159:1-10.
APA Yu Xu;Huayun Xiao;Linglu Qu.(2017).Nitrogen concentrations and nitrogen isotopic compositions in leaves of Cinnamomum Camphora and Pinus massoniana (Lamb.) for indicating atmospheric nitrogen deposition in Guiyang (SW China).Atmospheric Environment,159,1-10.
MLA Yu Xu;Huayun Xiao;Linglu Qu."Nitrogen concentrations and nitrogen isotopic compositions in leaves of Cinnamomum Camphora and Pinus massoniana (Lamb.) for indicating atmospheric nitrogen deposition in Guiyang (SW China)".Atmospheric Environment 159(2017):1-10.
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