Reconstruction of Atmospheric Nitrogen Deposition and Nitrogen Source in Wuhan by the Nitrogen Contents and Isotopic Composition of Camphor Leaves
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摘要:
为了解武汉市不同城市功能区大气氮沉降的具体特征，对城市交通区、工业区、文教区和市郊交通区、文教区5个功能区的樟树叶片及根际土壤的氮含量和氮同位素组成进行测定，发现城市公路、工厂附近和大学校园的樟树叶片的氮含量明显高于市郊大学校园和公路.城市公路、工厂附近的樟树叶片的氮同位素分别受控于汽车尾气排放的氮氧化物（NOx）、工厂排放的氨氮化合物（NHy）的δ15N值.市郊大学校园的樟树叶片δ15N值与土壤较为一致，市区大学校园的δ15N值明显偏负，可能受到附近城中村农业氨排放的影响.樟树叶片的氮含量和同位素组成是揭示武汉市大气氮沉降特征的有效途径之一.
Abstract:In order to understand the specific characteristics of atmospheric nitrogen deposition in different functional areas of Wuhan, the nitrogen contents and nitrogen isotope composition of camphor leaves and rhizosphere soil in five functional areas including urban traffic area, industrial area, educational area, suburban traffic area and educational area were analyzed. The nitrogen contents of camphor leaves near the urban road, factory and university campus were significantly higher than those of suburban university campus and road. Nitrogen isotopes of camphor leaves near urban road and factory are controlled by the nitrogen isotope composition of the nitrogen oxides (NOx) emitted by automobile exhaust and the ammonia nitrogen compounds (NHy) emitted by factory respectively. The δ15N values of the camphor leaves on suburban university campus are consistent with the values of the soil. The δ15N values of the urban university campus are negative, which may be affected by agricultural ammonia emission from nearby urban villages. The nitrogen contents and isotopic composition of camphor leaves are one of the effective ways to reveal the characteristics of atmospheric nitrogen deposition in Wuhan.
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Key words:
- nitrogen deposition /
- nitrogen source /
- camphor leaves /
- nitrogen content /
- nitrogen isotope /
- Wuhan /
- geochemistry
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图 1 采样位置
①为中国地质大学（武汉）南望山校园；②为武昌江滩附近城市公路；③为武汉钢铁厂附近；④为市郊中国地质大学（武汉）未来城校园；⑤为藏龙岛国家湿地公园公路附近
Fig. 1. Sampling locations
图 2 不同功能区樟树叶片氮含量
1. 南望山校园；2. 城市公路；3. 工厂附近；4. 未来城校园；5. 市郊公路
Fig. 2. Nitrogen contents of camphor leaves in different functional areas
图 3 樟树叶片氮含量与氮同位素相关关系
Fig. 3. Relationship between nitrogen contents and nitrogen isotopes of the camphor leaves
表 1 武汉市不同地区樟树叶片和根际土壤的δ15N值（氮同位素组成均为相对空气的值）
Table 1. Nitrogen isotopic composition of camphor leaves and rhizosphere soil in different areas of Wuhan (δ15N vs air, ‰)
采样地点 样品1 样品2 样品3 样品4 平均值 南望山校园 ‒6.4 ‒8.1 ‒7.7 ‒6.4 ‒7.1±0.9 城市公路 1.5 0.5 ‒0.5 1.7 0.8±1.0 工厂附近 ‒3.6 ‒3.0 ‒1.9 1.2 ‒1.8±2.1 未来城校园 ‒2.2 0.9 ‒0.4 1.0 ‒0.2±1.5 市郊公路 ‒1.7 ‒2.3 0.4 1.2 ‒0.6±1.6 南望山校园土壤 ‒0.4 ‒2.6 ‒1.5±1.6 城市公路土壤 6.7 9.6 8.2±2.1 工厂附近土壤 7.5 5.4 6.5±1.5 未来城校园土壤 1.3 ‒0.6 0.3±1.3 市郊公路土壤 7.6 9.2 8.4±1.2 
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