利用樟树叶片氮含量和同位素组成初探武汉市大气氮沉降和氮源  

Reconstruction of Atmospheric Nitrogen Deposition and Nitrogen Source in Wuhan by the Nitrogen Contents and Isotopic Composition of Camphor Leaves

作　　者：朱园园 孙庭玉[2] 邢腾 杜勇 邱海鸥[3] 宋虎跃[2] Zhu Yuanyuan;Sun Tingyu;Xing Teng;Du Yong;Qiu Haiou;Song Huyue(Hubei Key Laboratory of Paleontology and Geological Environment Evolution,Wuhan Center of China Geological Survey,Wuhan 430223,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430078,China;Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430078,China)

机构地区：[1]中国地质调查局武汉地质调查中心古生物与地质环境演化湖北省重点实验室,湖北武汉430223 [2]中国地质大学生物地质与环境地质国家重点实验室,湖北武汉430078 [3]中国地质大学材料与化学学院,湖北武汉430078

出　　处：《地球科学》2022年第3期1136-1142,共7页Earth Science

基　　金：古生物与地质环境演化湖北省重点实验室开放基金项目(No.2020-03);国家自然科学基金项目(Nos.41872033,42172032)。

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(NO_(x))、工厂排放的氨氮化合物(NH_(y))的δ^(15)N值.市郊大学校园的樟树叶片δ^(15)N值与土壤较为一致,市区大学校园的δ^(15)N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.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(NO_(x)) emitted by automobile exhaust and the ammonia nitrogen compounds(NH_(y)) emitted by factory respectively. The δ^(15)N values of the camphor leaves on suburban university campus are consistent with the values of the soil. The δ^(15)N 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.

关 键 词：氮沉降 氮源 樟树叶片 氮含量 氮同位素 武汉市 地球化学 

分 类 号：P595[天文地球—地球化学]