石生苔藓氮含量和氮同位素指示贵阳地区大气氮沉降的空间变化和来源

被引:14
作者
刘学炎 [1 ]
肖化云 [1 ]
刘丛强 [1 ]
李友谊 [1 ]
李琳 [2 ]
机构
[1] 中国科学院地球化学研究所环境地球化学国家重点实验室
[2] 河北师范大学生命科学学院
关键词
大气氮沉降; 苔藓; 氮同位素; 氨; 来源;
D O I
10.13227/j.hjkx.2008.07.008
中图分类号
X51 [大气污染及其防治]; X173 [环境植物学];
学科分类号
0706 ; 070602 ; 071012 ; 0713 ;
摘要
对贵阳市区到农村地区4个方向的石生苔藓氮含量和氮同位素组成进行了对比分析.苔藓氮含量变化范围为0.85%2.97%,并从市区(2.24%±0.32%)往外明显降低(1.27%±0.13%),表明贵阳市区氮沉降最高、往外逐渐降低,但在较远的农村地区(>25 km)苔藓氮含量出现回升(平均1.33%1.75%),反映了农村地区大气氮输入有所增加.苔藓氮同位素均为负值(-12.50‰-1.39‰),并从市区到农村地区明显升高.市区苔藓较负的氮同位素比值(平均-8.87‰-8.59‰)主要指示了城市排泄物和污水所释放的氨源贡献,而郊区和农村地区苔藓较高的氮同位素信号(平均-3.83‰-2.48‰)主要反映了农业氨源的影响,苔藓氮含量回升可能与农业活动增强有关.此外,贵阳地区苔藓氮同位素的分布特征与受氧化态氮源控制的地区苔藓氮同位素变化相反,因而,贵阳地区大气氮沉降以铵(NHx)沉降为主,该结论有助于更加准确地认识城市地区大气氮沉降的来源和变化.
引用
收藏
页码:1785 / 1790
页数:6
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