...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Applied Geochemistry: Journal of the International Association of Geochemistry and Cosmochemistry >Tissue N content and N-15 natural abundance in epilithic mosses for indicating atmospheric N deposition in the Guiyang area, SW China
【24h】

Tissue N content and N-15 natural abundance in epilithic mosses for indicating atmospheric N deposition in the Guiyang area, SW China

机译：贵阳地区表层藓类植物中的组织N含量和N-15自然丰度，表明大气中的N沉积

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Tissue N contents and delta N-15 signatures in 175 epilithic mosses were investigated from urban to rural sites in Guiyang (SW China) to determine atmospheric N deposition. Moss N contents (0.85-2.97%) showed a significant decrease from the urban area (mean = 2.24 +/- 0.32%, 0-5 km) to the rural area (mean = 1.27 +/- 0.13%, 20-25 km), indicating that the level of N deposition decreased away from the urban environment, while slightly higher N contents re-occurred at sites beyond 30 km, suggesting higher N deposition in more remote rural areas. MOSS delta N-15 ranged from -12.50 parts per thousand to -1.3 parts per thousand and showed a clear bimodal distribution (-12 parts per thousand to -6 parts per thousand and -5 parts per thousand to -2 parts per thousand), suggesting that there are two main sources for N deposition in the Guiyang area. More negative delta N-15 (mean = -8.87 +/- 1.65 parts per thousand) of urban mosses mainly indicated NH3 released from excretory wastes and sewage, while the less negative delta N-15 (from -3.83 +/- 0.82 parts per thousand to -2.48 +/- 0.95 parts per thousand) of rural mosses were mainly influenced by agricultural NH3. With more negative values in the urban area than in the rural area, the pattern of moss delta N-15 variation in Guiyang was found to be opposite to cities where N deposition is dominated by NOx-N. Therefore, NHx-N is the dominant N form deposited in the Guiyang area, which is supported by higher NHx-N than NOx-N in local atmospheric deposition. From the data showing that moss is responding to NHx-N/NOx-N in deposition it can be further demonstrated that the variation of moss delta N-15 from the Guiyang urban to rural area was more likely controlled by the ratio of urban-NHx/agriculture-NHx than the ratio of NHx-N/NOx-N. The results of this study have extended knowledge of atmospheric N sources in city areas, showing that urban sewage discharge could be important in cities co-generic to Guiyang. (c) 2008 Elsevier Ltd. All rights reserved.
机译：在贵阳（中国西南）从城市到农村，对175种上石藓类植物的组织N含量和δN-15特征进行了调查，以确定大气中的N沉积。从市区（平均= 2.24 +/- 0.32％，0-5 km）到农村地区（平均= 1.27 +/- 0.13％，20-25 km），苔藓N含量（0.85-2.97％）显着下降。 ），表明远离城市环境的N沉积水平下降，而30 km以上的地点再次出现较高的N含量，这表明偏远农村地区的N沉积较高。 MOSS delta N-15的范围从千分之-12.50到千分之-1.3，并显示出清晰的双峰分布（千分之十二至千分之六至千分之五至千分之二至千分之二），这表明贵阳地区有两个主要的氮沉积源。负苔藓N-15较多（平均值= -8.87 +/- 1.65千分之一）主要表示排泄废物和污水中释放的NH3，而负苔藓N-15较少（每公斤-3.83 +/- 0.82份）一千至-2.48 +/- 0.95千份的农村青苔主要受到农业NH3的影响。市区的负值比农村的负值更多，因此贵阳市的苔藓三角洲N-15变化模式与氮沉降以NOx-N为主的城市相反。因此，NHx-N是在贵阳地区沉积的主要N形态，在局部大气沉积中，NHx-N比NOx-N高。根据显示苔藓对沉积物中NHx-N / NOx-N响应的数据，可以进一步证明，从贵阳市区到农村地区，moss delta N-15的变化更可能由市区-NHx的比例控制。 / agriculture-NHx比NHx-N / NOx-N的比率。这项研究的结果扩展了城市地区大气氮源的知识，表明城市污水排放在贵阳市共生城市中可能很重要。 （c）2008 Elsevier Ltd.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号