自然植被作为大气氨的源或汇：案例研究。

Natural vegetation as a source or sink for atmospheric ammonia: a case study.

出版信息

Science. 1992 Jan 31;255(5044):581-3. doi: 10.1126/science.255.5044.581.

DOI:10.1126/science.255.5044.581

Abstract

Measurements of gaseous ammonia above a montane-subalpine forest in the Colorado mountains show that the role of the forest as a source or sink depends on the atmospheric concentrations. The canopy appeared to be an ammonia source when exposed to air containing low concentrations, but a sink when exposed to air enriched by nearby agricultural sources. The forest-averaged compensation point was 0.8 part per billion by volume at 20 degrees C. The net burden of ammonia and other nitrogen species of anthropogenic origin at this site was much less than at forest sites in the eastern United States and Europe and may provide a valuable resource for this nitrogen-limited ecosystem.

摘要

对科罗拉多山脉的山地-亚高山森林上方的气态氨进行测量表明，森林作为源或汇的作用取决于大气浓度。当树冠暴露在含有低浓度空气时，它似乎是氨的源，但当暴露在附近农业源富化的空气中时，它则是一个汇。在 20°C 时，森林的平均补偿点为体积 0.8 十亿分率。与美国东部和欧洲的森林地区相比，该地区人为来源的氨和其他氮物种的净负担要小得多，这可能为这个氮限制的生态系统提供了宝贵的资源。