NATURAL VEGETATION AS A SOURCE OR SINK FOR ATMOSPHERIC AMMONIA - A CASE-STUDY

被引：123

作者：

LANGFORD, AO ^{[1
]}

FEHSENFELD, FC ^{[1
]}

机构：

[1] NOAA,ENVIRONM RES LABS,AERON LAB,BOULDER,CO 80303

来源：

SCIENCE | 1992年 / 255卷 / 5044期

关键词：

D O I：

10.1126/science.255.5044.581

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：581 / 583

页数：3

共 31 条

[1] DRY DEPOSITION OF AMMONIA AT ENVIRONMENTAL CONCENTRATIONS ON SELECTED PLANT-SPECIES [J].