期刊
ECOSYSTEMS
卷 13, 期 3, 页码 367-381出版社
SPRINGER
DOI: 10.1007/s10021-010-9324-7
关键词
artificial rainfall; leaching; (15)N pool dilution; canopy retention; throughfall
类别
资金
- University of Vienna
- Provincial government of Lower Austria
Little is known about how tropical forest canopies interact with atmospheric nitrogen deposition and how this affects the internal nutrient dynamics and the processing of external nutrient inputs. The objectives of this study therefore were (1) to investigate gross and net canopy nitrogen (N) fluxes (retention and leaching) and (2) the effect of canopy components on net canopy N retention. Tracers were applied on detached branches in a tropical wet lowland rainforest, Costa Rica. A novel (15)N pool dilution method showed that gross canopy fluxes (retention and leaching) of NO(3) (-), NH(4) (+), and dissolved organic nitrogen (DON) were remarkably higher than net throughfall fluxes. Gross fluxes of NH(4) (+) and NO(3) (-) resulted in a negligible net flux whereas DON showed net uptake by the canopy. The highest quantity of (15)N was recovered in epiphytic bryophytes (16.4%) although the largest biomass fraction was made up of leaves. The study demonstrates that tracer applications allow investigation of the dynamic and complex canopy exchange processes and that epiphytic communities play a major role in solute fluxes in tree canopies and therefore in the nutrient dynamics of tropical rain forests.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据