沼泽
泥炭
生物地球化学循环
垃圾箱
营养物
植物凋落物
氮气
环境化学
沉积(地质)
碳汇
生态系统
化学
环境科学
植物
生态学
生物
沉积物
古生物学
有机化学
作者
Luca Bragazza,Alexandre Buttler,Jonathan Habermacher,Lisa Brancaleoni,Renato Gerdol,Hannu Fritze,Peter Hanajík,Raija Laiho,David Johnson
标识
DOI:10.1111/j.1365-2486.2011.02585.x
摘要
Abstract Bogs are globally important sinks of atmospheric carbon ( C ) due to the accumulation of partially decomposed litter that forms peat. Because bogs receive their nutrients from the atmosphere, the world‐wide increase of nitrogen ( N ) deposition is expected to affect litter decomposition and, ultimately, the rate of C accumulation. However, the mechanism of such biogeochemical alteration remains unclear and quantification of the effect of N addition on litter accumulation has yet to be done. Here, we show that 7 years of N addition to a bog decreased the C : N ratio, increased the bacterial biomass and stimulated the activity of hydrolytic and oxidative enzymes in surface peat. Furthermore, N addition modified nutrient limitation of microbes during litter decomposition so that phosphorus became a primary limiting nutrient. Alteration of N release from decomposing litter affected bog water chemistry and the competitive balance between peat‐forming mosses and vascular plants. We estimate that deposition of about 4 g N m −2 yr −1 will cause a mean annual reduction of fresh litter C accumulation of about 40 g m −2 primarily as a consequence of decreased litter production from peat‐forming mosses. Our findings show that N deposition interacts with both above and below ground components of biodiversity to threaten the ability of bogs to act as N ‐sinks, which may offset the positive effects of N on C accumulation seen in other ecosystems.
科研通智能强力驱动
Strongly Powered by AbleSci AI