High nitrogen deposition alters the decomposition of bog plant litter and reduces carbon accumulation

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
出处
期刊:Global Change Biology [Wiley]
卷期号:18 (3): 1163-1172 被引量:123
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.
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