Chronic atmospheric reactive N deposition has breached the N sink capacity of a northern ombrotrophic peatbog increasing the gaseous and fluvial N losses.
Chronic atmospheric reactive N deposition has breached the N sink capacity of a northern ombrotrophic peatbog increasing the gaseous and fluvial N losses.
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慢性大气反应性氮沉积破坏了北部暗营养泥炭沼泽的氮汇能力，增加了气态和河流氮的损失。
DOI：
10.1016/j.scitotenv.2021.147552
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Sgouridis F
中科院分区：
文献类型：
--
作者：
Sgouridis F
泥炭地在调节气候方面发挥着重要作用，主要是通过将二氧化碳封存为泥炭碳，这取决于苔藓的活性氮（Nr）的可用性。在英国的大气氮沉降已经超过了泥炭地苔藓的功能和结构变化的临界负荷，从而威胁到加速其演替维管植物和增加氮出口到下游生态系统的可能性。泥炭地的氮平衡受到的关注相对较少，主要是由于难以测量气态氮损失以及由于生物固氮（BNF）的Nr输入。在这项研究中，我们估计了平均每年的氮平衡的一个ombrotrophic沼泽（Migneint，北威尔士）通过测量原位N2+ N2O气体通量，也在泥炭和苔藓生物固氮。通过连续记录DON通量来监测河流氮输出，而大气氮沉积则在5 x 5 km网格上建模。年平均氮质量平衡略为正值（0.7 ± 4.1 kg N ha−1y−1），年际变化表明该沼泽生态系统已达到氮饱和，易于成为净氮源。气态氮损失是一个主要的氮输出项占70%的氮输入，主要是在惰性N2气体的形式，从而提供部分缓解慢性氮富集的不利影响。与原始沼泽相比，生物固氮被抑制了69%，但仍然活跃，占N输入的2%。长期泥炭氮储存率（8.4 ± 0.8 kg N ha−1y−1）无法通过测量的氮质量平衡来满足，这表明沼泽集水区由于其饱和状态而损失的氮超过了它可以储存的氮。
Peatlands play an important role in modulating the climate, mainly through sequestration of carbon dioxide into peat carbon, which depends on the availability of reactive nitrogen (Nr) to mosses. Atmospheric Nr deposition in the UK has been above the critical load for functional and structural changes to peatland mosses, thus threatening to accelerate their succession by vascular plants and increasing the possibility of Nr export to downstream ecosystems. The N balance of peatlands has received comparatively little attention, mainly due to the difficulty in measuring gaseous N losses as well as the Nr inputs due to biological nitrogen fixation (BNF). In this study we have estimated the mean annual N balance of an ombrotrophic bog (Migneint, North Wales) by measuring in situ N2+ N2O gaseous fluxes and also BNF in peat and mosses. Fluvial N export was monitored through a continuous record of DON flux, while atmospheric N deposition was modelled on a 5 × 5 km grid. The mean annual N mass balance was slightly positive (0.7 ± 4.1 kg N ha−1y−1) and varied interannually indicating the fragile status of this bog ecosystem that has reached N saturation and is prone to becoming a net N source. Gaseous N losses were a major N output term accounting for 70% of the N inputs, mainly in the form of the inert N2gas, thus providing partial mitigation to the adverse effects of chronic Nr enrichment. BNF was suppressed by 69%, compared to rates in pristine bogs, but was still active, contributing ~2% of the N inputs. The long-term peat N storage rate (8.4 ± 0.8 kg N ha−1y−1) cannot be met by the measured N mass balance, showing that the bog catchment is losing more N than it can store due its saturated status.
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影响因子：
11.4
作者：
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通讯作者：
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DOI：
--
发表时间：
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期刊：
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