Nitrous oxide production in riparian zones and its importance to national emission inventories

Peter M Groffman , Arthur J Gold , Kelly Addy
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引用次数: 183

Abstract

Riparian zones, which sit at the interface between terrestrial and aquatic components of the landscape, often receive and process large amounts of excess nitrogen (N) that moves out of agricultural fields towards streams. These areas thus have the potential to be “hotspots” of nitrous oxide (N2O) production in the landscape. However, current Intergovernmental Program on Climate Change (IPCC) methodologies for calculating national N2O emission inventories do not explicitly account for riparian N2O production. In this paper, we examine the nature and extent of N2O production in riparian zones, present some new data on N2O production in these areas, and propose a modification to the current IPCC methodology for quantifying N2O emissions from agriculture. We also present an example of how large-scale riparian restoration efforts to achieve agricultural water quality objectives could cause significant changes in regional N2O budgets. Although current data are inadequate to propose a quantitative emission factor for riparian N2O emissions, they suggest that these emissions are likely to be significant in many regions. Specific data on riparian N2O emissions should be collected in association with detailed watershed mass balance studies that allow for evaluation of several aspects of the IPCC methodology at once and provide constraints on the magnitude of fluxes that are difficult to measure, e.g. N2O flux, N2O:N2 ratio. Riparian and wetland restoration projects to reduce NO3 delivery to coastal waters are being considered in many areas of the world. These projects may affect regional and global N2O budgets, but only if they alter the N2O:N2 ratio during denitrification.

河岸地带氧化亚氮的产生及其对国家排放清单的重要性
河岸区位于陆地和水生景观之间的界面,经常接收和处理大量从农田流向溪流的过量氮(N)。因此,这些地区有可能成为景观中一氧化二氮(N2O)生产的“热点”。然而,目前政府间气候变化项目(IPCC)计算国家一氧化二氮排放清单的方法并没有明确考虑到河岸一氧化二氮的产生。在本文中,我们研究了河岸带N2O生产的性质和程度,提出了这些地区N2O生产的一些新数据,并提出了对目前IPCC量化农业N2O排放方法的修改。我们还提供了一个例子,说明为实现农业水质目标而进行的大规模河岸恢复工作如何导致区域N2O预算发生重大变化。虽然目前的数据不足以提出河岸N2O排放的定量排放因子,但它们表明,这些排放在许多地区可能是显著的。关于河岸N2O排放的具体数据应与详细的流域质量平衡研究结合起来收集,以便一次评估IPCC方法的几个方面,并对难以测量的通量大小(例如N2O通量、N2O:N2比率)提供限制。世界上许多地区正在考虑实施河岸和湿地恢复项目,以减少向沿海水域输送NO3−。这些项目可能会影响区域和全球的N2O预算,但前提是它们改变了反硝化过程中的N2O:N2比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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