Quantifying annual N2O emission fluxes from grazed grassland under a range of inorganic fertiliser nitrogen inputs
Quantifying annual N2O emission fluxes from grazed grassland under a range of inorganic fertiliser nitrogen inputs
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DOI：
10.1016/j.agee.2009.12.006
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发表时间：
2010-03-15
影响因子：
6.6
通讯作者：
Scholefield, D.
中科院分区：
文献类型：
--
作者：
Cardenas, L. M.;Thorman, R.;Scholefield, D.
本研究的目的是测量施肥放牧草地的 N2O 排放量，为有限的现有放牧草地 N2O 通量数据添加有价值的信息，并帮助开发针对英国土壤直接排放的新的国家特定 EF。这是通过评估在氮输入0-350 kg ha(-1) 范围内施用于放牧草地土壤的无机肥料氮对N2O 排放的影响来完成的。在两年的时间里，在英格兰和威尔士的 3 个地点使用封闭的静态室测量了一氧化二氮通量。计算累积通量并根据施用的无机肥料 N 回归总排放量，以估算土壤中 N2O 排放的排放因子。数据显示，英国放牧草地土壤施用无机肥的N2O排放因子与IPCC默认值1.25%不同。观察到 N2O 排放量对肥料施氮量的非线性响应。 N2O 的年排放量是根据适合测量数据的模型函数估算的，扣除背景通量后，英国三个地点（一个位于英国东部，另外两个位于英国西部）施用 100 kg N 时，排放量分别为 0.5 和 3.9 kg N2O-N ha(-1) yr(-1)（合并两个地点的数据后）。 (C) 2009 Elsevier B.V. 保留所有权利。
The objective of the present study was to measure emissions of N2O from fertilized grazed grassland that can be used to add valuable information to the limited existing data on N2O fluxes from grazed grassland and aid the development of new country-specific EFs for direct emissions from soils in the UK. This was done by evaluating the effect on N2O emissions of inorganic fertiliser N applied to grazed grassland soils over the range of N inputs 0-350 kg ha(-1). Nitrous oxide fluxes were measured using closed static chambers at 3 sites in England and Wales over a two-year period. Cumulative fluxes were calculated and the total emission regressed against applied inorganic fertiliser N in order to estimate the emission factor for N2O emissions from soils. The data showed that, the emission factor for N2O from inorganic fertiliser applied to grazed grassland soils in the UK differs from the IPCC default value of 1.25%. A nonlinear response of N2O emissions to fertiliser N application rates was observed. Annual emissions of N2O were estimated from a modelled function fitted to the measured data and after subtraction of the background flux resulted in emissions of 0.5 and 3.9 kg N2O-N ha(-1) yr(-1) for an application of 100 kg N for three locations in the UK, one in the East and the other two in the West of the UK (after combining the data from two sites), respectively. (C) 2009 Elsevier B.V. All rights reserved.