Modelling spatial and inter-annual variations of nitrous oxide emissions from UK cropland and grasslands using DailyDayCent

Modelling spatial and inter-annual variations of nitrous oxide emissions from UK cropland and grasslands using DailyDayCent
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使用 DailyDayCent 对英国农田和草原一氧化二氮排放量的空间和年际变化进行建模

DOI:
10.1016/j.agee.2017.08.032
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发表时间:
2017
期刊:
Agriculture, Ecosystems & Environment
影响因子:
--
通讯作者:
Fitton N
Fitton N
中科院分区:
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文献类型:
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作者:
Fitton N

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农业土壤是一氧化二氮排放的主要来源,这是由于包括施肥在内的管理做法造成的。虽然施肥量是一氧化二氮排放的主要驱动因素之一,但排放量还取决于气候和土壤特性等其他变量。为了了解排放率的空间和年际变化,对2000年至2010年英国草地和农田的N2 O排放进行了模拟。此外,还测试了这些排放对土壤和气候输入的敏感性。在英国的农田和草地上,模拟的排放量分别为0.3 - 3.5 kg N ha− 1 yr − 1和0.7-7 kg N ha− 1 yr − 1。虽然年际变化可归因于气候影响,但排放量空间变化的主要驱动因素是土壤粘土含量。然而,当单独测试一氧化二氮排放量对土壤粘土含量的敏感性时,当土壤质地改变超出用作不同数据库模型输入的正常范围时,它并不总是排放量的最佳预测因子。
Agricultural soils are the primary source of nitrous oxide emissions due to management practices including fertiliser application. While fertiliser rates are one of the main drivers of nitrous oxide emissions, emissions are also dependent on other variables such as climate and soil properties. To understand the spatial and inter-annual variations in emission rate, simulations of N2O emissions were made from 2000 to 2010 for UK grass and croplands. In addition, the sensitivity of these emissions to soil and climate inputs was also tested. Emissions of between 0.3 to 3.5 kg N ha−1yr−1and 0.7–7 kg N ha−1yr−1were simulated across UK croplands and grasslands, respectively. While inter-annual variations can be attributed to climate influences, the primary driver of spatial variations in emissions was soil clay content. However, when the sensitivity of nitrous oxide emissions to soil clay content alone was tested, it was not always the best predictor of emissions, when soil texture is altered outside of the normal range used as inputs to the model from different databases.
通过模型数据融合约束各种土地利用的 CO 2 和 N 2 O 排放模拟的复杂生物地球化学模型
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