将美国玉米非生长季节的一氧化二氮排放量计算在内,每年可使二氧化碳净排放量增加 31

IF 2.3 4区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY
Brian Buma
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引用次数: 0

摘要

一氧化二氮(N2O)是一种重要的温室气体,也是目前最重要的臭氧消耗物质,主要通过农业施肥排放。目前全国范围内的一氧化二氮排放估算方法主要是通过排放因子进行估算。估算全国范围排放的模型侧重于生长季节的排放。然而,有相当一部分一氧化二氮可能是在非生长季节排放的。本研究利用最新发布的非生长季节一氧化二氮排放比率图和高分辨率氮肥施用数据,探讨了如果仅使用默认的以生长季节为重点的方法,被低估的一氧化二氮排放量的潜在规模。尽管在县级范围内存在较大差异(12%-35%),但全国非生长季的排放量估计占总量的 31%,即每年可能排放 12,000 千兆克 CO2e。进一步的工作应更好地完善空间排放估算,并充分整合生长季节和非生长季节的估算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Including non-growing season emissions of N2O in US maize could raise net CO2e emissions by 31% annually

Including non-growing season emissions of N2O in US maize could raise net CO2e emissions by 31% annually

Nitrous oxide (N2O) is a significant greenhouse gas and the most important currently emitted ozone depleting substance, primarily via agricultural fertilization. Current N2O emission estimation methods at the national scale are predominantly via emission factors. Models estimating national-scale emissions are focused on growing season emissions. However, a substantial fraction of N2O can be emitted during non-growing season periods. Using newly published off-season N2O emission ratio maps and high-resolution nitrogen application data, this study explores the potential magnitude of underestimated N2O emissions if using only the default growing-season focused methodology. Although there is large variation at county scales (12%–35%), non-growing season national emissions are estimated at 31% of the total, a potential 12,000 Gg CO2e year−1. Further work should better refine emission estimates spatially as well as fully integrate estimates across growing and non-growing seasons.

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来源期刊
CiteScore
3.70
自引率
3.80%
发文量
28
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