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Methane emissions from southern High Plains dairy wastewater lagoons in the summer

机译：夏季南部高平原乳业废水池的甲烷排放量

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Methane is a greenhouse gas with a global warming potential 25-fold that of CO2, and animal agriculture is recognized as a source of CH4 to the atmosphere. Dairy farms on the southern High Plains of New Mexico and Texas (USA) are typically open lot, and sources of CH4 are enteric emissions from cattle and wastewater lagoons. Uncovered anaerobic lagoons are identified by the US Environmental Protection Agency as a source of CH4 in dairy manure management systems. Our objective was to quantify summer CH4 emissions from wastewater lagoons of a commercial dairy farm in eastern New Mexico. Research was conducted during 8 days in August (2009) at a 3500 cow open lot dairy farm with flush alleys. Methane concentration over three lagoons (total area of 1.8 ha) was measured using open path laser spectroscopy. Background CH4 concentration was measured using a back-flush gas chromatography system with flame ionization. Wind and turbulence data were measured using a three-axis sonic anemometer. Emissions were estimated using an inverse dispersion model. Methane concentrations in the air over the lagoons ranged from 3 to 12 ppm, and averaged 5.6 ppm, with a background CH4 concentration of 1.83 ppm. Methane flux density (i.e., emission rate/unit area) ranged from 165 to 1184 mu g/m(2)/s, with a mean daily CH4 flux density of 402 kg/ha/d. Methane emission rate averaged 0.211 kg/head/d. Uncovered anaerobic lagoons were a source of CH4 emitted from this southern High Plains dairy farm, and lagoons could be a control point for emission reductions.This article is part of the special issue entitled: Greenhouse Gases in Animal Agriculture Finding a Balance between Food and Emissions, Guest Edited by TA. McAllister, Section Guest Editors: K.A. Beauchemin, X. Hatt S. McGinn and Editor for Animal Feed Science and Technology. P.H. Robinson. Published by Elsevier B.V.
机译：甲烷是一种温室气体，全球变暖潜力是二氧化碳的25倍，而畜牧业被认为是大气中CH4的来源。新墨西哥州南部高地和德克萨斯州（美国）的奶牛场通常是露天的，CH4的来源是牛和污水池的肠道排放。美国环境保护署将未发现的厌氧泻湖确定为奶牛粪便管理系统中CH4的来源。我们的目标是量化新墨西哥州东部一家商业奶牛场的污水池中夏季CH4的排放量。研究在2009年8月（2009年）的8天中，在一个拥有3500条小巷的奶牛开放场奶牛场中进行。使用开放式激光光谱仪测量了三个泻湖（总面积1.8公顷）中的甲烷浓度。使用带有火焰离子化的反吹气相色谱系统测量背景CH4浓度。使用三轴声速风速计测量风和湍流数据。使用逆扩散模型估算排放量。泻湖中空气中的甲烷浓度范围为3至12 ppm，平均为5.6 ppm，背景CH4浓度为1.83 ppm。甲烷通量密度（即排放速率/单位面积）范围为165至1184μg/ m（2）/ s，平均每日CH4通量密度为402 kg / ha / d。甲烷平均排放量为0.211千克/头/天。未发现的厌氧泻湖是这个南部高平原奶牛场排放的CH4的来源，而泻湖可能是减排的控制点。本文是《动物农业中的温室气体在食物与排放之间找到平衡》这一特刊的一部分。 ，访客由TA编辑。麦卡利斯特（McAllister），客座编辑：K.A。 Beauchemin，X。Hatt S. McGinn和动物饲料科学与技术编辑。 P.H.鲁滨逊由Elsevier B.V.发布

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