Nitrous oxide emissions from milking production - system boundary farm

在气候变化的背景下，其原因和动态，畜牧业的贡献是有争议的讨论。但要进行综合评估，不仅甲烷排放量和过程能耗重要；此外，一氧化二氮的排放非常重要，不应该被忽视，因为它与气候有很强的相关性。然而，关于生物技术系统“农场牛奶生产”中氧化亚氮的形成、释放和排放的知识是粗略的。因此，本项目提案的首要目标是捕获谷仓以及上游和下游地区（例如饲料和有机废物）排放的氧化亚氮的行为。为此，计划在整个系统的稳定水平和排放活跃的子区域进行测量。根据研究结果，应建立排放预测模型，并研究和验证减少一氧化二氮排放的措施。对于稳定水平的研究，农业工程研究所开发了测量方法来确定浓度的增加，并进一步开发了对成分“氧化亚氮”的空气流量。为此，应将真空玻璃容器采样技术纳入测量概念，实现准连续采样。浓度测定将在实验室用气相色谱法延迟进行。在排放活跃分区的调查中，气体样本采用经过验证的罩式技术（“封闭室”方法）进行。实验室一级的浓度测量也与波恩大学作物科学和资源保护研究所合作进行。获得的发现形成了一个数据库，用于计算牛奶生产产生的温室气体排放总量，并在实践中证明减缓一氧化二氮的措施。

Against the backdrop of climate change, its causes and dynamics, the contribution of cattle farming is discussed controversially. But for a comprehensive assessment are not only the methane emissions and the process energy important; also the nitrous oxide emissions are very significant and shouldn't be disregarded because of the strong climate relevance. However the knowledge about formation, release and emission of nitrous oxide from the biotechnical system "milk production on the farm" are sketchy.Hence the superior aim of this project proposal is to capture the action of nitrous oxide emissions in barn as well as the upstream and downstream of the areas (for example from feed and the organic waste). To this measurements are planned on stable-level and emission-active subareas of the entire system. From the findings, a model for emissions forecast should be created and measures to reduction of nitrous oxide emissions should be investigated and validated.For the investigations on stable-level, the at the Institute of Agriculture Engineering developed measuring methods to determine the increase of concentration and the air flow volume should be applied and developed further for the component 'nitrous oxide'.For this purpose, a sampling technique with vacuumed glass containers should be integrated into the measurement concept, so that a quasi-continuous sampling can be realized. The concentration determination will take place time-delayed by gas chromatography in the laboratory.At the investigations of the emission active subareas the gas samples are carried out with a proven hood technology ("closed chamber" method).The concentration measurements at laboratory level are also held in collaboration with the Institute of Crop Science and Resource Conservation (INRES) of the University of Bonn.The gained findings form the database to calculate the total greenhouse gas emissions from milk production and to prove mitigation measures for nitrous oxide in practice.