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氨度的空间分布和模拟干沉积在密集乳制品生产地区的空间分布

April B Leytem¹, John T Walker², Zhiyong Wu³

¹Northwest Irrigation and Soils Research Laboratory, United States Department of Agriculture-Agricultural Research Service, Kimberly, ID 83341, USA.

Atmosphere

|October 23, 2024

概括

农业对美国的氨 (NH3) 排放有显著的贡献. 像爱达荷州这样的高密度乳制品地区显示NH3热点,影响附近的自然生态系统,干沉积率令人担忧.

科学领域:

环境科学环境科学
大气化学大气化学
农业科学农业科学

背景情况:

农业,特别是畜牧业,是美国氨 (NH3) 排放的主要来源.
这些排放可以通过沉积对敏感生态系统产生负面影响.
密集畜牧业的地区,如爱达荷州的乳制品地区,创造了重要的NH3排放热点.

研究的目的:

测量氨 (NH3) 在一个关键农业地区的空间和时间变化.
为了估计这些地区的氨 (NH3) 干沉积率.
评估农业NH3排放对周围自然生态系统的影响.

主要方法:

从2018年到2020年,在两个跨度的8个地点利用了扩散性被动采样器.
采用表面式气溶和气体交换 (STAGE) 模型来估计NH3流量.
分析了与土地利用 (乳制品,混合农业,自然景观) 相关的NH3度数据.

主要成果:

与其他农业区相比,氨 (NH3) 度在高密度乳制品生产场所是其他农业区的4-5倍.
度是非农业地点的26倍,季节性温度驱动的趋势.
估计每年的干沉积率在密集乳业地区达到了高达45公斤N ha-1 y-1,明显超过自然景观 (<1公斤N ha-1 y-1).

结论:

南爱达荷州农业地区的氨 (NH3) 干沉积超过了北美沙漠的关键负荷.
萨格布拉什草原生态系统正在接受大量的NH3沉积,这可能会影响它们的健康.
需要进一步研究影响美国西部干旱生态系统NH3干沉积的土壤过程.

关键词:

氨是一种氨.这是一种双向的交换.乳制品乳制品是一种乳制品.干燥沉积的沉积方式

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