DISSERTATION RESEARCH: Trace N Gas Efflux From Aridland Systems: Partitioning Abiotic and Biotic Drivers

论文研究：干旱地区系统中的痕量 N 气体流出：非生物和生物驱动因素的划分

• 批准号: 0709642
• 负责人: Jed Sparks
• 金额: $ 1.2万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-01 至 2009-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0709642&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Trace; Gas; Efflux

Recent evidence suggests that the cycling of elements between the soil and the atmosphere can be the result of light-driven non-biological reactions. This project will explore the role of solar radiation as a cause of reactive nitrogen gas emissions from soil. Our understanding of the production of these gases is based on biological processes driven by soil microorganisms. However, preliminary measurements from the Mojave Desert suggest that abiotic processes driven by light may also contribute to nitrogen gas losses. This study will partition abiotic and biotic sources of trace nitrogen gas emissions from desert soils using (1) laboratory measurements of the effect of light intensity on nitrogen gas emissions from soils in which biological activity has either been stimulated or repressed and (2) field measurements utilizing daily variation in solar radiation and seasonal changes in biological activity to identify the role of light in describing patterns of trace nitrogen gas emissions. Gaseous reactive nitrogen compounds produced from soils play an important role in the atmospheric chemistry defining climate and air quality. The findings from this research will both increase our understanding of the global nitrogen cycle and allow us to re-evaluate our predictions of how these processes will change in the future.

最近的证据表明，土壤和大气之间的元素循环可能是轻度驱动的非生物反应的结果。 该项目将探讨太阳辐射作为土壤反应性氮气排放的原因。 我们对这些气体产生的理解是基于由土壤微生物驱动的生物学过程。 但是，莫哈韦沙漠的初步测量表明，由光驱动的非生物过程也可能导致氮气损失。 这项研究将使用（1）使用（1）实验室测量光强度对生物学活动的氮气排放的影响，在生物学活动中刺激或（2）实地测量在生物辐射和季节性变化中鉴定出生物学活动的变化，从而对生物学的变化进行了刺激，从而对沙漠土壤中的痕量氮气排放的非生物和生物来源进行分配。由土壤产生的气态反应性氮化合物在定义气候和空气质量的大气化学中起着重要作用。 这项研究的发现既会增加我们对全球氮周期的理解，又使我们能够重新评估对这些过程将来将如何变化的预测。