Non-Methane Hydrocarbon Emissions from Plants

9633285秋季植物是向大气排放非甲烷碳氢化合物的重要来源，但影响陆地植被排放这些化学物质的生化和生理因素尚未得到很好的了解。本项目研究了黄松和其他松树的2-甲基-3-丁烯醇（甲基丁烯醇）的产生和排放。甲基丁烯醇是在松林中测量到的一种微量大气成分，被归类为含氧碳氢化合物（oxhc）。oxhc被假设为一组潜在的重要化合物，在地球行星边界层和自由对流层的整体光化学中很重要。除了研究松木物种生产甲基丁醇的生化机制外，该项目还试图建立这种化合物与松柏合成的其他类异戊二烯化学物质的酶促形成的关系。该项目的结果将使人们更好地了解调节天然氧化hc向大气排放的生物和环境因素。这些知识对于开发预测算法和模型是必要的，这些预测算法和模型将根据环境条件和植物代谢的季节变化来估计氧合碳的通量。＊＊＊

9633285 Fall Plants are a significant source of non-methane hydrocarbons to the atmosphere, yet the biochemical and physiological factors that influence these chemical emissions from terrestrial vegetation are not well understood. This project investigates the production and emission of 2-methyl-3-buten-2-ol (methylbutenol) in ponderosa pine and other pine species. Methylbutenol is a trace atmospheric constituent that has been measured in pine forests and is classified as an oxygenated hydrocarbons (oxHCs). The oxHCs are hypothesized as a potentially significant group of compounds that is important in the overall photochemistry of the Earth s planetary boudary layer and free troposphere. In addition to study of the biochemical mechanism of methylbutanol production in pine species, the project seeks to establish the relationship of this compound to the enzymatic formation of other isoprenoid chemicals synthesized by conifers. Results from the project will provide improved understanding of the biological and environmental factors that regulate the emission of natural oxHC to the atmosphere. This knowledge is necessary for developing predictive algorithms and models that will estimate fluxes of oxHCs in response to environmental conditions and to seasonal changes in plant metabolism. ***