Plant Controls of Terrestrial Trace Gas Fluxes: Legumes, Microbes, CO and Hydrogen

这项研究旨在确定植物-微生物相互作用对大气中关键微量气体的产生和命运的作用，特别是一氧化碳（CO）和氢气（H2）。最近的观察表明，所有植物的根都产生CO，固氮植物（豆科植物，通常是豆科植物）的根产生大量的CO和H2。这些气体的产生为植物根系与氧化CO和H2的土壤微生物的相互作用提供了基础。田间和温室研究将涉及各种栽培和非栽培豆科植物和其他植物分类群。实验分析将包括测量现场气体交换，测量根部气体产生，利用微生物分离和表征痕量气体，以及基于使用16S rRNA和rubisco基因的分子技术的应用。这项研究将有助于了解大气微量气体成分的控制以及土地利用和农业实践的影响。

This research seeks to determine the role of plant-microbe interactions on the production and fate of key trace gases in the atmosphere, particularly carbon monoxide (CO) and hydrogen (H2). Recent observations have revealed that the roots of all plants produce CO, and that the roots of nitrogen-fixing plants (Fabacae, commonly legumes) produce large amounts of both CO and H2. Production of these gases provides the basis for an interaction of plant roots with soil microbes that oxidize CO and H2. Field and greenhouse studies will involve a variety of cultivated and non-cultivated legumes and other plant taxa. Experimental analyses will include measurements of gas exchange in situ, measurements of root gas production, isolation and characterization of trace-gas utilizing microbes, and applications of molecular techniques based on the use of 16S rRNA and rubisco genes. The research will lead to insights about the controls of atmospheric trace gas composition and the impacts of land use and agricultural practices.