Dissertation Research: Contributions of Charophycean Algae & Sphagnum Moss to Long-term Carbon Storage in Boreal Peatlands. Dissolved Organic Carbon Uptake & Carbon

论文研究：轮藻纲藻类的贡献

• 批准号: 9410843
• 负责人: Linda Graham
• 金额: $ 2.78万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-07-01 至 1996-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9410843&HistoricalAwards=false
• 关键词: Dissertation; Research; Contributions; Charophycean; Algae

Graham Boreal peatlands are a recognized site of carbon accumulation. Recent data suggests the occurrence of two potential mechanisms for carbon retention that have not previously been quantitatively assessed, namely, the uptake and utilization of dissolved organic carbon (in the form of sugars), and production of degradation-resistant cell wall polyphenolics by charophytes and Sphagnum moss. The first of these processes removes liable forms of fixed carbon from the environment, while the second generates relatively long-term storage forms of carbon. Both processes interfere with the ability of bacteria to convert fixed carbon back to CO2, and thus contribute to peatland carbon accumulation. Cultured charophytes and Sphagnum will be used for cloning and sequencing of sugar transport genes, and for gene expression studies. Field data for charophyte diversity and biomass will be correlated with field measurements of pH, DOC, DIC, and bacterial biovolumes, and with species-specific abilities to load sugars and generate polyphenolic wall compounds measured with the use of laboratory cultures. Assessments of Sphagnum production of resistant wall materials and utilization of DOC by protonematal stages will also be made. The goal of the project is to improve estimates for the amount of carbon sequestered in peatlands.

格雷厄姆北方泥炭地是公认的碳积累场所。 最近的数据表明，发生了两个潜在的机制，以前没有定量评估，即溶解的有机碳（以糖的形式）的吸收和利用的碳保留，和生产抗降解的细胞壁多酚轮藻和泥炭藓。 第一个过程从环境中去除了易受影响的固定碳形式，而第二个过程产生了相对长期的碳储存形式。 这两个过程都干扰了细菌将固定碳转化为CO2的能力，从而有助于泥炭地碳积累。 培养轮藻和泥炭藓将用于糖转运基因的克隆和测序，以及基因表达研究。 轮藻多样性和生物量的实地数据将与pH值，DOC，DIC和细菌生物量的实地测量，并与特定物种的能力，以加载糖和产生多酚壁化合物测量使用实验室培养。 泥炭藓的抗性壁材料的生产和利用DOC的原丝体阶段也将作出评估。 该项目的目标是改善对泥炭地固碳量的估计。