Linking DOC and DON Fluxes to Soil Properties at Watershed and Landscape Scales

将 DOC 和 DON 通量与流域和景观尺度的土壤特性联系起来

• 批准号: 0108385
• 负责人: William McDowell
• 金额: $ 67.91万
• 依托单位: University of New Hampshire
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2007-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0108385&HistoricalAwards=false
• 关键词: Linking; DOC; DON; Fluxes; Soil

Recent work by the PI's shows that at a global scale, soil carbon:nitrogen (C:N) is a very strong predictor of dissolved organic carbon (DOC) losses in surface runoff. If this relationship holds at the watershed and landscape scale, then soil C:N would provide a powerful tool for predicting and modeling changes in DOC flux. In this project, the PIs will examine the nature of the relationship between soil properties and DOC flux in wet tropical forests of Puerto Rico, the northern mixed forests of New Hampshire and a heath/moorland in Scotland. The proposed research examines the value of soil D:N in predicting variability in DOC flux within the three ecosystems, and also examines some of the underlying physical and biological mechanisms which may be responsible for the linkage between DOC flux and soil C:N recently documented at the global scale. The research will include empirical and modeling components and is expected to result in a better understanding of the mechanisms regulating DOC losses in tropical and temperate sites. The broader implications of this work relate to watershed management in that dissolved organic carbon and nitrogen have important effects on surface water quality. Trace metal solubility, formation of trihalomethanes in drinking water supplies, and pesticide transport are all linked to DOC levels.

PI 最近的工作表明，在全球范围内，土壤碳：氮 (C:N) 是地表径流中溶解有机碳 (DOC) 损失的有力预测因子。 如果这种关系在流域和景观尺度上成立，那么土壤 C:N 将为预测和模拟 DOC 通量的变化提供强大的工具。 在该项目中，PI 将研究波多黎各潮湿热带森林、新罕布什尔州北部混交林和苏格兰荒地/沼泽地土壤性质与 DOC 通量之间关系的性质。 拟议的研究考察了土壤 D:N 在预测三个生态系统内 DOC 通量变异性方面的价值，并考察了一些可能与最近记录的 DOC 通量和土壤 C:N 之间联系的潜在物理和生物机制。在全球范围内。 该研究将包括实证和建模部分，预计将有助于更好地理解热带和温带地区 DOC 损失的调节机制。 这项工作的更广泛的影响涉及流域管理，因为溶解的有机碳和氮对地表水质量有重要影响。微量金属的溶解度、饮用水中三卤甲烷的形成以及农药的迁移都与 DOC 水平有关。