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

在流域和景观尺度上将DOC和DON通量与土壤性质联系起来溶解有机碳和氮(DOC和DON)是从分解的树叶和土壤中提取的化合物，给水带来味道、气味和颜色。这些化合物会影响水质，增加金属和杀虫剂的溶解度，并在饮用水供应经过氯化处理时导致形成三卤代甲烷(如氯仿)。土壤剖面中的碳氮比(土壤C/N)反映了一个场地的气候、植被、地形和地质情况。PI最近的工作表明，土壤C/N可以准确地预测世界各地小溪和河流中离开陆地生态系统的DOC的数量。这种关系将在波多黎各的一个单一生物群、潮湿的热带森林中进行测试。如果这种关系也适用于生物群，那么土壤C/N可以提供一种工具来预测气候变化可能导致的地表水质量的变化。目前还不存在这样的预测工具。

Abstract99-81600McDowellLinking DOC and DON Fluxes to Soil Properties at Watershed and Landscape ScalesDissolved organic carbon and nitrogen (DOC and DON) are compounds derived from decomposing leaves and soil that impart taste, odor, and color to water. These compounds can affect water quality, increasing the solubility of metals and pesticides, and causing the formation of trihalomethanes (e.g. chloroform) when drinking water supplies are chlorinated. The ratio of carbon to nitrogen in the soil profile (soil C/N) reflects the climate, vegetation, topography and geology of a site. Recent work by the PI shows that soil C/N is an accurate predictor of the amount of DOC leaving terrestrial ecosystems in streams and rivers around the world. This relationship will be tested within a single biome, wet tropical forest in Puerto Rico. If the relationship also applies within a biome, then soil C/N may provide a tool for predicting changes in surface water quality that could occur with changes in climate. Such a predictive tool does not exist at present.