Patterns in Dissolved Organic Matter Lability and Consumption across Aquatic Ecosystems

摘要: Publisher Summary The purpose of this chapter is to explore cross-system patterns in Dissolved Organic Matter (DOM), bioavailability with data obtained from vitro bioassays. key components the cycling organic matter biosphere: its production, transformation, and degradation. In aquatic ecosystems, heterotrophic bacteria participate all three are primarily responsible for bulk degradation matter. biological availability DOM microbes a property that determines turnover eventual fate pool. composed various pools, each characterized by distinct chemical composition differences microbes. these pools varies widely, ranging minutes hundreds years or even longer. There appears be systematic lability among ecosystem types, once results bioassays standardized time temperature. consumption during appear very different marine lake samples compared estuaries freshwaters. terms proportion highly reactive versus, less reactive, recalcitrant other systems, pattern most likely related origin DOM. Results suggest intrinsic characteristics play an important role regulating bacterial metabolism ecosystems. greatest challenge still accurately determine small changes within relatively large background pool dissolved carbon (DOC).