Dissolved organic matter (DOM) composition exerts a direct control on its degradation and subsequent persistence in aquatic ecosystems. Yet, under certain conditions, the degradation patterns of DOM cannot be solely explained by its composition, highlighting the relevance of environmental conditions for DOM degradation. Here, we experimentally assessed the relative influence of composition vs. environment on DOM degradation by performing degradation bioassays using three contrasting DOM sources inoculated with a standardized bacterial inoculum under five distinct environments. The DOM degradation kinetics modeled using reactivity continuum models showed that composition was more important than environment in determining the bulk DOM decay patterns. Changes in DOM composition resulted from the interaction between DOM source and environment. The role of environment was stronger on shaping the bacterial community composition, but the intrinsic nature of the DOM source exerted stronger control on the DOM degradation function.

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环境与组成对淡水中可溶性有机物降解的相关性

溶解性有机物（DOM）的组成对其降解和随后在水生生态系统中的持久性具有直接控制作用。但是，在某些条件下，不能仅通过DOM的组成来解释DOM的降解模式，这突出了环境条件与DOM降解的相关性。在这里，我们通过使用在五个不同环境下接种了标准细菌接种物的三种对比DOM来源进行降解生物测定，通过实验评估了成分与环境对DOM降解的相对影响。使用反应性连续体模型建模的DOM降解动力学表明，在确定整体DOM衰减模式方面，组成比环境更重要。DOM组成的变化是由于DOM源与环境之间的交互作用引起的。