Factors controlling the release of dissolved organic substances, their stability and impact in methanogenic inundated fens soils

今天，面对气候变化、水道富营养化和生物多样性减少，各国和国际上都在努力保护泥炭地，或通过恢复措施修复其在景观中的功能。在过去，通过重新润湿措施来恢复退化的沼泽通常会形成新的、高产的浅湖。这些新建立的系统的一个问题是，在重新润湿的初始阶段，伴随着大量的甲烷、磷和溶解有机质的释放。一个重要的原因可能是，在上部退化的泥炭层和新形成的沉积层中，缺乏作为抑制物质的酚类物质，增加了活性有机物的可利用性，以及有利的外源因素。我们项目的主要目标是确定控制溶解有机物释放和伴随的高甲烷释放的因素。这项工作有望对物质周转的理解做出重大贡献，从而为长期的复湿沼泽的演替做出贡献。

Today, In the face of climate change, eutrophication of watercourses, and decreasing biodiversity, there are national and international efforts to protect peatlands or to repair their functions in the landscape through restoration measures. In the past, restoring degraded fens by rewetting measures has often led to the formation of new, highly productive shallow lakes. One problem of these new established systems is that in the initial stage of rewetting is accompanied by high release of methane, phosphorus and dissolved organic matter. One important reason might be the lack of phenolics as inhibiting substances, the enhanced availability of labile organic matter as well as favourable exogenic factors in the upper degraded peat layer and in the newly formed sediment layer. The main objective of our project is the identification of factors controlling the release of dissolved organic matter and the concomitant high methane release. This work is expected to make a significant contribution to the understanding of matter turnover and therefore for the succession of rewetted fens in long-term.