Dissolved and particulate organic carbon transport among forest, river, and wetland ecosystems: a review of processes, controlling factors, challenges, and prospects

作者：Yan Li, Zelin Liu, Li Peng, Xiaolu Zhou, Zhengmiao Deng, Ziying Zou, Jiayi Tang, Cicheng Zhang, Tong Li, Changhui Peng · 发表于：Environmental Reviews · 年份：2025 · DOI：10.1139/er-2024-0078 · 被引用次数：9 · 研究领域：Peatlands and Wetlands Ecology

Streams and rivers receive organic carbon (OC), including dissolved (DOC) and particulate (POC) forms, from forests and wetlands, playing a vital role in terrestrial and aquatic ecosystems. Despite growing interest in OC dynamics, its cross-ecosystem migration remains poorly understood and reviewed. This review synthesizes key DOC and POC transport processes, controlling factors, and tracing methods across forests, wetlands, and rivers, aiming to deepen the understanding of carbon dynamics across different ecosystems. It also discusses current research gaps, challenges, and prospects. In forests and wetlands, DOC is mainly derived from vegetative carbon sinks, rainfall wash-off, and organic matter decomposition, while POC is derived from vegetative surface wash-off, rock weathering, and plant residues. Through soil respiration, overland flow, interflow, and leaching losses, with significant contributions from groundwater as well, some of the OC is released to the atmosphere and some enters the river system. DOC and POC sources are classified as exogenous and endogenous within river systems. Exogenous sources mainly enter runoff, including apoplastic litter, humus, root secretions, and anthropogenic releases from agriculture, industry, and households. Notably, most of the POC produced by erosion on slopes does not reach rivers. Endogenous sources originate from overall biological activity within the river. The main export pathways for DOC and POC in aquatic systems are CO 2 re...