Hydro-physical and carbon properties of peat across peatland types and climate zones

作者：Ji Qi, Sophia Weigt, Miaorun Wang, Fereidoun Rezanezhad, William L. Quinton, Dominik Žák, Sate Ahmad, Lingxiao Wang, Ying Zhao, Bernd Lennartz, Haojie Liu · 发表于：Geoderma · 年份：2025 · DOI：10.1016/j.geoderma.2025.117480 · 被引用次数：4 · 研究领域：Peatlands and Wetlands Ecology、Climate change and permafrost、Coastal wetland ecosystem dynamics

The hydro-physical properties of peat play a pivotal role in regulating the water, nutrient, and carbon cycles of peatland ecosystems. However, our understanding of peat hydraulic properties remains limited, especially at a global perspective. In this study, we compiled a comprehensive global database of the peat physical, hydraulic, and chemical properties, including bulk density (BD), porosity, macroporosity, saturated hydraulic conductivity ( K s ), carbon content, and carbon density, encompassing tropical peatlands, boreal and temperate fens and bogs, and permafrost regions. Our primary objective was to examine how these properties varied along a BD gradient across peatland types and climate zones. The results revealed a robust linear relationship between carbon density and BD for various peatland types with carbon content exceeding 35 % ( R 2 > 0.93, p < 0.001). The carbon density of tropical peatlands was more sensitive to changes in BD than that of boreal and temperate peatlands. Total porosity was found to decrease linearly as BD increased, while macroporosity followed a power-law relationship with BD. These trends were consistent across all peatland types, underscoring a strong and reliable association between BD and both total porosity and macroporosity. Additionally, K s exhibited a general decline with increasing BD, with the relationship characterized by log–log functions that varied among peatland types and climate zones. These findings indicated that hydraulic ...