From Overall to Unique Molecules: Resolving Regional Patterns and Site-specific Heterogeneity of Dissolved Organic Matter in Seasonally Frozen Soils of Northeastern China

This dataset contains mass spectrometric data on overall and unique dissolved organic matter (DOM) molecules in seasonally frozen soils across northeastern China. It includes detailed analytical information such as assigned molecular formulas, m/z values, relative abundances, and other molecular-level characteristics, supporting both overall and unique molecular approaches for analyzing spatial distribution patterns and site-specific heterogeneity of DOM.