Characteristics and controlling factors of soil dissolved organic matter in the rainy season after vegetation restoration in a karst drainage area, South China

[Display omitted] •karst drainage soil DOM was characterized by EEMs-PARAFAC.•Different vegetation restoration types affect soil DOM quality.•Karst hydrodynamic processes control the migration and loss of DOM. Dissolved organic matter (DOM) has strong reactivity and migration ability, which affects biogeochemical processes such as nutrient cycling. Karst ecological vulnerability has been widely discussed. However, the characteristics of soil DOM, the main energy matrix of the soil, in the process of rocky desertification control have rarely been reported. This study examined the characteristics of DOM in shallow soil after vegetation restoration in a karst area. Soil samples of 5 vegetation restoration types (abandoned land, AL; grassland, GL; peanut cultivated land, PCL; Zanthoxylum bungeanum land, ZBL; forest, FS) and water samples from the drainage were collected. DOM in soils of different vegetation restoration types was characterized by UV–Vis absorption spectroscopy and fluorescence excitation emission matrix (EEM)-parallel factor analysis (PARAFAC), and the fluorescent components of DOM in the soil and water samples were identified. Redundancy analysis (RDA) was used to identify the controlling factors of optical soil DOM characteristics. The results showed the following: (1) the DOC/SOC