College of Tropical Crops;
Hainan University;
Haikou 570228;
China;
School of Environmental and Chemical Engineering;
Foshan University;
Foshan 528000;
China;
Department of Primary Industries;
Elizabeth Macarthur Agricultural Institute;
Menangle;
NSW 2568;
Australia;
Institute of Agricultural Environment and Soil;
Hainan Academy of Agricultural Sciences;
Haikou 571100;
China;
Key Laboratory of Arable Land Conservation of Hainan Province;
Haikou 571100;
China;
DOM; Commercial organic fertilizer; Parallel factor analysis; Two-dimensional correlation; spectroscopy; Lead(Pb);