1. College of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; 2. Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan 430081, China; 3. Institute of Agriculture Resources and Regional Planting, Beijing 100081, China
Abstract：The 13 representative forest soils were selected in different climatic zones with various forest stands across the mainland of China. The soils were spiked with cadmium and then the distribution characteristics of soil solid-solution partition coefficient (Kd) and soil available cadmium (Cd) concentrations were analyze. The influences of soil/solution properties on Kd and soil available cadmium, and the corresponding empirical prediction models were further explored. Kd values varied from 0.91 to 623.66 L/kg with the average value of 53.11L/kgand variation of 684.37 folds between the maximum and minimum values in different spiked Cd treatments. The Cd concentration in soil pore water (PW-Cd) ranged from 0.309 (S13) to 104.450mg/L (S4) with the variation of 338 folds. The differences of DTPA extractable Cd (DTPA-Cd) contents were 9 and 1.4 folds, for the treatment of no Cd spiked soils and largest spiked dosage 128mg/kg, respectively. The results also showed that the pH positively correlated with Kd (R2=0.49, P<0.001) and inversely correlated with PW-Cd contents (R2=0.41, P<0.05). Single soil solution Mg2+ concentrations could explain 46% variance of the DTPA-Cd concentrations. No single controlling significant soil properties were found to affect the soil soil-liquid partition coefficient (Kd) according to the multiple regression equations. The simulation models were slightly improved by incorporation of other soil/solution properties. In conclusion, the soil solution pH and Mg2+ was two controlling factors.
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