Pedosphere 9(2): 177--184, 1999
ISSN 1002-0160/CN 32-1315/P
©1999 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Fractionation of added cadmium in submerged soils as affected by organic materials |
| WANG Guo, GAO Shan, WANG Yong-Cheng and CAI Hai-Yang |
| Department of Land and Environmental Science, Fujian Agricultural University, Fuzhou 350002 (China) |
| ABSTRACT |
| The effect of three organic materials (rice straw, Chinese milk vetch and pig manure) on the fractionation of cadmium added into two soils (a red soil and a fluvo-aquic soil) was studied using submerged incubation experiment. The organic materials increased soil solid organic carbon (SOC), pH value, the concentration of active Si in all the treatments and active Fe and Mn in some treatments. Accumulated SOC caused directly the increase of Cd bound to solid organic matter and consequently the decrease of exchangeable Cd. Higher active Si and pH, as well as lower Eh, were also responsible for the reduction of exchangeable Cd. Cd bound to Mn oxide was positively correlated with pH values and rose significantly after one-month incubation, but decreased after three-month incubation. Cd bound to amorphous Fe oxide increased with the incubation time, but was not affected significantly by adding organic materials. |
| Key Words: cadmium, fractionation, organic materials, solid organic carbon (SOC), submerged soil |
| Citation: Wang, G., Gao, S., Wang, Y. C. and Cai, H. Y. 1999. Fractionation of added cadmium in submerged soils as affected by organic materials. Pedosphere. 9(2): 177-184. |
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