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| Effects of Combined Amendments on Physicochemical Properties and Available Nutrients of Soil Contaminated with Heavy Metals |
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| KeyWord:combined amendments; soil; available nutrient; heavy metal; soil physicochemical properties |
| Author Name | Affiliation | | QIU Qiong-yao | Institute of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China） | | ZHOU Hang | Institute of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China） | | ZENG Hui | Institute of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China） | | WANG Ying-jie | Institute of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China） | | LIAO Bo-han | Institute of Environment Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, China） |
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| Abstract: |
| Chemical fixation is one of remediation techniques for heavy metal contaminated soils. This study was designed to examine and evaluate the effects of combined amendments（calcium carbonate + sepiolite） on soil pH, organic matter content, available micronutrients in soil, and contents of Pb and Cd in brown rice. Compared to the control, application of combined amendments decreased contents of Pb and Cd in brown rice, and elevated soil pH（from 5.57 to 7.34） and CEC by 217% at 16 g·kg-1 of combined amendments）. No significant changes were observed in soil organic matter（range from -2% to 7%）. Soil exchangeable Ca and Mg were enhanced by 293% and 22%, respectively, after application of combined amendments. Soil available N, P and K did not show significant correlationship with amounts of combined amendments. Soil available Fe reduced in the amendment treatments, but had no relation with application rates. These results indicate that application of combined amendments（calcium carbonate + sepiolite） could increase soil pH, improve soil nutrient holding capacity, and decrease heavy metals in brown rice. |
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