Effects of Immobilization Remediation of Cadmium Contaminated Paddy Soil on Cadmium Accumulation and Soil Properties in Different Rice Varieties

SUN Guohong; LI Jianrui; LIANG Xuefeng; HUANG Qingqing; XU Yingming

doi:10.13522/j.cnki.ggps.2017.02.004

Abstract：In order to study the difference of the accumulation of Cd in different rice varieties under palygorskite immobilization remediation of cadmium contaminated paddy soil,pot experiments were conducted to investigate the effect of palygorskite immobilization remediation of cadmium contaminated paddy soil on Cd accumulation in different rice varieties,and soil enzyme activity and nitrogen and phosphorus availability.The results showed that T You 272 rice biomass was 7.91%higher than the Feng You 9 rice,but there was no statistically significant difference.Under palygorskite immobilization remediation,the soil pH values of planting T You 272 and Feng You 9 were increased by 0.33~0.46 and 0.40~0.53,respectively.Under PL1F,PL2F and PL3F treatment,the maximum decrease of soil available Cd was 13 .59%,and the Cd of brown rice was decreased by 20.51%~50.28%,and the Cd content of brown rice under PL3F treatment was 0.19 mg/kg.In addition,the maximum de-crease of soil available Cd was 25.08%,and the maximum reduced of brown rice Cd was 37.50% under PL1T, PL2T and PL3 T treatment,and the Cd content of brown rice under PL3 T treatment was 0.35 mg/kg.The soil en-zyme activity was increased gradually with the increase of the amount of palygorskite added,and the soil enzyme activity of T You 272 was higher than that of Feng You 9.With the increase of the amount of palygorskite added, the soil alkali solution nitrogen had no significant difference in different treatments,but the content of available phosphorus in soil decreased gradually.Compared with CK,the contents of soil available phosphorus under PLF and PLT treatments could be decreased by 7.08%~18.08%and 9.02%~19.59%,respectively.The research re-sults could provide the scientific basis for immobilization remediation of cadmium contaminated paddy soil com-bined with low Cd accumulation of rice varieties.