Effects of soil dressing proportion on arsenic availability in soil and rape
To explore the long-term effects of soil remediation on arsenic-contaminated soil,micro-area experiments were performed in the Scientific Observation and Experiment Station of Yueyang,Ministry of Agriculture and Rural Affairs.The effects of different mixing ratios of soil dressing and polluted soil on soil arsenic content,rape growth,and arsenic absorption were evaluated.The results showed that the content of available arsenic in polluted soil was reduced by soil dressing,and this decrease was positively correlated with the proportion of soil dressing:the arsenic absorption of rapeseed decreased with the increasing proportion of soil dressing.When the proportion of soil dressing was 40%,the biomass of stems,leaves,and seeds reached the maximum value,which increased by 7.8%and 12.8%compared with the polluted soil.In addition,the arsenic content of root,stem,leaf,and seed decreased by 67.4%,68.4%,and 82.2%,respectively,compared with the polluted soil.With the increased proportion of soil dressing,the mean weight diameter of soil aggregates increased,whereas the soil pH and cation exchange capacity decreased.The proportion of soil dressing had significant effects on soil available arsenic and physicochemical indexes such as pH,aggregate average weight diameter,cation exchange capacity,and other physical and chemical indexes,and the appropriate proportion of soil dressing promoted the growth of rape and greatly reduced its arsenic content.
soil dressing proportionavailable arsenicrapesoil physicochemical propertyabsorption of arsenic
万方数据
维普
