The Study On Soil And Rice And Wheat Seeds In Cd The Relationship Between Dose Effect And Safe Use Evaluation In Southern XX Town As An Example

With the frequent heavy metal pollution nationwide lead poisoning and food and blood heavy metal exceed the standard and other events,the results showed that heavy metal pollution is increasingly serious,serious threat to the environment of origin of agricultural products,is easy to damage the soil ecosystem and water environment,atmosp Heric pollution,endangering the agricultural production and food security,serious threat to human health.In this paper,the southern town of XX as the study area,the layout of 53 sampling points,and field samples,the content of Cd in soil,rice and wheat seeds as the research object,using GIS,SPSS and Excell software as the foundation,combined with the three spline interpolation method,regression analysis method,the heavy metal pollution evaluation method and the spatial analysis methods,developing soil and rice and wheat seeds in Cd dose effect and safety evaluation of agricultural land use in oeder to the safe use of cadmium pollution to provide technical support for optimal allocation.The results show that the effect of content of rice and wheat seeds in Cd was mainly affected by soil Cd concentration,p H,soil organic C and CEC.Dose-effect formula of soil and in rice seed for Cd: SCd(Soil Cd concentration)<0.299 mg/kg,Rc Cd(The concentration of Cd in rice seed)= Fitted values,? SCd?0.299 mg/kg,Rc Cd=0.808+0.714×Fitted values-0.073×p H-0.036×CEC;dose-effect formula of soil and wheat seeds for Cd: SCd<0.299 mg/kg,WCd(The concentration of Cd in wheat seeds)= Fitted values;SCd?0.299 mg/kg,WCd=0.339+0.619×Fitted values-0.016×p H-0.03×CEC+0.003×Organic C;Rice,wheat seed is really the national food safety standards for food pollution in the soil Cd Safety limit of STRc=0.541mg/kg and STW=0.295mg/kg;The rice point of the safe use of the evaluation results are: 31 no risk,9 slight risk,3 low risk,2 medium risk,8 high risk,wheat point of the safe use of the evaluation results are: 27 no risk,9 slight risk,1 low risk,2 medium risk,14 a high risk;Rice and wheat are grown in the agricultural land use safety results distribution area is roughly the same as that of the higher risk areas in the study area of the eastern,middle and low risk zone mainly around the high risk zone,and minor risk areas are mainly concentrated in the research area of the northern and western regions,the safety of rice using the evaluation results are: 212932.40 acres no risk of 45292.48 acres of 13816.87 acres of slight risk,low risk,the risk of 5166.012 acres,10764.07 acres of wheat with high risk,safety evaluation results are: 122343.90 acres,83705 acres of no risk,small risk,low risk 21135.07 acres,35673.08 acres of 24957.84 acres of high risk,risk;Through the exchange of wheat and rice,two planting patterns can make 12 points(51322.65 acres)from the lower risk for no risk,14 points(16083.34 acres)can be reduced by at least one level of safety evaluation,it can be seen that to achieve the safe use of the potential is huge by changing crop varieties in agricultural in.