The Relationship Between The Heavy Metal Fraction Of Yellow Soil And Quality Of Kiwifruit In Guizhou

Heavy metals in crops that are polluted by heavy metals tend to exceed the national standard,and these heavy metals are absorbed through the food chain and accumulate to reach the human body.When its concentration is too high,it can directly threaten human health.Therefore,the crop’s soil environment and its The analysis of the content of heavy metals in agricultural products has also become a hotspot in scientific research.This paper focuses on the evaluation of soil heavy metal content,occurrence pattern and kiwi fruit quality of Guizhou kiwifruit cultivation base,and has accumulated some data and scientific basis for soil environmental protection and management in these parks.In this study,the contents of heavy metals Pb,Cd,Cr,Hg,As,Ni,Cu and Zn in the kiwi garden were investigated by field investigation,soil samples and experimental analysis.And quality indicators for analysis and testing,the use of spss22.0 principal component analysis,clustering analysis and Pearson correlation analysis for data processing.The main findings are as follows:(1)the soil pH of kiwi fruit base ranges around 3.85~7.24 and the mean value was 5.09,in addition to Monkey Township,a sampling point,the rest of the park are acidic soil.The results of principal component analysis show that the first principal component eigenvalue is 3.326,the variance contribution rate is 41.578%,and the characteristic is Cu,Zn and Pb have higher positive load on the first principal component.The characteristic value of the second principal component is 1.493,the variance contribution rate is 18.659%,the characteristic is Ni,Cr has a higher positive load on the second principal component;the eigenvalue of the third principal component is 1.121,the variance contribution rate is 14.015%,and the characteristic is Hg The third principal component has a higher positive load.The results of cluster analysis showed that the Cd,Hg,Pb and As heavy metals in kiwifruit base were closely related,indicating that the accumulation of heavy metal elements in kiwi base may come from the same pollution source,which analyzes the heavy metal content of kiwi base,Prevention of soil heavy metal pollution has a good guiding role.The analysis of the comprehensive heavy metal content indicates that Ni is in a mild pollution from the single factor pollution index,and that the other elements are within the cordon,but special attention is required to prevent the increase in pollution from crop effects;Index,point of view,Long feet pollution level for the safety,did not reach the level of pollution;ear,put Ma Ping,organic kiwi base are in the cordon,Mi Lu Xiang,monkey field Township,the village rural Shun Township,And the soil background value of Guizhou Province is relatively high,but the soil environmental quality still needs attention and control the exogenous input of heavy metals in Guizhou Province.(2)Guizhou yellow soil kiwi base kiwi quality to meet the national agricultural industry standards.The average content of soluble sugar was 12.7014%,the average content of soluble solids was 13.0219%,the average content of titratable acid was 1.169%,the average solid acid ratio was 11.822,the ratio of sugar to acid was 11.490,the average content of VC was 119.064 mg / 100 g,to meet the national agricultural industry standards.The average contents of Ni,Cr,Pb,Cd,Hg and As in the leaves,leaves and fruits were significantly different.The average contents of Cu and Zn were stem> leaf> fruit.Among them,the content of heavy metals in kiwifruit fruit samples is in the range of content stipulated in the national agricultural industry standard.(3)The main occurrence forms of Cr,Pb,Hg,Cu and Zn in the soil of Kiwifruit in Guizhou were the dominant species of residual and organic matter,and the contents of exchangeable and carbonate-bound were few.And Cd mainly in the exchangeable state and iron and manganese combined with bio-active state-based.The morphological differences of different heavy metal elements were significant,and the pH had a great effect on the distribution of heavy metals.The exchangeable Cd,exchangeable As,Fe-Mn-bound Pb,Pb-Pb and Pb There was a significant negative correlation between Cu and Mn,exchangeable Cu,residual Cu and soil total Cu and pH,and Zn was positively correlated with pH.(4)There was a significant positive correlation between exchangeable Cr,Fe-Mn-bound Ni and organic-bound Ni in kiwifruit garden of Guizhou,and had significant negative correlation with kiwifruit vc.The carbonate-bound A was negatively correlated with kiwifruit vc;There was a significant negative correlation between Cr and Kiwifruit organic acids.Iron and manganese combined Cr,residual Cr,soil heavy metal total Cr and iron and manganese combined with Ni and kiwi organic acid was significantly negatively correlated.There was a significant negative correlation between intergranular Cd and organic Cd in organic matter,and there was a significant positive correlation between exchangeable Cr and kiwifruit vc and organic acid of kiwi fruit.Under low concentration stress,the plant vc content Improve the organic acid,due to the normal growth and development process,the plant body generally contain a certain amount of Cr,moderate content can promote plant growth and enhance its resistance to disease,the Guizhou kiwi fruit orchard soil exchangeable state The average content of Cr is 0.016 mg / kg,which is an adaptive expression of plant pollution.