Cd in the soil-crop system in Fenghuang County:Content and migration and enrichment characteristics
To investigate the migration characteristics of heavy metals in the soil-crop system of Fenghuang County,Xiangxi Tujia and Miao Autonomous Prefecture,this study systematically collected 120 groups of local staple crop and root-soil samples(50 for kiwi fruit,36 for rice,and 34 for corn).Agricultural crop samples were tested for seven indicators,including As,Cd,Cr,Cu,Hg,Pb,and Zn.Root soil samples were tested for 18 indicators,including pH,Mn,Se,As,Cd,Cr,Cu,Hg,Ni,Pb,Zn,and physicochemical properties.The test results were used to analyze the heavy metal contents of soil and crop seeds in the study area.Furthermore,the mi-gration and enrichment of Cd in the soil-crop system were examined through multiple linear regression and correlation analysis.The re-sults are as follows:(1)The study area is dominated by weakly acidic soil,with Cd content higher than the background value in Hu-nan Province.The high-value zones of Cr,Ni,and Cu are primarily distributed in the southwestern and southeastern portions of the study area.The Cd and pH in the soil show higher values in the west and lower values in the east;(2)In crop seeds,the three heavy metals with the highest enrichment coefficients are Cd,Zn,and Cu.The migration of Cd in the soil-crop system of the study area is principally influenced by soil pH and texture.A higher pH value and finer texture correspond to weaker migration of Cd.Additionally,Cd migration is affected to some extent by the contents of Mn,CaO,and total organic carbon in the soil.The relatively low heavy metal enrichment coefficient of kiwi fruit in the study area makes kiwi fruit suitable for production promotion.
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