Correlation analysis of Cd pollution in vegetables and soils and the soil pollution threshold

In order to get the relationship between mental pollution in soil and vegetables and support green vegetable production, five kinds of common foliage vegetables(Lettuce Plant, Schizonepeta Tenuifolia Briq, Lpomoea aquelica, lettuce, Amaranthus hypochondriacus) were taken as experimental materials to study the correlation between the polluted vegetables and the soil of different concentration of Cd cultivated in greenhouse. The soil pollution threshold values to produce the green vegetables were analyzed. The results showed that: the soil polluted in low concentration Cd could promote the growing of vegetables and improve the production of vegetables; The contents of Cd in five kinds of vegetables increased with the increase of the Cd concentration in soil. The Cd contents in the vegetables and the soil correlated obviously; the Cd threshold values in soil were (0.3199±0.0349)mg/kg for Lettuce Plant, (0.3335±0.01904)mg/kg for Schizonepeta Tenuifolia Briq, (0.1952±0.1072)mg/kg for Lpomoea aquelica, (0.1554±0.0064)mg/kg for Lettuce, (0.2690±0.0532)mg/kg for Amaranthus hypochondriacus; The order of the ability of concentrating Cd from the largest to the smallest was, Lettuce, Lpomoea aquelica, Amaranthus hypochondriacus , Lettuce Plant and Schizonepeta Tenuifolia Briq.