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EnglishToxic metals contamination of soil has become a serious problem in recent years. In this study, Chinese cabbage (a relatively high-accumulator of cadmium (Cd)) and cabbage (a relatively low-accumulator of Cd) were cultured in monoculture and in intercropping in the Cd-contaminated soil, to evaluate the effect of intercropping on the alteration of Cd extraction. Both the pot experiments and field experiments indicated that intercropping increased the Cd extraction by Chinese cabbage and decreased the Cd extraction by cabbage. Thus, Cd extraction was advanced while safe production was obtained. Further pot experiment was conducted to investigate the alterations of soil Cd fractions, soil pH, and soil enzyme activities to reveal their possible relationship with Cd extraction between different planting patterns. Results revealed that three individual Chinese cabbages in one intercropping pot played the same effect on alteration of these factors as six individual Chinese cabbages in one monoculture pot. The intercropping increased Cd extraction by Chinese cabbage and decreased Cd extraction by cabbage, probably by influencing mechanisms such as soil enzyme activities (especially the urease activity) in the cultivation system. Effect of intercropping on Cd accumulation is an important issue in cultivation of vegetables in potentially contaminated land. portuguesA contaminacao do solo por metais toxicos tornou-se um problema grave nos ultimos anos. Neste estudo, dois tipos de repolhos, o repolho chines (maior acumulador de cadmio (Cd)) e o repolho comum (menor acumulador de Cd) foram cultivados em monocultivo e em consorcio, em solo contaminado com esse metal, para avaliar o efeito do consorcio na extracao de Cd do solo. Os experimentos em vasos de campo indicaram que o consorcio aumentou a extracao desse metal pelo repolho chines e diminuiu a extracao pelo repolho comum. Assim, aumentou a extracao de Cd do solo, proporcionando seguranca alimentar. Outro experimento em vaso foi conduzido para investigar as alteracoes das fracoes de Cd do solo, o pH do solo e atividades enzimaticas do solo, para revelar possiveis efeitos na extracao desse metal entre os sistemas de plantio. Os resultados do experimento em vaso revelaram que tres repolhos da china, em cultivo consorciado, proporcionaram o mesmo efeito nessas variaveis, que os observados com seis plantas desse tipo de repolho, em monocultura. O consorcio influenciou as fracoes de Cd do solo devido a maior influencia das hortalicas no pH do solo e nas atividades enzimaticas (especialmente a urease), resultando maior extracao de Cd pelo repolho chines e menor pelo repolho comum.

Soil cadmium extraction in Chinese cabbage and cabbage intercropping