Determination of Soil Cadmium Safety Thresholds for Food Production in a Rice-Crayfish Coculture System.

The Cd concentration in each tissue of rice showed significant ( p < 0.05) or extremely significant ( p < 0.01) positive correlation with soil total Cd and soil available Cd content, and the correlation coefficient was between 0.36 and 0.92; it was extremely significant with total Cd in water ( p < 0.01), and the correlation coefficient was between 0.31 and 0.83, but there was no significant correlation with dissolved Cd in water.

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The Cd concentration in the gut showed an increasing trend from 0 d to 22 d, and then remained relatively stable until the end of the experiment (except that the T4 treatment continued to increase slowly) ( Figure 4 b).

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