Abstract
Through pot experiments, the changes of soil total nitrogen, available potassium, available phosphorus, organic matter, and pH, and the contents of heavy metals in the tested soils before and after planting were analyzed. The result showed that: Compared to before planting, the soil total nitrogen, organic matter, available phosphorus, and available potassium decreased in turn. The total nitrogen decline of soybean soil was the largest, and the organic matter decline of tomato soil was the largest. The decrease of soil Cd and Cr is obvious, Pb is the second, and the decrease of other heavy metals is less than 10%. The overall decline in heavy metals in tomato soil was the largest, followed by clover, and soybean the smallest. Correlation analysis showed that soil total nitrogen and organic matter were significantly positively correlated with Cd, and available potassium was significantly positively correlated with Cr. Increasing soil nutrient content can promote the effect of plants on soil heavy metal remediation.
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