Method for restoring and using vegetable field soil combinedly polluted by cadmium and polycyclic aromatic hydrocarbon

Abstract

The invention relates to technology for synchronous restoration and production of vegetable field soil combinedly polluted by cadmium and polycyclic aromatic hydrocarbon. The technology comprises the following steps of: 1) planting cadmium hyperaccumulator solanum nigrum L in the vegetable field which is combinedly polluted by the cadmium and the polycyclic aromatic hydrocarbon in spring in a mode of furrow drilling and row planting, harvesting the solanum nigrum L when the solanum nigrum L grows for 63 to 67 days and bears fruits, and applying glycine, glutamic acid and cysteine about one month before the solanum nigrum L is harvested; 2) pulling the solanum nigrum L with roots out after the solanum nigrum L is harvested, and then planting cadmium low accumulation cabbage navy camps 91-12, wherein the row space and the plant space are 50cm respectively; harvesting the cabbage after the cabbage grows for about 80 days; and completing the steps in a restoring and using cycle. By the technology, a great amount of cadmium is taken away from the soil combinedly polluted by the cadmium and polycyclic aromatic hydrocarbon by using the hyperaccumulator, the polycyclic aromatic hydrocarbon in the soil is obviously reduced, the cabbages meeting Chinese health standards can be produced, and the polluted soil can be safely used when the polluted soil is restored.

Description

technical field [0001] The invention relates to a method for phytoremediation and agricultural safety of cadmium-polycyclic aromatic hydrocarbon compound polluted vegetable field soil, in particular to a method for repairing cadmium and polycyclic aromatic hydrocarbon compound polluted vegetable field soil at the same time by utilizing the super-enrichment restoration plant Solanum nigrum , can also produce Chinese cabbage with low cadmium content, that is, the cadmium content of Chinese cabbage meets the national pollution-free vegetable standard. Background technique [0002] According to the 1997 Bulletin on the State of the Environment in my country, there are more than 10 million hm of arable land in my country 2 Subject to different degrees of re-pollution, its area accounts for about 7.34% of the cultivated land area in that year. 300,000 hm across the country in 2000 2 The sampling survey of harmful heavy metals in the soil of basic farmland protection areas showed...

AI Technical Summary

Problems solved by technology

However, looking at the various remediation methods of farmland polluted soil, although phytoremediation shows a bright prospect, as far as my country's national conditions are concerned, these heavy metal-contaminated soils are taken out for remediation or discarded or all of them are used for other purposes. food production is unrealistic

A better way is to use hyperaccumulator plants to remediate polluted soil, and at the same time to plant low-accumulative crops in an appropriate way, which can not only improve the quality of polluted soil, but also ensure food safety. "Technology undoubtedly has more practical significance, and the resulting ecological and social benefits are immeasurable