Plant-microorganism combined remediation method for moderate and mild lindane-cadmium combined polluted farmland

Abstract

The invention relates to a plant-microorganism combined remediation method for a moderate and mild lindane-cadmium combined polluted farmland. Cadmium hyperaccumulators and crops are planted on polluted soil, a compound fertilizer and a biochar base fertilizer are applied, the carbon-nitrogen ratio of the soil is regulated while the pH value of the soil is reduced by using the biochar base fertilizer, the absorption of the hyperaccumulators to pollutants isenhanced while the biomass of the hyperaccumulators is improved, the growth of the hyperaccumulators is not influenced by concentration aggregation of the pollutants, pseudomonas and arbuscular mycorrhizal fungi are prepared into a mixed microbial inoculum, and the resistance of the hyperaccumulators is improved; and economic crops with root systems deeper than those of the hyperaccumulators and the hyperaccumulators are selected for intercropping/relay intercropping, the soil fertility is improved, the growth environment of the hyperaccumulators is adjusted, the remediation efficiency of the hyperaccumulators on lindane and cadmium is further enhanced, and the purpose of remediation while production is achieved.

Description

technical field [0001] The invention relates to the technical field of restoration of polluted soil, in particular to a plant-microbial combined restoration method for moderately mild lindane-cadmium compound polluted farmland. Background technique [0002] Soil is a resource that human beings depend on for survival. Especially in the process of agricultural production, the quality of soil environment directly affects the quality of agricultural development, and even endangers the health and safety of humans and crops. [0003] From the perspective of soil use types, the rate of pollutants in cultivated land exceeding the standard is very high, mainly inorganic pollutants, followed by organic pollutants; heavy metal cadmium is the most serious inorganic pollutant, and organic pollutants are mainly HCH, DDT and polysaccharides. Cycloaromatic hydrocarbons, including lindane in 666, are chemically stable and difficult to biodegrade. They remain in the environment for a longer t...

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Problems solved by technology

[0006] Pesticide pollution in phytoremediation soil is mainly carried out through three mechanisms: direct absorption / degradation, degradation by releasing enzymes, and joint mineralization of rhizosphere microorganisms (Zhu Yalan. Research progress in phytoremediation of soil pesticide pollution[J]. Anhui Agricultural Science , 2010(14):324-326+334); Chinese invention patent CN201910584367.5 also proposes a method for in-situ remediation of combined pollution of cadmium and atrazine in vegetable soil, for the combined pollution of cadmium and polycyclic aromatic hydrocarbons There are also related researches on remediation technology (Wang Kai. Strengthening effect and mechanism of phytoremediation of cadmium-PAH compound polluted soil [D]. Zhejiang University, 2012), but there are not many studies on remediation technology of lindane and cadmium compound polluted soil , especially while reducing pollutants, research on ensuring the health and safety of agricultural products is rarely reported

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