Method for reducing coexist crop Pb accumulation

Abstract

The invention provides a method of reducing lead accumulation of coexisting crops, which is to plant seeds of erect-straw cereal and wild legumes together in the lead polluted soil and irrigate water irregularly to keep the water content of the soil to be about 80%. When the planted erect-straw cereal is mature and harvested, the wild legumes can also be got. The wild legumes can be removed from the soil wholly so as to realize the purposes of getting safe products on the lead polluted soil and gradually removing the heavy metal lead. The invention fixes the lead in roots and plants by the great root system of the legumes, reduces the activity and concentration of lead in the rhizosphere of plants and reduces lead that enters and runs into seeds of erect-straw crops. The invention is reasonable in design, low in cost and strong in operability, which can be applied in removing the metal lead from crops that grow in the lead polluted soil.

Description

technical field [0001] The invention relates to the phytoremediation technology of polluted environment, in particular, it is a method for reducing the absorption and accumulation of lead by crops to achieve safe production of crops by using a leguminous plant corngrass (Kummerowia striata Schindl.). Background technique [0002] The phytoremediation technology developed by using the characteristics of plants to absorb, transform, fix and activate soil heavy metals has always been an important aspect of the research on soil heavy metal pollution remediation technology. From the perspective of phytoremediation, the phytoremediation technologies that have been developed mainly include root filtration technology, plant extraction technology, plant stabilization technology and plant volatilization technology. Among them, the technology of extracting soil heavy metal elements by overabsorbing excessively accumulating plants has attracted special attention. Since Brooks proposed ...

AI Technical Summary

Problems solved by technology

[0003] However, in many cases, due to their slow growth and low biomass, the repair effect of hyperaccumulator plants is not ideal in the short term. Therefore, the development of biological control technologies to reduce the accumulation of heavy metals in the edible parts of crops uses the opposite of hyperaccumulator plants. Plants that reject heavy metals (low-accumulation plants) or establish planting systems that reduce crop uptake and accumulation of heavy metals in the soil, the mode of safe production of crop products on polluted soils has received increasing attention (Andrei et al., 2003; Khan , 2005; Arao and Ishikawa, 2006; Wu et al., 2007), especially for large areas of low and moderately polluted farmland, if heavy metals cannot be effectively removed from the soil in a short period of time, by excavating the crops themselves Selecting crop varieties with low absorption and low accumulation of pollutants and exerting the interaction between plants to filter and shield pollutants will be an important way to establish a safe production system for crop products (Zhu Yongguan et al., 2006)