A system and method for controlling heavy metals in the effective state of rice rhizosphere

Abstract

The invention discloses a rice rhizosphere available heavy metal control system, comprising a rice field simulation device and a fine rice field water management device, wherein the rice field simulation device comprises a shell of which the upper end is opened and surface soil fed into the shell and used for planting rice, the surface soil is formed by collecting metal contaminated rice field soil layer by layer and backfilling the shell with the soil, the shell is filled with water till exceeding the surface of the surface soil to form overlying water, and a rhizosphere water collector as well as an Eh probe and a pH probe connected with rhizosphere Eh and pH monitoring equipment are inserted into the surface soil; and the fine rice field water management device comprises field Eh and pH supervision equipment and intelligent irrigation and drainage equipment connected with the field Eh and pH supervision equipment. The invention further provides a rice rhizosphere available heavy metal control method. The system and the method can reduce the blindness in field water management of current heavy metal contaminated rice fields, improve the scientificity of field water content management and gain maximum benefits of field water management for inhibiting rice from absorbing available heavy metals.

Description

technical field [0001] The invention relates to the fields of protection of cultivated land resources and treatment of heavy metal polluted soil, in particular to a system and method for controlling effective heavy metals in rice rhizosphere. Background technique [0002] According to the latest statistics from the Ministry of Land and Resources, more than 12% of the country's 1.826 billion mu of arable land is polluted by heavy metals such as cadmium, lead, arsenic, and mercury. The incident of cadmium rice in Hunan Province in 2013 was even more shocking at home and abroad. In addition to Hunan, there are rice cadmium exceeding the standard in Guangdong, Guangxi, Fujian, Zhejiang and other places in southern China, and the exceeding rate is about 5% to 15%. Long-term consumption of food with excessive heavy metals will seriously damage the human liver, kidneys and nervous system, threatening the lives and health of the people. 60% of my country's population takes rice as ...

AI Technical Summary

Problems solved by technology

Existing studies have shown that the relationship between water conditions in paddy fields and the content of available heavy metals in the rhizosphere is very complex and difficult to quantify; however, the relationship between the content of available heavy metals in the rhizosphere and soil Eh and pH is relatively clear and has a quantitative basis

Therefore, quantify the relationship between the content of available heavy metals in the rhizosphere and soil Eh and pH, and use the monitoring and regulation of soil Eh and pH to indirectly carry out fine management of water content in rice fields, minimize the content of available heavy metals in the rhizosphere, and reduce the impact on rice. The absorption and accumulation of effective heavy metals in the rhizosphere is very important, but there are few technical methods for reference

Images