A method for repairing heavy metal cadmium polluted soil while producing
A technology for cadmium-contaminated soil and heavy metals, applied in the field of phytoremediation, can solve the problems of different adsorption of pollutants, affect crop growth, and take a long time, and achieve the effects of good popularization and application value, no secondary pollution, and low cost.
Active Publication Date: 2021-07-09
SOUTH CHINA AGRI UNIV
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Problems solved by technology
Therefore, for this kind of real polluted soil, it takes a long time to directly plant the existing enrichment plants, and it is of little significance to achieve the restoration effect. Strengthening measures must be taken to improve the efficiency of phytoremediation.
[0005] CN103109651A discloses a method for repairing cadmium-contaminated vegetable fields while producing. The selected high-accumulation crops are Solanum nigrum, and the ultra-low-accumulation crops are Japanese hardcore onion king. Habitat and different cultivation methods have different adsorption effects on pollutants, which greatly affect the growth of crops.
In addition, the current research and application of phytoremediation of heavy metals is mainly on dry land, not many wetlands and rice fields are involved. It is related to the use of plant and rice box-furrow intercropping systems to achieve biodiversity planting and increase ecological edge effects, and improve ecosystem productivity to achieve The academic research and practice of production-while-remediation of polluted paddy fields have not been reported yet
Method used
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Experimental program
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Embodiment 1
[0042] Example 1 A method of remediating heavy metal cadmium-contaminated rice field soil while producing
[0043] 1. A method for repairing heavy metal cadmium polluted paddy field soil while producing, comprising the following steps:
[0044] (1) Seedling management of low-cadmium-accumulating rice seedlings and super-accumulative plant Solanum nigrum seedlings: use improved varieties that meet the standards for low-accumulating cadmium varieties for rice, such as Zhuliangyou 189 or 819 varieties for early rice, and Zhuliangyou 189 or 819 for late rice. Xiangwan Indica 12 or C Liangyou 755 varieties, etc. After conventional or seedling tray seedling cultivation, seedlings suitable for transplanting are obtained, so that the seedling age is 15 to 20 days, and they are used for future use; less-flowered nightshade is propagated by seeds or seedlings, and conventional seedlings are raised Transplant planting methods for cultivation management, standby;
[0045] (2) Field finis...
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The invention discloses a method for repairing heavy metal cadmium-contaminated soil while producing, which comprises the following steps: arranging the cadmium-contaminated soil into a compartment surface, adopting the mode of compartment ditch controlled irrigation, and transplanting rice seedlings of low cadmium accumulation plants to Carriage ditch; before and / or after rice planting, plant cadmium hyperaccumulator plant Solanum nigrum on the car surface; after throwing rice seedlings to rice maturity, keep a thin water layer in the car ditch and the water depth is less than or equal to 5 cm. The soil layer 5-10 cm below the car surface should not be flooded; harvest nightshade and rice successively or at the same time; when harvesting nightshade, harvest the whole plant or leave the stubble on the ground part 2-5 cm high; centrally process the harvested nightshade Or carry out resource processing. The invention improves the ability of hyperaccumulator plants to absorb and enrich heavy metals, and at the same time reduces the amount of accumulated heavy metals in soil and rice, and realizes the effect of repairing polluted soil while producing safely, with high efficiency, easy operation, no secondary pollution, Low cost and other advantages.
Description
technical field [0001] The invention belongs to the technical field of phytoremediation in soil heavy metal restoration. Specifically, it relates to a method for repairing heavy metal cadmium-contaminated soil while producing; more specifically, it relates to an intercropping cultivation method suitable for low-accumulation rice-hyperaccumulative plant Solanum nigrum in cadmium-contaminated paddy fields and its application in paddy field soil pollution control in the application. Background technique [0002] In recent years, the harm caused by heavy metal pollution in my country has gradually emerged, and environmental risks have become increasingly prominent. Among heavy metal pollution, cadmium pollution is a prominent problem, especially soil cadmium pollution and cadmium rice have attracted much attention. According to relevant data, about one-sixth of my country's rice fields are polluted by arsenic and cadmium to varying degrees, and the polluted area is increasing ...
Claims
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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 黎华寿秦俊豪黎思慧麻庆广许杨贵
Owner SOUTH CHINA AGRI UNIV