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Method for repairing cadmium and zinc polluted farmland soil by use of weeds and capsella bursa-pastoris in farmland in winter

A planting method and farmland technology, applied in the restoration of polluted soil, etc., can solve the problems of insufficient plant variety resources, and achieve the effects of low cost, strong reproductive ability, and strong operability

Inactive Publication Date: 2014-02-05
朱雪梅
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the embodiments of the present invention is to provide a method for repairing cadmium-zinc-contaminated farmland soil by using weeds shepherd's purse in winter farmland, aiming to solve the problem of insufficient plant species resources for bioremediation of soil heavy metal pollution under low temperature conditions in winter

Method used

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  • Method for repairing cadmium and zinc polluted farmland soil by use of weeds and capsella bursa-pastoris in farmland in winter
  • Method for repairing cadmium and zinc polluted farmland soil by use of weeds and capsella bursa-pastoris in farmland in winter
  • Method for repairing cadmium and zinc polluted farmland soil by use of weeds and capsella bursa-pastoris in farmland in winter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0032] Embodiment result is as follows:

[0033] figure 2 It is the aboveground biomass of shepherd's purse under different Cd concentration treatment conditions. Significance analysis of the least significant difference method showed that in the treatment with Cd dosage concentration of 25mg / kg, compared with the control, there was no significant difference in aboveground biomass (0.01<P<0.05), showing strong tolerance . However, under higher Cd pollution treatment, that is, after the dosage concentration was greater than 50mg / kg, the aboveground biomass decreased (0.01<P<0.05), indicating that although the tolerance of shepherd's purse is strong, it still has a certain limit. After more than 50mg / kg, the growth of plants will be inhibited.

[0034] The results of Cd content determination in plants are shown in the following table 1:

[0035] Table 1. The enrichment characteristics of cadmium in shepherd's purse under different treatment concentrations

[0036]

[00...

Embodiment 2

[0038] Embodiment 2 The residential area simulation embodiment of heavy metal cadmium

[0039] This embodiment is the application of shepherd's purse in repairing soil heavy metal cadmium pollution:

[0040] This example was carried out at the farm of Ya'an Campus of Sichuan Agricultural University from November 2012 to January 2013, with an area of ​​8m 2 (L=4m, W=2m), the basic physical and chemical properties of the soil are the same as the potting soil. There are 3 plots in the example, the soil concentration is CK (no Cd added) and the added concentration is 25mg / kg (T1) and 50mg / kg (T2), and the added Cd form is CdCl 2 2.5H2 O, is an analytically pure reagent, added in a solid state. The planting method still adopts the transplanting method, and the shepherd's purse seedlings are transplanted to grow in the plot; after 45 days, the aerial parts of the plants are harvested with stubble, and the heavy metal cadmium content in the shepherd's purse is determined.

[0041]...

Embodiment 3

[0047] The pot plant concentration gradient embodiment of embodiment 3 heavy metal zinc

[0048] Present embodiment is the application of shepherd's purse in repairing soil heavy metal zinc pollution:

[0049] There are 6 treatments in the embodiment, which are respectively CK (dosing no Zn) and 5 different heavy metal concentration example areas, and the concentration is 300mg / kg (T1), 500mg / kg (T2), 1500mg / kg (T3), 2000mg / kg (T4), 2500mg / kg (T5), the form of heavy metal added is ZnSO 4 ·7H 2 O, is an analytically pure reagent, which is added to the soil in a solid state, mixed thoroughly, and balanced for four weeks before use.

[0050] This example was carried out at the farm of Ya'an Campus of Sichuan Agricultural University from November 2012 to January 2013, and the basic physical and chemical properties of the soil were the same as those in Examples 1 and 2. In the present embodiment, 2.0kg of soil is filled in every pot (pot diameter 20cm, height 20cm), and 5 seedli...

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Abstract

The invention discloses a method for repairing cadmium and zinc polluted farmland soil by the use of weeds and capsella bursa-pastoris in a farmland in winter. The method comprises the steps of planting seedlings of the capsella bursa-pastoris with two true leaves into cadmium and zinc (heavy metals) polluted farmland soil in winter and harvesting the overground part of the planted capsella bursa-pastoris regularly. In the method, the cold resistance and the co-accumulative characteristic of the capsella bursa-pastoris to cadmium and zinc heavy metals to absorb and accumulate the cadmium and zinc heavy metals in the polluted soil and transfer the heavy metals to the overground part, so as to reduce the contents of the cadmium and the zinc in the soil; after a certain biomass is accumulated in the overground part, the capsella bursa-pastoris without stubbles is harvested for extracting continuously, so that the purpose of reducing the contents of the cadmium and the zinc in the polluted soil is achieved; and besides, as the capsella bursa-pastoris has strong breeding capacity, grows rapidly, and can grow under an extremely severe soil condition, and the extensive management is applied during growth of the capsella bursa-pastoris, the method has the low cost and the strong operability and develops a new plant resource variety for repairing the heavy metal polluted soil.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal pollution in the environment, and in particular relates to a method for remediating cadmium-zinc-contaminated farmland soil by using farmland weeds shepherd's purse in winter. Background technique [0002] With the development of urbanization and industrialization, the soil has been seriously polluted by heavy metals, resulting in a decrease in soil quality. The area of ​​cultivated land polluted by heavy metals in my country has reached 20 million hectares, accounting for 1 / 6 of the total area of ​​cultivated land in the country, and heavy metals such as cadmium and zinc are particularly harmful to soil. [0003] Cadmium is a heavy metal pollutant with strong toxicity and wide range, which can remain in farmland for a long time and has a long half-life, while zinc is not only a plant micronutrient, but also an environmental pollution element. Due to the similar chemical proper...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 朱雪梅邵继荣刘英杰林立金杨占彪杨远祥金倩罗江
Owner 朱雪梅
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