Method for repairing Cd contaminated soil by intercropping herbs and swamp cabbage

A herbaceous plant and polluted soil technology, applied in the field of contaminated soil remediation, can solve the problems of unclear absorption and transport mechanism of heavy metals, affecting the efficiency of heavy metal polluted soil, slow growth, etc., and achieve obvious ecological benefits, fast growth, and high biomass high effect

Active Publication Date: 2018-11-16
BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the hyperaccumulator plants used in intercropping remediation technology generally have the disadvantages of slow growth, long cycle, small biomass, and specificity for the enrichment of heavy metals, which affect the efficiency of intercropping to remediate heavy metal-contaminated soils.
[0004] At present, there are few effective cases at home and abroad on the use of intercropping measures to implement bioremediation of Cd-contaminated soil in vegetable fields. not very clear

Method used

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  • Method for repairing Cd contaminated soil by intercropping herbs and swamp cabbage
  • Method for repairing Cd contaminated soil by intercropping herbs and swamp cabbage
  • Method for repairing Cd contaminated soil by intercropping herbs and swamp cabbage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1, crop and intercropping plant and vernalization

[0021] The main crop is Ipomoea aquatic forsk.

[0022] Intercropping herbs include: Sorghum bicolor L., Sudan grass (Sorghum sudanenseStapf), Pennisetum americanum x P, Ryegrass (Lolium perenne L.), Sonchus arvensis L. , chicory (Cichorium intybus L.), grain amaranth (Amaranthus hypochondriacus L.), clover (Trifolium repens L.), alfalfa (Medicago sativa L.), milk vetch (Astragalus sinicus L.).

[0023] The seeds were purchased from Beijing Hejia Ecological Technology Co., Ltd. and Jiangsu Yujingyuan Greening Engineering Co., Ltd., after 10% H 2 o 2 After the solution was disinfected for 10 minutes, it was washed several times with water, and the seeds were soaked in deionized water for 8 hours, then transferred to a petri dish to promote germination, and then sowed uniformly.

Embodiment 2

[0024] Embodiment 2, different herbaceous plants and water spinach intercropping test process

[0025] The experiment included 11 treatments: water spinach intercropping (CK), water spinach intercropping with sunflower grass (T1), water spinach intercropping with sudan grass (T2), water spinach intercropping with Pennisetum (T3), water spinach intercropping with ryegrass (T4 ), Intercropping of water spinach and bitter gourd (T5), intercropping of water spinach and chicory (T6), intercropping of water spinach and grain amaranth (T7), intercropping of water spinach and clover (T8), intercropping of water spinach and alfalfa (T9), intercropping of water spinach and Ziyun British intercropping (T10), 4 repetitions for each treatment. The pot experiment was carried out in a solar greenhouse. The test used a PVC long tank with a length, width and height of 60, 40 and 30 cm, respectively. Each pot was filled with about 36 kg of air-dried soil through a 2 mm sieve. .

[0026] As a c...

Embodiment 3

[0028] Embodiment 3, determination index and method

[0029] When harvesting, plant samples of water spinach and the aboveground parts (stems and leaves about 1 cm away from the soil surface) and roots of water spinach and each intercropping plant were taken, rinsed with tap water and deionized water, dried naturally at 105 ° C for 30 min, and then 70 Dry at ℃ to constant weight, and measure the dry weight of the aboveground part of the sample. The dried plant sample is pulverized with a pulverizer, mixed evenly, and passed through a 0.25mm sieve for later use. The Cd content of the soil sample is digested with HNO3-HClO4-HF, and the Cd content of the plant sample content using HNO 3 -HClO 4 Digestion, using ICP-MS to determine the content of cadmium in soil and plant digestion solution.

[0030] Cd reduction rate of crops (DRCd,%): Compared with the control (CK), the percentage of Cd reduction in the stems and leaves of water spinach in different intercropping treatments (%...

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Abstract

The invention discloses a method for repairing Cd contaminated soil by intercropping herbs and swamp cabbage. The method can repair Cd contaminated soil through intercropping agronomic measures. The method comprises: intercropping herbs and vegetables in Cd contaminated soil to be repaired, and carrying out normal cultivation management so that the Cd content in harvested vegetables and soil is reduced. The vegetables are swamp cabbages. The herbs are sorghum hybrid sudangrass, sudangrass, pennisetum, ryegrass, indian lettuce, chicory, amaranth, clover, alfalfa or astragalus sinicus. The invention provides the technical scheme for repairing Cd contaminated soil by agronomic measures of intercropping herbs in a swamp cabbage field. The intercropped herb has high biomass and a rapid growth rate, can enrich heavy metals such as Cd and can effectively reduce Cd content of the contaminated soil. The method can provide a basis for synchronous safe production and restoration in the Cd contaminated farmland. The method is environment-friendly and has obvious ecological, economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of contaminated soil remediation, in particular to a method for remediating Cd-contaminated soil by intercropping herbs and water spinach. Background technique [0002] Soil Cd pollution has not only caused serious economic losses to China's agricultural production, but also brought great risks to human health. It is of great practical significance to strengthen the research on the prevention and control of Cd pollution in farmland. At present, there have been a lot of researches on the remediation of heavy metal-contaminated soils at home and abroad, but looking at the existing remediation technologies, for China's large areas of moderately and slightly polluted soils, there are still many technical bottlenecks such as economic benefits and remediation time. Therefore, it is more suitable for China's national conditions and agricultural conditions to focus on the risk management and control of Cd pollution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
CPCB09C1/00B09C1/105B09C2101/00
Inventor 陈莉陈世宝王萌
Owner BEIJING ACADEMY OF AGRICULTURE & FORESTRY SCIENCES
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