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Method for restoring cadmium pollution soil in ecological mode through turfgrass

A technology for cadmium-contaminated soil and ecological restoration, which is applied in the field of ecological restoration of heavy metal-contaminated soil, can solve the problems of food safety and human health threats, restore the slow growth rate of plants, and be unsuitable for planting crops, etc. Benefits and environmental benefits, the effect of easy promotion and application

Inactive Publication Date: 2015-01-28
WUHAN BOTANICAL GARDEN CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] At present, there are some unsatisfactory aspects of phytoremediation technology, such as slow growth of repair plants, low biomass, and long repair time. Some repair plants are easy to bring heavy metals into the food chain, which is a potential threat to food safety and human health; Some special areas such as slopes in heavy metal polluted areas are not suitable for planting crops due to their own soil environment and terrain

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Plant cadmium-tolerant bermudagrass (BD242) in plastic pots with cadmium-free soil and spray with 1.5mM CdSO 4 (Constituted by 1 / 2 Hoagland nutrient solution) solution was poured until the soil cadmium concentration reached 120mg / kg, and cultivated under controlled conditions (30°C) for 2 months, during which the growth rate and lawn quality of bermudagrass were measured weekly. After the cultivation, the bermudagrass was taken out, the root was rinsed with tap water, and then rinsed with ultrapure water, and the moisture was absorbed with absorbent paper. The whole plant was divided into aerial part and underground part, weighed separately, then killed at 105°C, dried at 70°C to constant weight, and the cadmium content in the plant was determined by wet ashing method. Take the potting soil and measure the available cadmium content in the soil. It was found that the available cadmium content in the soil planted with bermudagrass was significantly lower than that of the...

Embodiment 2

[0049] Test time: May 2013; test location: Wuhan.

[0050] Take the cadmium-contaminated soil in Zhuzhou, Hunan (106.13mg / kg cadmium) and place it in a cement pool (length×width×height=2m×1m×1m), and press 0.49kg / m 2 The nitrogen content meter is mixed into the compound fertilizer (N:P:K=1:2:2). Sprinkle cadmium-resistant bermudagrass (BD242) grass stems (1:3) evenly on the surface, press the grass stems into the soil with wood chips, water enough, spray bermudagrass special herbicide sealant, and repeat four times. Carry out field management according to actual production, water regularly, and topdress. The results showed that the bermudagrass can grow into flats in 25-30 days. The analysis of cadmium content in bermudagrass showed that the cadmium content in the root was 540.22mg / kg, and the cadmium content in the aboveground stem and leaf was 113.52mg / kg and 63.81mg / kg respectively. Turf quality is 7.5 points (0-9 point scale).

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Abstract

The invention discloses a method for restoring cadmium pollution soil in an ecological mode through turfgrass, and relates to the technical field of heavy metal pollution soil ecological restoring. The method comprises the steps of (1) cadmium-resisting Bermuda grass screening, (2) ecological restoration of cadmium pollution soil and (3) maintenance and management. According to the method, the cadmium-resisting Bermuda grass screened through graded-concentration cadmium stress treatment is used for restoring the cadmium pollution soil in the ecological mode, the bare earth surface can be quickly covered, the ecological afforestation problem of cadmium pollution soil is effectively solved, the purpose of continuously extracting and removing cadmium in soil can be achieved through grass cutting, and the method is easy to popularize and apply, meets the afforestation requirement, effectively lowers cadmium face source pollution, and has good social benefits and environment benefits.

Description

technical field [0001] The invention relates to the technical field of ecological restoration of heavy metal polluted soil, in particular to a method for ecological restoration of cadmium polluted soil by using lawn grass. Background technique [0002] Cadmium is one of the most toxic heavy metal elements, which is extremely harmful. Our country has about 1.4×10 6 hm 2 Farmland has been polluted by cadmium to varying degrees, involving 25 regions in 11 provinces and cities, seriously affecting the sustainable use of farmland soil and water bodies and the safety of agricultural and livestock products. How to effectively control cadmium pollution and restore the ecological environment is an issue of great concern to the whole society. [0003] The main ways that soil cadmium pollution causes harm to the environment are as follows: ①The leaching of rainwater infiltrates downwards, which leads to groundwater pollution; ②The cadmium-contaminated soil is exposed and directly or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00
Inventor 傅金民罗宏基娄燕宏
Owner WUHAN BOTANICAL GARDEN CHINESE ACAD OF SCI
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