CN105885858A - Rhizosphere amendment used in acid heavy metal contaminated soil for preventing vegetables from absorbing cadmium and application of rhizosphere conditioner - Google Patents

Abstract

The invention discloses a rhizosphere amendment used in acid heavy metal contaminated soil for preventing vegetables from absorbing cadmium and an application of the rhizosphere amendment. The rhizosphere amendment is prepared from 30%-40% by mass of fermented cow dung and 60%-70% by mass of chlorite mineral powder, wherein the pH of the fermented cow dung is 7.5-9.5, and organic substances account for 45 wt.% or more; the pH of the chlorite mineral powder is 9-11, and the chlorite accounts for 30 wt.%-50 wt.%. The fermented cow dung as agricultural organic waste can increase soil nutrients and the content of the organic matters and has good promotion effect on plant growth; mineral powder of industrial waste tailings contains various clay minerals, and heavy metal can be passivated by a porous adsorption structure; the rhizosphere conditioner with the fermented cow dung and mineral powder mixed can play a coordinate role in promotion of plant growth and fixation of transferring of the heavy metal in soil when applied.

Description

Rhizosphere conditioner and the application thereof of cadmium is absorbed acid heavy metal contaminated soil resistance control vegetable

Technical field

The invention belongs to the resistance control restorative procedure in heavy metal cadmium farmland, be specifically related to a kind of in the resistance of acid heavy metal contaminated soil Control vegetable absorbs rhizosphere conditioner and the application thereof of cadmium.

Background technology

Heavy metal cadmium (Cd) has the strongest bio-toxicity, and its chemism in soil is strong, elimination of can not degrading, by food Thing chain enrichment and serious harm human health, since there are well-known Itai-itai diseases in nineteen fifty-five Japan's remarkable ability river, cadmium pollution I.e. cause the extensive concern of all circles of various countries.According to " whole nation Soil Pollution Investigation publication " of announcement in 2014, China pollutes Thing is based on inorganic pollution, and the some position exceeding standard rate of heavy metal cadmium is the highest, reaches 7%.Wherein, southern area is due to the heavy metal-polluted soil back of the body The factors such as scape value height, soil acidification, its pollution level is more so.Particularly recently, the detection of the many provinces with Hunan as representative occurred Rice cadmium exceed standard event, push cadmium pollution food-safety problem to the teeth of the storm especially.Crop heavy metal exceeds standard on the one hand shadow Ring food safety, be detrimental to health, on the other hand also affect farm produce sale outlet, have a strong impact on international trade competitiveness. Therefore, on Cd-polluted farmland, how to produce the grain of health, become the scientific research mission that China's researcher is duty-bound. Research shows, the absorption efficiency of different vegetable heavy metal cadmium is different, and the usual heavy metal cadmium of leaf vegetables has stronger richness Collection ability, thus easily heavy metals exceeding standard.

Along with the raising of the level of production, supervene the resource industrial or agricultural organic waste of enormous amount, such as plant husbandry Crops biomass castoff, the various feces of livestock and poultry of aquaculture, the bark of paper-making industry, secondary stock, remaining mine tailing etc. of digging up mine. But, extensive offal treatment mode not only could not realize garbage and effectively utilize, and causes great environmental pollution on the contrary. Containing the organic substance needed for a large amount of plant growings and mineral trace element in agriculture and industry waste, right after harmless treatment Crop growth has beneficial effect.Meanwhile, some agriculture and industry waste contains large amount of organic and clay mineral, has passivation The effect of heavy metal.Chinese invention patent (201310324576.9) has invented a kind of life utilizing cattle manure passivation heavy metal-polluted soil Organic fertilizer；Patent of invention (201110050130.2) then uses a kind of soil weight of porous adsorption structure invention of clay mineral Metal conditioner；At present, the report using agriculture and industry waste resource to carry out heavy-metal contaminated soil safe crops production is had no. Changing rejected material to useful resource and crop production safety are combined by this patent, are the Beneficials killed two birds with one stone.

Summary of the invention

Solve the technical problem that: the present invention is directed to Hunan heavy metal cadmium agricultural land soil, it is provided that one can hinder control vegetable and absorb The rhizosphere conditioner of heavy metal and application thereof, this conditioner is made up of agriculture and industry waste, while rehabilitating soil, has concurrently useless The feature that waste resource utilizes.The present invention can effectively reduce the heavy metal concentration of vegetable, is conducive at acid heavy metal Polluted Soil Earth produces the vegetable meeting state food safety criterion.

Technical scheme: a kind of rhizosphere conditioner absorbing cadmium acid heavy metal contaminated soil resistance control vegetable, by quality accounting 30～40% Fermentation cattle manure and quality accounting 60～the chlorite mineral powder composition of 70%, the pH 7.5-9.5 of described fermentation cattle manure, organic >= 45wt.%；Chlorite mineral powder, pH 9-11, chlorite accounting 30-50wt.%

Above-mentioned chlorite mine tailing mineral powder, pH 9.84, chlorite 41wt.%, Anhydrite 25wt.%, quartz 25wt.%, Fang Xie Stone 6wt.%, hydromica 3wt.%.

Above-mentioned fermentation cattle manure pH 8.37, organic matter >=45wt.%, moisture≤30wt.%.

Above-mentioned resistance control vegetable variety is water spinach.

Above-mentioned rhizosphere conditioner absorbs the application in cadmium in acid heavy metal contaminated soil resistance control water spinach.

Beneficial effect: agricultural organic waste fermentation cattle manure can improve soil nutrient and the content of organic matter, has plant growing Good facilitation；Trade waste mine tailing mineral powder contains multiple clay mineral, and porous adsorption structure can be heavy metal-passivated. Use the rhizosphere conditioner of both mixing, synergism can be played in terms of promoting plant growing and fixing soil heavy metal transhipment. On the one hand plant growing reduces heavy metal concentration by dilution effect；On the one hand, the clay mineral passivation to heavy metal-polluted soil, can Reduce heavy metal-polluted soil activity, reduce the heavy metal transhipment to plant.And both mixing are used down, not only reducing heavy metal suction Receive, the Nutrient Absorption improving plant, especially water spinach has also played synergistic function (Fig. 1, Fig. 2).Therefore, Application agriculture and industry waste carries out safe production estimation at heavy-metal contaminated soil, is the Beneficial killed two birds with one stone.

Accompanying drawing explanation

Fig. 1: rhizosphere conditioner affects schematic diagram to what water spinach the upperground part biomass and heavy metal cadmium absorbed.Comparison, plantation sky Heart dish；Process 1, plant water spinach+mine tailing mineral powder；Process 2, plant water spinach+fermentation cattle manure；Combined Treatment, plantation sky Heart dish+mine tailing mineral powder+fermentation cattle manure.

Fig. 2: rhizosphere conditioner affects schematic diagram to what soil pH and water spinach phosphorus absorbed.Comparison, plants water spinach；Process 1, Plantation water spinach+mine tailing mineral powder；Process 2, plant water spinach+fermentation cattle manure；Combined Treatment, plants water spinach+mine tailing mineral Powder+fermentation cattle manure.

Detailed description of the invention

Embodiment 1:

The present invention utilizes agricultural waste fermentation cattle manure (pH 8.37, organic matter >=45wt.%, moisture≤30wt.%) and Industry Waste Gurry mine tailing mineral powder (pH 9.84, chlorite 41wt.%, Anhydrite 25wt.%, quartz 25wt.%, calcite 6wt.%, Hydromica 3wt.%) as rhizosphere conditioner, select local extensively plantation and there is the great Ye class of higher Metal uptake activity Vegetable water spinach is as experimental subject.

Being experimental field heavy metal cadmium farmland, xiangtan, hunan province county dryland soil, its cadmium pollution concentration is 0.68mg/kg, super Cross country's two-stage ring border quality standard value (GB 15618-1995, < 0.3mg/kg).Its basic physical and chemical is pH 4.9.Draw It is divided into plantation community (2.0m × 4.0m) to carry out field experiment.

Experiment rhizosphere conditioner is agricultural organic waste fermentation cattle manure, and amount of application is 500 kgs/acre.By equal for rhizosphere conditioner Even it is sprinkled into soil, digs and it is uniformly mixed with soil.According to locality custom plantation in each community, field normal management, about Treat plant maturation, respectively results plant shoot and root after 2 months, focus on mensuration plant shoot Biomass and a huge sum of money Belong to concentration etc..Result shows (Fig. 1): applying fermentation cattle manure has bigger facilitation to water spinach growth, significantly improves hollow Dish the upperground part biomass (increases by 71.9%)；Fermentation cattle manure processes and has a significant impact water spinach heavy metal concentration, applies fermentation cattle After excrement, water spinach is reduced to 4.91mg/kg to the absorption concentration (in terms of dry weight) of heavy metal-polluted soil from original 8.06mg/kg (fresh weight is calculated as 0.344mg/kg), the range of decrease is 39%.

Experiment rhizosphere conditioner is industrial organic wastes mine tailing mineral powder, and amount of application is 1000 kgs/acre.Rhizosphere is nursed one's health Agent is uniformly sprinkled into soil, digs and it is uniformly mixed with soil.Being accustomed to planting vegetable according to locality in each community, field is normal Management, gathers in the crops plant shoot and root after plant maturation, concentrates and measure the index such as phytomass and heavy metal concentration. Result shows (Fig. 1): apply mine tailing mineral powder has certain facilitation (increasing by 17.5%) to the Biomass of water spinach；With this Meanwhile, mine tailing mineral powder processes certain reduction effect, under this process, water spinach heavy metal concentration to water spinach heavy metal concentration It is reduced to 7.572mg/kg (fresh weight is calculated as 0.53mg/kg)；Analyze this process further to soil pH and plant P acquisition Impact (Fig. 2), result shows, mine tailing mineral powder has more apparent raising effect to soil pH, from comparison 4.83 raising to 5.47, And individually apply mine tailing mineral powder and Phosphorus Absorption in Plants is had no significant effect.

Experiment rhizosphere conditioner is agriculture and industry waste fermentation cattle manure and mine tailing mineral powder mixture, and it is public that amount of application is respectively 500 Pound/acre and 1000 kgs/acre.Rhizosphere conditioner is uniformly sprinkled into soil, digs and it is uniformly mixed with soil.In each community It is accustomed to planting vegetable, field normal management according to locality, gathers in the crops after plant maturation, and measure phytomass and heavy metal is dense The indexs such as degree.Result shows (Fig. 1): mixing conditioner remarkably promotes water spinach growth (increasing by 107.7%), and significantly reduces Vegetable heavy metal concentration, fresh weight is reduced to 0.276mg/kg (range of decrease 51%) due to 0.564mg/kg, close to the food of national regulation Product safety criterion (GB 2762-2005, < 0.2mg/kg).Meanwhile, mixing conditioner significantly improves soil pH, and significantly Promote the water spinach absorption (Fig. 2) to soil phosphorus, by the 4.149g/m compareed²Improve to 8.614g/m²(add 107.6%).

To sum up result shows, fermentation cattle manure and the mixing of mine tailing mineral powder are used, and is that one can effectively hinder control in acid dryland soil Vegetable absorbs the rhizosphere conditioner of heavy metal cadmium.

Claims (5)

1. the rhizosphere conditioner of cadmium is absorbed acid heavy metal contaminated soil resistance control vegetable, it is characterized in that the chlorite mineral powder of the fermentation cattle manure by quality accounting 30 ~ 40% and quality accounting 60 ~ 70% forms, the pH 7.5-9.5, organic matter >=45 wt.% of described fermentation cattle manure；Chlorite mineral powder, pH 9-11, chlorite accounting 30-50wt.%.

2. according to the rhizosphere conditioner absorbing cadmium described in claim 1 acid heavy metal contaminated soil resistance control vegetable, it is characterised in that described chlorite mine tailing mineral powder, pH 9.84, chlorite 41 wt.%, Anhydrite 25 wt.%, quartzy 25 wt.%, calcite 6 wt.%, hydromica 3 wt.%.

3. according to the rhizosphere conditioner absorbing cadmium described in claim 1 acid heavy metal contaminated soil resistance control vegetable, it is characterised in that described fermentation cattle manure pH 8.37, organic matter >=45 wt.%, moisture≤30 wt.%.

4. according to the arbitrary described rhizosphere conditioner absorbing cadmium acid heavy metal contaminated soil resistance control vegetable of claim 1 ~ 3, it is characterised in that the vegetable variety of resistance control is water spinach.

5. the arbitrary described rhizosphere conditioner of claim 1 ~ 3 absorbs the application in cadmium in acid heavy metal contaminated soil resistance control water spinach.