【摘要】：土壤中Cd污染問題日益嚴(yán)峻,嚴(yán)重影響了人類生活。因此對(duì)Cd污染土壤的修復(fù)研究已然成為熱點(diǎn)之一。本研究采用盆栽試驗(yàn),將植物修復(fù)技術(shù)與電動(dòng)修復(fù)技術(shù)相結(jié)合,通過不同電壓梯度、通電時(shí)間、電場(chǎng)方向、施用添加劑等因素探究了直流電場(chǎng)-東南景天聯(lián)合修復(fù)Cd污染土壤的最優(yōu)條件與效果。主要結(jié)果如下:(1)在試驗(yàn)條件下直流電場(chǎng)對(duì)東南景天生長具有促進(jìn)作用,在電壓梯度為1.0 V/cm及通電時(shí)間6 h/d處理下的東南景天生物量最高,交換電場(chǎng)方向?qū)|南景天生物量影響較小。并且在兩類不同土壤中的東南景天生物量相近。(2)直流電場(chǎng)作用下,東南景天地上部Cd吸收量有顯著增加。其中電壓梯度為1.0 V/cm,通電時(shí)間6 h/d,電場(chǎng)方向兩天交換處理下的東南景天Cd吸收量最高,達(dá)到90.6μg/株。而在不交換電場(chǎng)方向下,東南景天Cd吸收量有所降低。在兩類供試土壤中,當(dāng)在無電場(chǎng)作用下,東南景天Cd吸收量無差異;而在直流電場(chǎng)作用下,Cd輕度污染的溫州土中的東南景天Cd吸收量顯著高于Cd重度污染的富陽土中的東南景天Cd吸收量。(3)在不同添加劑(EDTA、腐殖酸、有機(jī)肥)與電場(chǎng)聯(lián)合作用對(duì)東南景天吸收Cd的作用不同。EDTA作為添加劑,對(duì)土壤Cd有效性提升58.35%,并且強(qiáng)化了東南景天吸收土壤Cd的能力。當(dāng)施加電場(chǎng)與EDTA共同作用時(shí),東南景天Cd吸收效果優(yōu)于不施加電場(chǎng)處理下,單株東南景天Cd吸收量分別為56.9μg/株(不施加電場(chǎng))、69.0μg/株(施加電場(chǎng))。腐殖酸作為添加劑的處理中,土壤中Cd有效態(tài)含量略有提升,并且東南景天Cd吸收量顯著提升,單株東南景天Cd吸收量分別為68.6μg/株(施加電場(chǎng))、48.1μg/株(不施加電場(chǎng)),但東南景天生物量受腐殖酸抑制低于對(duì)照(無添加劑)處理。有機(jī)肥作為添加劑的處理中,東南景天生物量顯著提高,但對(duì)土壤中Cd有效性并無提升作用。但是施加電場(chǎng)與有機(jī)肥共同處理下的東南景天Cd吸收量與不施加電場(chǎng)處理間無顯著差異。
[Abstract]:The problem of Cd pollution in the soil is becoming more and more serious, and the human life is seriously affected. Therefore, the research on the remediation of Cd-contaminated soil has become one of the hot spots. In this study, a pot experiment was used to combine the plant repair technology with the electric restoration technology, and the optimum conditions and effects of the combined repair of Cd-contaminated soil by DC-SE-SE were investigated by means of different voltage gradient, power-on time, direction of electric field, application of additive and so on. The main results are as follows: (1) Under the condition of the test, the DC field has a catalytic effect on the growth of the southeast, and the biomass of the southeast is the highest under the treatment of the voltage gradient of 1.0 V/ cm and the power-on time of 6 h/ d, and the direction of the exchange electric field is less influenced by the biomass of the southeast. and the biomass in the southeast of the two types of different soil is similar. (2) The Cd absorption in the upper part of the southeast view is significantly increased under the action of the direct current field. in which the voltage gradient is 1.0 V/ cm, the power-on time is 6 h/ d, and the absorption of Cd in the south-east region under the two-day exchange treatment in the electric field direction is the highest, reaching the 90-6.mu. g/ strain. In the direction of non-exchange of electric field, the absorption of Cd in the southeast is reduced. In the two types of test soil, the absorption of Cd in the south-east was not different under the action of no electric field, and the amount of Cd in the south-east of the Wenzhou soil which was slightly polluted by Cd was significantly higher than that of the Cd in the south-east of the heavy-polluted soil. (3) The effect of combination of different additives (EDTA, humic acid, organic fertilizer) and electric field on the absorption of Cd in the southeast is different. As an additive, the efficiency of Cd in the soil was increased by 58. 35%, and the ability of the soil Cd to be absorbed in the southeast was enhanced. When the electric field was applied to the EDTA, the Cd absorption in the southeast was superior to that of the non-applied electric field, and the Cd absorption in the southeast of the single plant was 569.mu. g/ strain (no electric field applied), and 69.0. m u.g/ strain (applied electric field). In the treatment of the humic acid as an additive, the content of Cd in the soil increased slightly, and the amount of Cd in the southeast was significantly increased, and the Cd absorption in the southeast of the plant was 68. 6. mu. g/ strain (applied electric field), and 48. 1. m but the biomass in the southeast is controlled by the humic acid to be lower than that of the control (no additive). In the treatment of the organic fertilizer as an additive, the biomass of the southeast plant is obviously improved, but the efficiency of the Cd in the soil is not promoted. However, there was no significant difference between the absorption of Cd in the southeast and the treatment of the non-applied electric field under the co-treatment of the electric field and the organic fertilizer.
【學(xué)位授予單位】：浙江農(nóng)林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X53

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