本文選題：赤泥 + 土柱��； 參考：《農(nóng)業(yè)環(huán)境科學(xué)學(xué)報》2017年09期

【摘要】：為了解不同厚度赤泥在酸雨和雨水淋溶條件下對土壤鹽堿化的影響,以山西某堆場赤泥為研究對象,采用土柱淋溶實驗研究在模擬酸雨和雨水條件下,覆蓋不同厚度赤泥對土壤pH、堿化度(ESP)以及電導(dǎo)率(EC)的影響。所用土壤為堆場附近背景土壤,其pH為8.68,有機質(zhì)含量為25.66 g·kg-1,容重為1.20 g·cm-3,含水率為12.01%。結(jié)果表明:經(jīng)淋溶后,土壤pH在表層0~10 cm深度顯著升高,最大值達到10.18;在10~30 cm增加到8.67~9.12,與原始土壤相比升高較為明顯;在30~60 cm深度沒有明顯變化。除覆蓋5 cm厚赤泥經(jīng)雨水淋溶組之外,其他實驗組表層(0~10 cm)土壤ESP值均超過15.00%,土壤呈堿化狀態(tài);在10~40 cm深度土壤ESP增加到5.38%~14.70%范圍,有堿化趨勢,對40 cm以下深度土壤堿化影響較小。所有實驗組中土壤EC值僅略有增加,對土壤鹽化影響不明顯。赤泥中鈉、鉀、鎂、鈣具有較強的遷移性,淋出液中最大濃度分別為125.86、2.23、57.13、209.07 mg·L-1,可能會對地下水造成潛在影響。在實驗條件下,赤泥對土壤堿化影響較為明顯,且堿化影響隨覆蓋赤泥厚度增加而增大,酸雨淋溶比雨水淋溶影響更為嚴(yán)重。
[Abstract]:In order to understand the effect of different thickness red mud on soil salinization under acid rain and Rain Water leaching conditions, the red mud of a pile yard in Shanxi Province was studied by using soil column leaching experiment under simulated acid rain and Rain Water conditions. Effects of covering different thickness of red mud on pH, alkalinity and conductivity of soil. The soil used is the background soil near the yard, its pH is 8.68, the content of organic matter is 25.66 g / kg ~ (-1), the bulk density is 1.20 g / cm ~ (-3), and the moisture content is 12.01%. The results showed that after leaching, the soil pH increased significantly at the depth of 0 ~ 10 cm on the surface layer, reached the maximum value of 10.18, increased to 8.67 ~ 9.12 at 10 ~ 30 cm, which was more obvious than that of the original soil, but had no obvious change at the depth of 30 ~ 60 cm. Except for the 5 cm thick red mud covered by Rain Water leaching group, the ESP values of the other experimental groups were above 15.00 cm. The soil was alkalized, and the soil ESP increased to 5.38% 14.70% at the depth of 1040 cm, which showed a trend of alkalization. It had little effect on soil alkalization below 40 cm depth. In all experimental groups, the EC value of soil increased only slightly, but had no obvious effect on soil salinization. Sodium, potassium, magnesium and calcium in red mud have strong migration. The maximum concentration of sodium, potassium, magnesium and calcium in leachate is 125.86% 2.232.237.13209.07 mg / L, respectively, which may have a potential effect on groundwater. Under the experimental conditions, the effect of red mud on soil alkalinity was obvious, and the alkalization effect increased with the increase of the thickness of covered red mud. Acid rain leaching was more serious than Rain Water leaching.
【作者單位】： 上海大學(xué)環(huán)境與化學(xué)工程學(xué)院;中國環(huán)境科學(xué)研究院環(huán)境基準(zhǔn)與風(fēng)險評估國家重點實驗室;北京師范大學(xué)水科學(xué)研究院;
【基金】：國家環(huán)境保護公益性行業(yè)科研專項(201509048)~~
【分類號】：S156.4

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