模拟降雨条件下赤泥对土壤盐碱化的影响

发布时间：2018-06-01 00:30

本文选题：赤泥 + 土柱　；参考：《农业环境科学学报》2017年09期

【摘要】：为了解不同厚度赤泥在酸雨和雨水淋溶条件下对土壤盐碱化的影响,以山西某堆场赤泥为研究对象,采用土柱淋溶实验研究在模拟酸雨和雨水条件下,覆盖不同厚度赤泥对土壤pH、碱化度(ESP)以及电导率(EC)的影响。所用土壤为堆场附近背景土壤,其pH为8.68,有机质含量为25.66 g·kg-1,容重为1.20 g·cm-3,含水率为12.01%。结果表明:经淋溶后,土壤pH在表层0~10 cm深度显著升高,最大值达到10.18;在10~30 cm增加到8.67~9.12,与原始土壤相比升高较为明显;在30~60 cm深度没有明显变化。除覆盖5 cm厚赤泥经雨水淋溶组之外,其他实验组表层(0~10 cm)土壤ESP值均超过15.00%,土壤呈碱化状态;在10~40 cm深度土壤ESP增加到5.38%~14.70%范围,有碱化趋势,对40 cm以下深度土壤碱化影响较小。所有实验组中土壤EC值仅略有增加,对土壤盐化影响不明显。赤泥中钠、钾、镁、钙具有较强的迁移性,淋出液中最大浓度分别为125.86、2.23、57.13、209.07 mg·L-1,可能会对地下水造成潜在影响。在实验条件下,赤泥对土壤碱化影响较为明显,且碱化影响随覆盖赤泥厚度增加而增大,酸雨淋溶比雨水淋溶影响更为严重。
[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.
【作者单位】：上海大学环境与化学工程学院;中国环境科学研究院环境基准与风险评估国家重点实验室;北京师范大学水科学研究院;
【基金】：国家环境保护公益性行业科研专项(201509048)~~
【分类号】：S156.4

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