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首页> 外文期刊>Geoderma: An International Journal of Soil Science >Extensive reclamation of saline-sodic soils with flue gas desulfurization gypsum on the Songnen Plain, Northeast China
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Extensive reclamation of saline-sodic soils with flue gas desulfurization gypsum on the Songnen Plain, Northeast China

机译：潘南平原烟气脱硫石膏的广泛回收盐水脱硫石膏，东北

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Previous studies have reported that flue gas desulfurization (FGD) gypsum can be used as an amendment for saline-alkali soils. However, little information is available regarding the effects of FGD gypsum on soil quality and crop production at large scales. Thus, we evaluated the changes in the soil salinity, sodicity, soluble ion levels, paddy rice (Oryza saliva L.) yield and heavy metal levels in soil and rice after reclamation with FGD gypsum and paddy planting over three years. Data (90 samples) were also collected from three neighbouring saline-sodic fields (1780 ha). As expected, soil salinity and sodicity decreased significantly after two years of reclamation. The levels of electrical conductivity (EC) and the sodium absorption ratio (SAR) decreased rapidly in the first year, and the pH and exchangeable sodium percentage (ESP) decreased substantially in the second year. Averaged across the experimental sites, the mean EC, pH, ESP and SAR levels of the soils two years after reclamation decreased by 38.6%, 14.6%, 61.2% and 87.8%, respectively, compared to those of the initial soils. In addition, the concentrations of water-soluble Na+ and CO32- + HCO3- were 97.5% and 96.8% lower, respectively, two years after reclamation than the concentrations before reclamation. The paddy rice yield increased over time with reclamation; the mean level in the second year was 7.4 t ha(-1) or 80% of the yield harvested from the managed fields of neighbouring farmers. Moreover, the heavy metal (Cd, Cr, Hg, Pb and As) contents of both soils and rice were lower than the established standards and below detectable limits after FGD gypsum application. These results confirm that FGD gypsum is a safe and effective way to reclaim saline-sodic soils and worthy of widespread application on the Songnen Plain in Northeast China and in similar ecological areas.
机译：以前的研究报道，烟道气脱硫（FGD）石膏可以用作盐碱土壤的修正。但是，对于FGD石膏对土壤质量和大型作物生产的影响，提供了很少的信息。因此，我们评估了在三年内与FGD石膏和稻草种植后土壤和水稻中土壤盐度，素质，可溶性离子水平，水稻（Oryza Saliva L.）产量和重金属水平的变化。还从三个相邻的盐水 - 碳粉（1780公顷）收集数据（90样品）。正如预期的那样，两年后，土壤盐度和融入性明显减少。导电性（EC）和钠吸收率（SAR）在第一年迅速下降，PH和可交换的钠百分比（ESP）在第二年的基本下降。与初始土壤相比，在初始土壤中，平均在实验部位平均，土壤两年的平均EC，PH，ESP和SAR水平分别减少了38.6％，14.6％，61.2％和87.8％。此外，水溶性Na +和CO32- + HCO3的浓度分别在填海前两年后的97.5％和96.8％。水稻产量随着时间的推移而增加;第二年的平均水平为7.4吨（-1）或邻近农民管理领域收获的产量的80％。此外，土壤和水稻的重金属（CD，Cr，Hg，Pb和As）含量低于已建立的标准和低于FGD石膏施用后的可检测限制。这些结果证实，FGD石膏是一种安全有效的方法，可以在东北地区和类似生态地区的宋嫩平原上进行广泛应用的安全有效。

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