石灰及配合施用镁和硅对土壤pH和镉有效性的影响
发布时间：2018-08-13 18:55
【摘要】：【目的】为了研究在低浓度镉污染土壤上,施用不同量石灰以及石灰与镁、硅配合施用对土壤pH和镉有效性的影响,寻求降低土壤中镉生物有效性或毒性的有效实用技术措施。【方法】本研究分室内小量土壤(10g)培养试验和模拟田间的较大量土壤(1.5kg)网室培养试验,试验设置对照、4个石灰用量、4个石灰用量加镁和4个石灰用量加硅,共13个处理6次重复,淹水培养60d(室内)和120d(网室)并定期测定土壤pH和有效镉的变化规律。【结果】淹水后所有处理的土壤pH都随培养时间的延长而向中性趋近,初始pH越高的处理其最终pH降幅也越大。土壤有效镉含量的变化与土壤pH呈负相关。所有处理土壤有效的含量都低于或显著低于对照,不同物料和组合对土壤有效镉含量的降低效果依次为石灰+Si石灰+Mg石灰,高量石灰处理明显优于低量石灰处理,石灰配施镁或硅能进一步降低土壤中镉的有效性。【结论】施用石灰能有效降低土壤镉的有效性,在石灰的基础上配合施用硅或镁的效果更佳。
[Abstract]:[objective] to study the effects of different amounts of lime and lime combined with magnesium and silicon on soil pH and cadmium availability in soils contaminated with low concentration of cadmium. To seek effective and practical measures to reduce the bioavailability or toxicity of cadmium in soil. [methods] the experiment was conducted in laboratory with small amount of soil (10 g) and simulated in a large amount of soil (1.5kg) net culture. In the experiment, 4 lime, 4 lime and 4 lime were added with silicon, and 13 treatments were repeated for 6 times. 60 days (indoor) and 120 days (net room) of submerged culture, and the variation of soil pH and available cadmium were measured regularly. [results] the pH values of all treatments after flooding tended to be neutral with the extension of incubation time. The higher the initial pH, the larger the final pH decrease. There was a negative correlation between soil available cadmium content and soil pH. The available content of soil in all treatments was lower than or significantly lower than that of the control. The decreasing effect of different materials and combinations on soil available cadmium content was in order of lime, Si lime, mg lime, and high lime treatment was obviously superior to low volume lime treatment. [conclusion] Lime application can effectively reduce the availability of soil cadmium, and the combination of Si and mg on the basis of lime is better.
【作者单位】： 四川省农业科学院土壤肥料研究所;四川省屏山县组织部;彭州市农村发展局;
【基金】：四川省科技科技支撑计划项目(2014NZ008;2015NZ0108)
【分类号】：S153;X53
本文编号：2181878
[Abstract]:[objective] to study the effects of different amounts of lime and lime combined with magnesium and silicon on soil pH and cadmium availability in soils contaminated with low concentration of cadmium. To seek effective and practical measures to reduce the bioavailability or toxicity of cadmium in soil. [methods] the experiment was conducted in laboratory with small amount of soil (10 g) and simulated in a large amount of soil (1.5kg) net culture. In the experiment, 4 lime, 4 lime and 4 lime were added with silicon, and 13 treatments were repeated for 6 times. 60 days (indoor) and 120 days (net room) of submerged culture, and the variation of soil pH and available cadmium were measured regularly. [results] the pH values of all treatments after flooding tended to be neutral with the extension of incubation time. The higher the initial pH, the larger the final pH decrease. There was a negative correlation between soil available cadmium content and soil pH. The available content of soil in all treatments was lower than or significantly lower than that of the control. The decreasing effect of different materials and combinations on soil available cadmium content was in order of lime, Si lime, mg lime, and high lime treatment was obviously superior to low volume lime treatment. [conclusion] Lime application can effectively reduce the availability of soil cadmium, and the combination of Si and mg on the basis of lime is better.
【作者单位】： 四川省农业科学院土壤肥料研究所;四川省屏山县组织部;彭州市农村发展局;
【基金】：四川省科技科技支撑计划项目(2014NZ008;2015NZ0108)
【分类号】：S153;X53
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