有机-无机复合改良剂对滨海盐碱地的改良效应研究

发布时间：2019-06-10 23:20

【摘要】：针对河北中捷农场滨海盐碱地所具有的盐碱化程度高、单盐毒害突出的特点,选取园林废弃物堆肥和惰化产品,并结合磷石膏对该地区的土壤进行改良研究。以大田条件下的实际应用为基础,设置不同处理,进行田间对比试验,定期取样,对土壤盐分指标进行测定分析。结果表明:1)施入有机改良剂和磷石膏,既能有效降低土壤pH值,又能避免单独施入磷石膏后,土壤pH值变化过大,对植物产生不利影响。2)从单因素试验分析,土壤的SAR随着有机改良剂和磷石膏施入量的提高而显著降低,磷石膏的改良效果优于有机改良剂;从2种改良剂的交互作用来看,有机-无机改良剂配施的效果优于改良剂的单施效果。3)随着有机-无机改良剂施入量的增加,土壤中的Cl~-质量分数呈显著降低,而SO_4~(2-)质量分数呈显著增加趋势。4)根据试验结果,推荐施入1 kg/m~2的磷石膏及5%的有机改良剂(体积比,约3.35 kg/m~2),能够取得较好的改良效果,此时的改良成本约为6.70元/m~2。研究结果以期为滨海盐碱地区城市绿化,提供理论依据。
[Abstract]:In view of the high degree of salinization and outstanding toxicity of single salt in coastal saline-alkali land of Zhongjie Farm, Hebei Province, garden waste composting and inerting products were selected, and the soil improvement in this area was studied in combination with phosphogypsum. Based on the practical application under field conditions, different treatments were set up, field comparative experiments were carried out, regular sampling was carried out, and soil salt indexes were measured and analyzed. The results showed that: 1) the application of organic improver and phosphogypsum could not only effectively reduce the soil pH value, but also avoid the excessive change of soil pH value after the application of phosphogypsum alone, which had adverse effects on plants. 2) from the single factor analysis, The SAR of soil decreased significantly with the increase of organic modifier and phosphogypsum application, and the improvement effect of phosphogypsum was better than that of organic improver. From the interaction of the two modifiers, the effect of organic-inorganic modifiers was better than that of modifiers. 3) with the increase of organic-inorganic modifiers, the mass fraction of Cl~- in soil decreased significantly. However, the mass fraction of SO_4~ (2 -) increased significantly. 4) according to the experimental results, it is recommended that 1 kg/m~2 phosphogypsum and 5% organic modifier (volume ratio, about 3.35 kg/m~2) can achieve better improvement results. The improvement cost is about 6.70 yuan / m / m. The results of the study are expected to provide theoretical basis for urban greening in coastal saline-alkali areas.
【作者单位】：北京林业大学林学院;
【基金】：林业公益性行业科研专项项目“林业废弃物基质化研制技术与应用”(201504205)
【分类号】：S156.42

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