摘要
采用原状土淋溶柱的方法,探讨了氮素在风沙土中的垂向迁移规律及对不同因素的响应特性,并提出了有效的控制措施。结果表明,在试验条件下,供试风沙土中添加的氮素有2/3左右通过垂向迁移作用流出土壤柱中。土壤浸出液与去离子水相比,前者作淋溶液时,氮素的总淋出量较后者增加6.3%;淋溶液pH值由6.4降至4.0,氮素的总淋出量增加8.3%;淋溶速度由3.0ml/min增至5.0ml/min,氮素的总淋出量增加9.2%。土壤有机质含量由9.1g/kg增至17.3g/kg,风沙土中添加的氮素总淋出量降低16.0%;在风沙土中按照15g/m2的比例添加淀粉接枝聚丙烯酸防渗剂后,氮素总淋出量降低33.3%,可有效控制风沙土中氮素的垂向迁移作用。
The method of undisturbed soil leaching column was adopted to explore the vertical migration patterns of nitrogen in aeolian sandy soil and the response characteristics of nitrogen to different factors,and the effective control measures were proposed in the experiment.The results showed that about two-thirds nitrogen which added in aeolian sandy soil entered the groundwater by the way of vertical migration under the test conditions.Compared with the deionized water,when the soil extract was used as leaching solution,the amount of nitrogen leaching would increase 6.3%.When the pH value of leaching solution was reduced from6.4to 4.0,the total amount of nitrogen leaching would increase 8.3%.When the leaching speed was increased from 3.0ml/min to 5.0ml/min,the total amount of nitrogen leaching would increase 9.2%.As the content of soil organic matter was increased from 9.1g/kg to 17.3g/kg,the total amount of nitrogen leaching in the aeolian sandy soil would reduce 16.0%.After adding the starch grafted polyacrylic acid seepage agent with a ratio of 15g/m2 in aeolian sandy soil,the total amount of nitrogen leaching would reduce 33.3%,and the vertical migration of nitrogen in aeolian sandy soil could be controlled effectively.
出处
《水土保持学报》
CSCD
北大核心
2015年第5期239-242,共4页
Journal of Soil and Water Conservation
基金
吉林省重大科技攻关专项(20130204054SF)
吉林省科技引导计划项目(20150412004XH)
关键词
风沙土
氮
原状土
防渗剂
有机质
aeolian sandy soil
nitrogen
undisturbed soil
anti-seepage agents
organic matter
