河道疏浚底泥农业利用可行性分析

发布时间：2018-10-18 19:00

【摘要】：为探索河道疏浚底泥的农业利用可行性,通过盆栽试验分析了不同比例的河道疏浚底泥添加对土壤理化性质及玉米苗期生长的影响。结果表明,疏浚底泥添加能显著提高土壤有机质、碱解氮、速效磷和速效钾等养分,但同时重金属含量也增加。底泥与土壤添加比例达到1∶2时,玉米苗期的根长、株高、生物量、叶绿素及地上部分植株中累积的C、P含量显著提高;混合比例达到1∶1时,速效磷和速效钾含量远高于植物生长所需的营养水平,但全量Cd含量超过《土壤环境质量标准》(GB15618-2008)二级标准,植株体内C、P含量下降,叶绿素含量也低于对照。因此,河道疏浚底泥添加能显著提高土壤养分含量,促进植物生长,但添加比例不宜超过1∶1。
[Abstract]:In order to explore the feasibility of agricultural utilization of river dredged sediment, the effects of different proportion of river dredged sediment on soil physical and chemical properties and maize seedling growth were analyzed by pot experiment. The results showed that the addition of dredged sediment could significantly increase soil nutrients such as organic matter, alkali-hydrolyzed nitrogen, rapidly available phosphorus and available potassium, but the content of heavy metals also increased. When the ratio of sediment to soil reached 1:2, the root length, plant height, biomass, chlorophyll and the accumulation of CP in the aboveground part of the plant increased significantly, and when the mixing ratio reached 1:1, the root length, plant height, biomass, chlorophyll and the accumulation of CP in the aboveground part of the plant increased significantly. The contents of available phosphorus and potassium were much higher than the nutrient level needed for plant growth, but the total Cd content exceeded the second grade standard of soil Environmental quality Standard (GB15618-2008), and the content of CP and chlorophyll in the plant was lower than that of the control. Therefore, the addition of dredged sediment can significantly increase soil nutrient content and promote plant growth, but the addition ratio should not exceed 1: 1.
【作者单位】：贵阳学院生物与环境工程学院;中国电建贵阳勘测设计研究院;
【基金】：贵州省科学技术基金(黔科合J字[2013]2299号) 贵州省科学技术联合基金(黔科合J字[2014]7180号) 贵州省重点学科生态学项目(ZDXK[2013]08)
【分类号】：S141.6

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