摘要
从可持续发展的角度出发,探索利用本地储量很大的碱渣、海底淤泥和粉煤灰做为园林绿化种植基质的可行性。比较分析海湾泥、粉煤灰和碱渣理化性质结果表明,海湾泥具备滨海海涂地的土壤特征,粘粒含量高,含盐量高,钠、氯离子占离子总量的绝对优势,含有较高的有机质和全氮;粉煤灰呈碱性,全盐含量较低,含有一定量的N、P、K和锰、铁、锌等微量元素;碱渣含有丰富的活性钙离子、多种植物所必需的中、微量元素和13%以上全盐含量。通过对3种物质的化学性质、矿物组成以及物理性质分析可知,它们单独存在时,均不能满足植物的生长,组合使用则可降低海湾泥容重,改善质地,有利于海湾泥脱盐,防止其脱盐碱化和土壤团聚体的形成,具有“优势互补”的效应。3种物质中,Cd、Cr、Hg、Pb等重金属含量均符合土壤环境质量,而As在海湾泥和粉煤灰中的含量较高,但按照适宜比例掺拌后的基质符合土壤环境质量要求,渗滤水的重金属含量也符合国家污水排放标准。植物年生长周期内还原糖、淀粉、蔗糖以及总碳水化合物动态变化分析结果表明该介质对植物生理代谢没有特殊的影响,可以满足植物的正常生长,是一种适宜于植物生长的新型种植基质。
Under sustainable development principle, the feasibility of using caustic sludge, dredged sediment and coal ash which were plentiful in the locality as landscaping plant medium was studied. The dredged sediment was characterized by having the physical and chemical characters of coastal soils, that is, the contents of clay and salt were high, Na^+ and Cl^- were absolutely dominated ions, it had more organic matters and total N. Coal ash which was alkaline had lower total salt content and contained some N, P, K and trace elements such as Mn, Fe and Zn. Caustic sludge had abundant active Ca^2+ and many kinds of necessary medium-sized trace elements, but the total salt content was more than 13%. The 3 wastes had complementary advantages when mixed reasonably, for example, reducing bulk density, bettering the character of dredged sediment, helping desalinate dredged sediment, keeping from desalting alkalization and forming the soil aggregates. The content of heavy metal of Cd, Cr, Hg, Pb etc. except As among 3 wastes met the standard of soil quality. Though being higher in dredged sediment and coal ash, As could fit the soil quality when being blended proportionally. The content of heavy metal in percolating water measured up to the criterion of sewage discharge as well. The dynamic analysis of reducing sugar, starch, sucrose and the total carbohydrates within one year growth cycle indicated that this medium had no special influences on plant physiology and metabolism and was able to meet the needs of growth.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第2期748-753,共6页
Journal of Agro-Environment Science
基金
国家重点科技项目(攻关)计划(96-920-21-07)
天津市科委资助项目(963109111)
关键词
碱渣
海湾泥
粉煤灰
种植介质
caustic sludge
dredged sediment
coal ash
plant medium