Environmental Science and Engineering, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, Canada V2N 4Z9.
Chemosphere. 2012 Jan;86(4):427-32. doi: 10.1016/j.chemosphere.2011.10.052. Epub 2011 Nov 21.
Fly ash (FA) and bottom ash (BA) from a softwood pellet boiler were characterized and evaluated as soil amendments. In a greenhouse study, two plant species (rye grass, Lolium perenne L. and oats, Avena sativa) were grown in three different treatments (1% FA, 1% BA, non-amended control) of a silty loam soil. Total concentrations of plant nutrients Ca, K, Mg, P and Zn in both ashes were elevated compared to conventional wood ash. Concentrations of Cd, Cr, Pb, Se and Zn were found to be elevated in the FA relative to BA and the non-amended soil. At 28 d, oat above-ground biomass was found to be significantly greater in soil amended with FA. Potassium and Mo plant tissue concentrations were significantly increased by addition of either ash, and FA significantly increased Zn tissue concentrations. Cadmium and Hg tissue concentrations were elevated in some cases. As soil amendments, either pellet ash is an effective liming agent and nutrient source, but high concentrations of Cd and Zn in FA may preclude its use as an agricultural soil amendment in some jurisdictions. Lower ash application rates than those used in this study (i.e. <1%) may still provide sufficient nutrients and effective neutralization of soil acidity.
从软木颗粒锅炉中提取的飞灰（FA）和底灰（BA）被用作土壤改良剂进行了特性评估。在温室研究中，两种植物（黑麦草，Lolium perenne L. 和燕麦，Avena sativa）在三种不同的处理（1% FA、1% BA、未改良对照）中种植在粉质壤土中。与传统的木灰相比，两种灰中植物营养元素 Ca、K、Mg、P 和 Zn 的总浓度均升高。FA 中的 Cd、Cr、Pb、Se 和 Zn 浓度相对于 BA 和未改良土壤而言升高。在 28 天，FA 改良土壤中燕麦地上生物量明显更大。添加任何一种灰都能显著增加钾和钼的植物组织浓度，FA 显著增加了 Zn 的植物组织浓度。在某些情况下，Cd 和 Hg 的组织浓度升高。作为土壤改良剂，颗粒灰都是有效的石灰和养分来源，但 FA 中高浓度的 Cd 和 Zn 可能会使其在某些司法管辖区无法用作农业土壤改良剂。与本研究中使用的灰分（<1%）相比，较低的灰分施用量可能仍能提供足够的养分和有效中和土壤酸度。
