Wei Zhenggui, Gao Bin, Cheng Ka Yu, Kaksonen Anna H, Kolev Spas D, Wong Jonathan W C, Cui Jing
School of Environment, Nanjing Normal University, Nanjing, 210023, China.
Department of Agricultural and Biological Engineering, University of Florida, Gainesville, FL 32611, United States.
J Hazard Mater. 2020 Dec 5;400:123207. doi: 10.1016/j.jhazmat.2020.123207. Epub 2020 Jun 18.
This study examines a new method to dispose the biomass of a rare earth elements (REE) hyperaccumulator, Dicranopteris pedata, as a REE containing additive of a basal fertilizer for agricultural application. The D. pedata laminas were calcinated to fabricate ashes. The total REE content was 2.65 % for AshDp500, and 4.12 % for AshDp815, respectively. However, as for the heavy metals, Cd or Pb, a higher content could be found in AshDp500 than in AshDp815. The elemental contents of D. pedata ashes are qualified for fertilizer application. Pot experiments were then conducted to investigate the effects of AshDp815 on both the yield and quality of Ipomoea aquatica Forsskal grown in a yellow brown earth, or in a red soil. The application of the ashes increased the I. aquatica height, biomass, vitamin C, soluble protein, and soluble sugar contents, but decreased the I. aquatica nitrate and free amino acids contents. Furthermore, none of the microelements of I. aquatica leaf exceeded the Chinese national standard. The observations indicate the favorable effect of using D. pedata ash on the growth of I. aquatica which is most likely the result from the fertilizer effects of both macroelements and REE present in the ash.
本研究考察了一种处理稀土元素（REE）超富集植物芒萁生物量的新方法，即将其作为一种含稀土元素的基肥添加剂用于农业生产。对芒萁叶片进行煅烧以制备灰烬。AshDp500的稀土元素总含量为2.65%，AshDp815的稀土元素总含量为4.12%。然而，对于重金属镉或铅，AshDp500中的含量高于AshDp815。芒萁灰烬的元素含量符合肥料施用标准。随后进行盆栽试验，研究AshDp815对在黄棕壤或红壤中种植的蕹菜产量和品质的影响。施用灰烬增加了蕹菜的株高、生物量、维生素C、可溶性蛋白和可溶性糖含量，但降低了蕹菜的硝酸盐和游离氨基酸含量。此外，蕹菜叶片中的微量元素均未超过中国国家标准。这些观察结果表明，使用芒萁灰烬对蕹菜生长具有有利影响，这很可能是由于灰烬中大量元素和稀土元素的肥料效应所致。
