Celestino Quintela-Sabarís, Adrián Fernández Dosouto, María Gómez-Brandón, Jorge Domínguez
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引用次数: 0
Abstract
Hyperaccumulator plants are a botanical curiosity that have allowed the development of agromining of metals, with a special focus on nickel. In nickel agromining, this element is recovered from ashed hyperaccumulators cultivated on metal-rich soils. In order to explore bio-based approaches for the decomposition of hyperaccumulator biomass and nickel recovery that do not include burning, we performed a vermicomposting experiment using the earthworm species Eisenia andrei and the biomass of Bornmuellera emarginata (which contained almost 1% of nickel). We conducted our experiment for 12 weeks and assessed the decomposition process of the hyperaccumulator biomass, changes in earthworm number and biomass, and changes in nickel concentration and mobility. Despite the initial mortality and an increase of Ni concentration in earthworm tissues, E. andrei was able to decompose B. emarginata biomass. This process also showed a massive colonization of the biomass by a fungus during the first weeks of the assay. Our results indicate that the vermicomposted hyperaccumulator biomass had a higher nickel concentration than the starting material but the diethylenetriaminepentaacetic acid-extractable nickel decreased. At the same time, due to earthworm activity, the nickel was redistributed and diluted in the vermicompost bedding, reducing the interest of this approach for agromining, but opening the perspective of using the vermicomposted hyperaccumulator biomass as an organic amendment in nickel-deficient crops.
超积累植物是一种植物学奇观,它使金属农用采矿业得以发展,特别是在镍方面。在镍的农用开采中,这种元素是从富含金属的土壤上种植的灰化超积累植物中回收的。为了探索以生物为基础的、不包括焚烧的超积累生物质分解和镍回收方法,我们利用蚯蚓物种 Eisenia andrei 和 Bornmuellera emarginata 的生物质(含镍近 1%)进行了蚯蚓堆肥实验。我们进行了为期 12 周的实验,评估了高积累生物质的分解过程、蚯蚓数量和生物量的变化以及镍浓度和流动性的变化。尽管最初蚯蚓死亡,蚯蚓组织中的镍浓度增加,但 E. andrei 仍能分解 B. emarginata 的生物量。这一过程还表明,在试验的最初几周,生物质中出现了大量的真菌定殖。我们的研究结果表明,蚯蚓堆肥的高积累生物质的镍浓度高于初始材料,但二乙烯三胺五乙酸可提取的镍却减少了。同时,由于蚯蚓的活动,镍在蚯蚓堆肥垫料中被重新分配和稀释,降低了这种方法在农用采矿方面的意义,但为将蚯蚓堆肥超积累生物质用作缺镍作物的有机添加剂开辟了前景。
期刊介绍:
Ecological Research has been published in English by the Ecological Society of Japan since 1986. Ecological Research publishes original papers on all aspects of ecology, in both aquatic and terrestrial ecosystems.