泥炭是栽培基质的主要成分,是一种珍贵的不可再生的化石材料。泥炭地提供重要的生态系统服务,并允许吸收和储存碳。保护泥炭地有助于应对气候变化,并有助于保护生物多样性。由于其重要性,有必要实施减少泥炭使用的策略,例如用基于生物质的替代生长培养基成分代替它,如泥炭藓。在这项研究中,我们比较了两种不同pH下的金属释放和结合特性,抗氧化活性,来自巴塔哥尼亚南部火地岛(TdF)地区的泥炭和泥炭藓的总酚含量。元素的水平通过电感耦合等离子体质谱法(ICP-MS)测定,同时使用傅立叶变换红外(FTIR)光谱表征和比较了官能团的类型和数量。使用Folin-Ciocalteu方法和2,2-二苯基-1-吡啶酰肼测试评估总酚水平和抗氧化能力。在pH=2时,泥炭中的可浸出元素浓度通常高于泥炭藓,Rb,Ti,和Zr。相比之下,在pH=5时,泥炭藓中所有浸出元素的含量最高。泥炭藓显示出比泥炭更高的金属吸附能力,除了Be,Mn,Tl,和Zn。最后,结果表明,两种基质的总酚含量相似:泥炭每克干样品为0.018±0.011mg没食子酸当量(GAE),泥炭藓为0.020±0.007mgGAEg-1。相反,泥炭藓提取物的抗氧化活性[0.026±0.028mmolTrolox当量(TE)g-1]明显高于泥炭中的估计(0.009±0.005mmolTEg-1)。腐殖酸,羧酸,与泥炭相比,酚类和木质素基团被确定为主要决定泥炭藓抗氧化活性的官能团。本研究提高了对这些材料的了解,以便将来进行更周到的使用和可能的替代。
Peat is the main constituent of cultivation substrates and a precious non-renewable fossil material. Peatlands provide important ecosystem services and allow the absorption and storage of carbon. Protecting peatlands helps tackle climate change and contributes to biodiversity conservation. Due to its importance, it is necessary to implement strategies to reduce the use of peat, such as replacing it with biomass-based alternative growing media constituents, such as Sphagnum moss. In this study, we compared the metal release and binding properties at two different pH, antioxidant activity, and total phenolic content of peat and Sphagnum moss from the Tierra del Fuego (TdF) region of southern Patagonia. Levels of the elements were determined by inductively coupled plasma mass spectrometry (ICP-MS), while the types and amounts of functional groups were characterized and compared using Fourier transform infrared (FTIR) spectroscopy. The total phenol level and antioxidant capacity were assessed using the Folin-Ciocalteu method and 2,2-diphenyl-1-picrylhydrazyl test. There are generally higher concentrations of leachable elements in peat than in Sphagnum moss at pH = 2, except Cs, Rb, Ti, and Zr. In contrast, at pH = 5, levels of all leached elements are highest in Sphagnum moss. Sphagnum moss shows a higher metal adsorption capacity than peat, except for Be, Mn, Tl, and Zn. Finally, the results showed that both matrices contained similar total phenolic contents: 0.018 ± 0.011 mg gallic acid equivalent (GAE) per gram dry sample for peat and 0.020 ± 0.007 mg GAE g-1 for Sphagnum moss. Instead, Sphagnum moss extracts showed a significantly higher antioxidant activity [0.026 ± 0.028 mmol Trolox equivalents (TE) g-1] than that estimated in peat (0.009 ± 0.005 mmol TE g-1). Humic acids, carboxylic acids, and phenolic and lignin groups were identified as the functional groups that mainly determined the antioxidant activity of the Sphagnum moss compared to peat. The present study resulted in an advancement of knowledge of these materials for more thoughtful future use and possible replacements.