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首页> 外文期刊>Ecological research >Is metal hyperaccumulation occurring in ultramafic vegetation of central and southern Mexico?
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Is metal hyperaccumulation occurring in ultramafic vegetation of central and southern Mexico?

机译：墨西哥中部和南部的超镁铁质植被中是否发生金属过度富集？

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In Mexico, ultramafic complexes are present in different regions from the northwest (Baja California Norte) to the southeast (Chiapas). In this paper, we present the results of the exploration of three ultramafic (serpentine) habitats in central and southern Mexico: Cuicatlán–Concepción Pápalo (Oaxaca), Tehuitzingo–Tecomatlán (Puebla), and San Juan de Otates (Guanajuato). Previous geology studies showed that these complexes are mainly made up of serpentinized peridotites. Soil analyses demonstrated typical ultramafic characteristics such as high content of Mg in relation to Ca, and high concentrations of Fe, Cr, Co, and Ni. Soil samples from Oaxaca and Puebla had similar Ni contents around 2300 mg kg_(−1), while samples of Guanajuato showed the lowest Ni levels with an average of 200 mg kg_(−1)as well as for other metals such as Co, Cr, Mn, and Zn. During this study, 83 plant specimens were collected, of which 52 were identified at genus level and 40 at species level. The collected plants belong to 19 different families such as Anacardiaceae, Fabaceae, Acanthaceae, Asteraceae, Sterculiaceae, and Verbenaceae which are also widely present in other ultramafic areas in Iran, Brazil, Sri Lanka, and Costa Rica. Only two Mexican endemic species are included in the collection. Ni hyperaccumulators were not detected at any of the studied sites. Therefore, hyperaccumulation, as a tolerance mechanism of the flora in response to ultramafic geochemical stress, does not seem to be developed in Central Mexico, as observed in the close Costa Rican site of Santa Elena.
机译：在墨西哥，从西北部（北下加利福尼亚州）到东南部（恰帕斯州）的不同地区都存在超镁铁质复合物。在本文中，我们介绍了在墨西哥中部和南部三个超镁铁质（蛇形）生境的勘探结果：Cuicatlán–ConcepciónPápalo（瓦哈卡），Tehuitzingo–Tecomatlán（普埃布拉）和San Juan de Otates（瓜纳华托）。先前的地质研究表明，这些复合物主要由蛇纹岩化橄榄岩组成。土壤分析显示出典型的超镁铁质特征，例如相对于钙的镁含量高，以及高浓度的铁，铬，钴和镍。瓦哈卡州和普埃布拉州的土壤样品中Ni含量相似，约为2300 mg·kg _（-1），而瓜纳华托州的样品中Ni含量最低，平均为200 mg·kg _（-1）以及其他金属，例如Co，Cr ，Mn和Zn。在这项研究中，收集了83个植物标本，其中在属水平上鉴定了52个，在物种水平上鉴定了40个。收集的植物属于19种不同的科，如漆树科，豆科，菊科，菊科，硬皮科和马鞭草科，它们也广泛存在于伊朗，巴西，斯里兰卡和哥斯达黎加的其他超镁铁质地区。集合中仅包括两个墨西哥特有物种。在任何研究地点均未检测到Ni过度蓄积。因此，正如在圣埃琳娜附近哥斯达黎加地区观察到的那样，在墨西哥中部似乎没有出现过度积累作为植物群对超镁铁质地球化学胁迫的耐受机制。

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