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首页> 美国卫生研究院文献>Annals of Botany >Is it worth hyperaccumulating Ni on non-serpentine soils? Decomposition dynamics of mixed-species litters containing hyperaccumulated Ni across serpentine and non-serpentine environments
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Is it worth hyperaccumulating Ni on non-serpentine soils? Decomposition dynamics of mixed-species litters containing hyperaccumulated Ni across serpentine and non-serpentine environments

机译：是否值得在非蛇纹石土壤上超积镍？蛇形和非蛇形环境中含高积累镍的混合种类垫料的分解动力学

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>Background and Aims Nickel (Ni)-hyperaccumulating species produce high-Ni litters and may potentially influence important ecosystem processes such as decomposition. Although litters resembling the natural community conditions are essential in order to predict decomposition dynamics, decomposition of mixed-species litters containing hyperaccumulated Ni has never been studied. This study aims to test the effect of different litter mixtures containing hyperaccumulated Ni on decomposition and Ni release across serpentine and non-serpentine soils.>Methods Three different litter mixtures were prepared based on the relative abundance of the dominant species in three serpentine soils in the island of Lesbos, Greece where the Ni-hyperaccumulator Alyssum lesbiacum is present. Each litter mixture decomposed on its original serpentine habitat and on an adjacent non-serpentine habitat, in order to investigate whether the decomposition rates differ across the contrasted soils. In order to make comparisons across litter mixtures and to investigate whether additive or non-additive patterns of mass loss occur, a control non-serpentine site was used. Mass loss and Ni release were measured after 90, 180 and 270 d of field exposure.>Key Results The decomposition rates and Ni release had higher values on serpentine soils after all periods of field exposure. The recorded rapid release of hyperaccumulated Ni is positively related to the initial litter Ni concentration. No differences were found in the decomposition of the three different litter mixtures at the control non-serpentine site, while their patterns of mass loss were additive.>Conclusions Our results: (1) demonstrate the rapid decomposition of litters containing hyperaccumulated Ni on serpentine soils, indicating the presence of metal-tolerant decomposers; and (2) imply the selective decomposition of low-Ni parts of litters by the decomposers on non-serpentine soils. This study provides support for the elemental allelopathy hypothesis of hyperaccumulation, presenting the potential selective advantages acquired by metal-hyperaccumulating plants through litter decomposition on serpentine soils.
机译：>背景和目标：镍（Ni）超富集物种产生高Ni凋落物，并可能影响重要的生态系统过程，例如分解。尽管类似于自然群落条件的凋落物对于预测分解动力学是必不可少的，但从未研究过含有高积累Ni的混合物种凋落物的分解。本研究旨在测试含镍过多的不同凋落物混合物对蛇纹石和非蛇形土壤中分解和镍释放的影响。>方法根据优势种的相对丰度，制备了三种不同的凋落物混合物在希腊莱斯博斯岛的三种蛇形土壤中，存在镍超蓄积性香雪草lesbiacum。每种凋落物混合物都会在其原始的蛇形栖息地和相邻的非蛇形栖息地上分解，以便研究在对比的土壤中分解速率是否不同。为了在垃圾混合物中进行比较并调查是否发生了质量损失的累加或非累加模式，使用了对照非蛇纹石部位。在田间暴露90、180和270 d后测量质量损失和Ni释放。>主要结果在所有田间暴露后，蛇形土壤的分解速率和Ni释放值均较高。所记录的快速释放的高积累镍与初始垫料镍浓度呈正相关。对照的非蛇纹石部位的三种不同凋落物混合物的分解没有发现差异，而它们的质量损失模式是累加的。>结论：我们的结果：（1）证明了凋落物的快速分解。蛇形土壤中含有超积累的镍，表明存在耐金属分解剂； （2）暗示分解剂会在非蛇形土壤上选择性分解垃圾中的低镍部分。这项研究为过度积累的元素化感作用假说提供了支持，并提出了金属过度积累植物通过在蛇形土壤上分解凋落物而获得的潜在选择性优势。

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