The uptake of Ni and other elements by Callitris glaucophylla (white cypress pine), from weathered ultramafic rocks under varying depths of transported regolith cover, is examined at two sites in the Miandetta area, New South Wales, Australia. Results show that C. glaucophylla can accumulate elevated Ni concentrations in the needles (leaves or phyllodes) from underlying Ni-enriched regolith up to two orders of magnitude above the normal micronutrient levels required for the species. Such uptake levels occur in areas with high total Ni in the soil and regolith despite the relatively low mobility of the Ni due to its presence in a low availability form. This highlights the importance of biotic processes in extracting Ni from soil. The needles of C. glaucophylla could provide an effective and convenient sampling medium for reconnaissance biogeochemical exploration for Ni mineralisation and anomalies where transported regolith is less than ~3 m thick. The study has also demonstrated the potential for in situ analysis of Ni and other elements in the needles by portable XRF.

中文翻译：

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澳大利亚 Miandetta 地区 Cypress Pine (Callitris glaucophylla) 对镍的吸收：对生物地球化学勘探的影响

在澳大利亚新南威尔士州 Miandetta 地区的两个地点，研究了Callitris glaucophylla（白柏松）从风化的超镁铁质岩石在不同深度的迁移风化层覆盖下吸收 Ni 和其他元素的情况。结果表明，C. glaucophylla可以在富含 Ni 的风化层的针叶（叶子或叶状体）中积累升高的 Ni 浓度，比该物种所需的正常微量营养素水平高两个数量级。这种吸收水平发生在土壤和风化层中总镍含量高的区域，尽管镍的流动性相对较低，因为它以低可用性形式存在。这突出了生物过程在从土壤中提取镍的重要性。C. glaucophylla的针叶可以为运移风化层小于~3 m 的镍矿化和异常的侦察生物地球化学勘探提供有效和方便的采样介质。该研究还证明了通过便携式 XRF 对针中的 Ni 和其他元素进行原位分析的潜力。