This work aimed to investigate the metal accumulation characteristics as well as biogeochemical changes in the rhizosphere and root foraging strategies of this plant species. Previous reports suggested that Noccaea rotundifolia ssp. cepaeifolia is a Zn, Cd and Pb hyperaccumulator. We used hydroponic, rhizobox and split-pot experiments for studying metal accumulation and related rhizosphere processes. Although this species accumulated up to 1250 mg Pb kg⁻¹ and 27,000 mg Zn kg⁻¹ in shoots, translocation factors <1 do not meet the hyperaccumulation criteria. Substantial increases in Ca(NO₃)₂-extractable metals in the N. rotundifolia rhizosphere of a metal-spiked soil can be explained by proton release from N. rotundifolia roots to maintain the charge balance during excessive metal uptake; this was not observed for the non-spiked, moderately contaminated control soil. Specific rhizosphere mechanisms targeting the alleviation of metal toxicity in N. rotundifolia rhizosphere were not detected. Generally, N. rotundifolia had larger total root and shoot mass in soils with heterogeneous distribution of Zn and Pb relative to homogeneous treatments, associated with less root mass placed in metal-enriched patches. However, the avoidance strategy was not reflected by low shoot metal concentrations. Metal accumulation rates and translocation factors do not meet the criteria for hyperaccumulation. Changes of pH and DOC in N. rotundifolia rhizosphere were apparently not involved in targeted immobilisation or detoxification of Pb, Zn and Cd. Avoidance of metal-rich patches in soil is a major tolerance strategy of N. rotundifolia.

这项工作旨在调查该植物物种在根际中的金属积累特征以及生物地球化学变化和根觅食策略。先前的报道表明夜蛾属夜蛾属。Ç epaeifolia是将Zn，Cd和Pb超富集。我们使用了水培，根际和分锅实验来研究金属积累和相关的根际过程。尽管该物种在芽中积累了高达1250 mg Pb kg ^-1和27,000 mg Zn kg ^-1，但易位因子<1不满足超积累标准。圆叶猪笼草中Ca（NO ₃）_2可提取金属的大量增加掺入金属的土壤的根际可以用轮状猪笼草根的质子释放来保持过量摄取金属时的电荷平衡。对于未加标，中等污染的对照土壤则未观察到此现象。未检测到针对减轻圆叶猪笼草根际金属毒性的特定根际机制。通常，圆叶猪笼草与均质处理相比，锌和铅的分布不均的土壤具有更大的总根和芽总质量，而在富含金属的斑块中放置的根却较少。但是，避免策略并未反映在低的芽金属浓度上。金属积累速率和易位因子不符合超积累标准。圆叶猪笼草根际中pH和DOC的变化显然与Pb，Zn和Cd的靶向固定或解毒无关。避免土壤中富含金属的斑块是圆叶猪笼草的主要耐受策略。