PDF(Pubmed)
Abstract：
The biogeochemical cycles of trace elements are changed by fire as a result of the mineralization of organic matter. Monitoring the accumulation of trace elements in both the environment and the tree biomass during the post-fire (PF) forest ecosystem regeneration process is important for tree species selection for reforestation in ecosystems under anthropogenic pressure. We analyzed the soil concentrations of different groups of potentially toxic elements (PTEs), including beneficial (Al), toxic (Cd, Cr, Pb), and microelements (Cu, Mn, Ni, Zn), and their bioaccumulation in the tree species (Pinus sylvestris, Betula pendula, Alnus glutinosa) biomass introduced after a fire in a forest weakened by long-term emissions of industrial pollutants. The results indicated no direct threat from the PTEs tested at the PF site. The tree species introduced 30 years ago may have modified the biogeochemical cycles of the PTEs through different strategies of bioaccumulation in the belowground and aboveground biomass. Alder had relatively high Al concentrations in the roots and a low translocation factor (TF). Pine and birch had lower Al concentrations in the roots and higher TFs. Foliage concentrations and the TF of Cd increased from alder to pine to birch. However, the highest concentration and bioaccumulation factor of Cd was found in the alder roots. The concentrations of Cr in the foliage and the Cr TFs in the studied species increased from pine to birch to alder. Higher concentrations of Cu and Ni were found in the foliage of birch and alder than of pine. Among the species, birch also had the highest Pb and Zn concentrations in the roots and foliage. We found that different tree species had different patterns of PTE phytostabilization and ways they incorporated these elements into the biological cycle, and these patterns were not dependent on fire disturbance. This suggests that similar patterns might also occur in more polluted soils. Therefore, species-dependent bioaccumulation patterns could also be used to design phytostabilization and remediation treatments for polluted sites under industrial pressure.
摘要：
微量元素的生物地球化学循环由于有机物的矿化而被火改变。在火灾后（PF）森林生态系统再生过程中，监测环境和树木生物量中微量元素的积累对于选择树木物种以在人为压力下在生态系统中进行造林非常重要。我们分析了不同组的潜在有毒元素（PTE）的土壤浓度，包括有益的(Al)，有毒(Cd，Cr,Pb),和微量元素(铜，Mn,Ni,Zn),以及它们在树种中的生物积累(樟子松，Betulapendula,Alnusglutinosa）森林大火后引入的生物量因工业污染物的长期排放而减弱。结果表明在PF位点测试的PTE没有直接威胁。30年前引入的树种可能通过在地下和地上生物量中的不同生物积累策略改变了PTE的生物地球化学循环。Alder的根中Al浓度相对较高，易位因子（TF）较低。松树和桦树根中的Al浓度较低，而TFs较高。从al木到松树再到桦树，叶片浓度和Cd的TF增加。然而,Cd的浓度和生物积累因子最高的是在the根中。从松树到桦树再到al木，叶子中的Cr浓度和所研究物种中的CrTFs浓度增加。在桦木和al木的叶子中发现的Cu和Ni浓度高于松木。在物种中，桦木在根部和叶子中的Pb和Zn浓度最高。我们发现不同的树种具有不同的PTE植物稳定模式，以及它们将这些元素纳入生物循环的方式，这些模式不依赖于火灾干扰。这表明类似的模式也可能发生在污染更严重的土壤中。因此,依赖物种的生物积累模式也可用于在工业压力下设计受污染地点的植物稳定和修复处理。
