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| 植物中锌同位素的研究进展 |
| Progress in Research on Zn Isotopes in Plants |
| 投稿时间：2013-03-07 修订日期：2013-12-13 |
| DOI： |
| 中文关键词: 锌同位素;植物;分馏机理 |
| 英文关键词: zinc isotope;plant;fractionation mechanism |
| 基金项目:国家自然科学基金项目(41073017)中科院地球化学研究所矿床地球化学国家重点实验室开放基金项目(200912)。 |
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| 中文摘要: |
| 锌同位素是示踪植物中锌地球化学的重要手段,详细了解植物中锌同位素的分馏过程是探究其生物地球化学的关键。本文对目前研究程度较高的超富集植物、普通植物的锌同位素分馏成果进行了系统的总结,发现二者锌同位素分馏趋势基本一致,即相比于培养液或土壤的同位素组成,植物根部相对富集锌的重同位素,而植物地上部(如茎、叶等组织器官)相对富集锌的轻同位素。对于能够引起植物发生锌同位素分馏的因素归纳如下:(1)植物根部相对富集锌的重同位素,是土壤中锌的形态、根部对锌的吸收方式、细胞表面吸附共同作用的结果;(2)植物木质部对锌的向上运输,会随着传输距离的增加而使地上部组织器官相对富集锌的轻同位素;(3)大气沉降也可能导致叶片富集锌的轻同位素。 |
| 英文摘要: |
| Zinc isotopes are becoming an important proxy to trace the biogeochemical process of zinc in plants. In order to comprehensively investigate zinc biogeochemical processes between plants and soils, the mechanisms of zinc isotope fractionation should be well understood. This paper reviewed zinc isotopic variations in the hyper-accumulated and common plants, and their possible mechanisms leading to zinc isotope fractionation. The studies showed that plants had a similar fractionation trend that heavy isotope tends to be enriched in roots and depleted in shoots as compared with the soils or hydroponic solutions. The factors affecting zinc isotope fractionation in plants are summarized as follows:(1) The zinc heavy isotopes enriched in roots result from the proportions of different zinc speciations in soils, the way of zinc uptake by roots from the external and surface cell adsorption; (2) during the process of zinc transport upwards through xylem, the shoots generally tend to be enriched in light isotopes due to cell diffusion with increasing translocation distance; and (3) atmospheric deposition on leaves probably may make plants become enriched in zinc light isotope. |
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