Madejón P, Xiong J, Cabrera F, Madejón E
Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, P.O. Box 1052, 41080 Sevilla, Spain.
Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), CSIC, Avenida Reina Mercedes 10, P.O. Box 1052, 41080 Sevilla, Spain.
J Environ Manage. 2014 Nov 1;144:176-85. doi: 10.1016/j.jenvman.2014.05.020. Epub 2014 Jun 18.
The use of fast growing trees could be an alternative in trace element contaminated soils to stabilize these elements and improve soil quality. In this study we investigate the effect of Paulownia fortunei growth on trace element contaminated soils amended with two organic composts under semi-field conditions for a period of 18 months. The experiment was carried out in containers filled with tree different soils, two contaminated soils (neutral AZ and acid V) and a non contaminated soil, NC. Three treatments per soil were established: two organic amendments (alperujo compost, AC, and biosolid compost, BC) and a control without amendment addition. We study parameters related with fertility and contamination in soils and plants. Paulownia growth and amendments increased pH in acid soils whereas no effect of these factors was observed in neutral soils. The plant and the amendments also increased organic matter and consequently, soil fertility. Positive results were also found in soils that were only affected by plant growth (without amendment). A general improvement of "soil biochemical quality" was detected over time and treatments, confirming the positive effect of amendments plus paulownia. Even in contaminated soils, except for Cu and Zn, trace element concentrations in leaves were in the normal range for plants. Results of this mid-term study showed that Paulownia fortunei is a promising species for phytoremediation of trace element polluted soils.
种植速生树木可能是一种处理微量元素污染土壤的替代方法，可使这些元素稳定下来并改善土壤质量。在本研究中，我们在半田间条件下，研究了18个月内，两种有机堆肥改良的微量元素污染土壤上泡桐的生长效应。实验在装有三种不同土壤的容器中进行，两种污染土壤（中性的AZ和酸性的V）和一种未污染土壤NC。每种土壤设置三个处理：两种有机改良剂（alperujo堆肥，AC，和生物固体堆肥，BC）和一个不添加改良剂的对照。我们研究了与土壤和植物肥力及污染相关的参数。泡桐生长和改良剂提高了酸性土壤的pH值，而在中性土壤中未观察到这些因素的影响。植物和改良剂还增加了土壤有机质，从而提高了土壤肥力。在仅受植物生长影响（无改良剂）的土壤中也发现了积极结果。随着时间推移和不同处理，检测到“土壤生化质量”普遍改善，证实了改良剂加泡桐的积极效果。即使在污染土壤中，除铜和锌外，叶片中的微量元素浓度也在植物的正常范围内。这项中期研究结果表明，泡桐是一种很有前景的用于修复微量元素污染土壤的植物。
