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首页> 外文会议>Mine land reclamation and ecological restoration for the 21 century >THE USE OF NITROGEN-FIXING TREES TO REVEGETATE BAUXITE AND GOLD MINED AREAS IN THE TROPICS: CAN TREES SUBSTITUTE TOPSOIL RETURN?
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THE USE OF NITROGEN-FIXING TREES TO REVEGETATE BAUXITE AND GOLD MINED AREAS IN THE TROPICS: CAN TREES SUBSTITUTE TOPSOIL RETURN?

机译：利用固氮树在热带地区重新植被铝土矿和金矿区：树木可以替代坡顶土吗？

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摘要

The return of top soil has been used worldwide in reclamation programs of mined areas. The return of soil containing organic matter improves physical, chemical and biological conditions of the substrate and serves as source of biodiversity for the regeneration of the system. Besides the great importance of this procedure, strategic or economical factors sometimes limit its use. With the aim to evaluate the potential of nitrogen-fixing trees to revegetate mined areas without topsoil return, we carried out experiments in two different regions in Brazil: a bauxite mined area in the Amazon Region (Para State) and a gold mined area in the Cerrado Region (Minas Gerais State). More than thirty nodulating leguminous trees species were tested for an eight year period. Acacia holosericea, A. mangium, Sesbania virgata, Pseudosamanea guachapele, and Sclerolobium paniculatum presented high potential to improve the substrate, creating conditions for the successional process with great biodiversity of plant species. The importance of nodulated and mycorrhizal legume species are discussed in relation to substrate quality and sucessional biodiversity.
机译：表层土壤的回收已在全球范围内的雷区开垦计划中使用。包含有机物的土壤的回流改善了基质的物理，化学和生物学条件，并为系统的再生提供了生物多样性的来源。除了此程序的重要性外，策略或经济因素有时还会限制其使用。为了评估固氮树在没有表土返还的情况下重新植被雷区的潜力，我们在巴西的两个不同区域进行了实验：亚马逊地区（帕拉州）的铝土矿雷区和墨西哥州的铝土矿区。塞拉多地区（米纳斯吉莱斯州）。在八年的时间里测试了三十多种结节性豆科树种。阿拉伯树胶，马占相思，Se​​sbania virgata，Pseudosamanea guachapele和Sclerolobium paniculatum具有提高底物的巨大潜力，为具有大量植物物种多样性的演替过程创造了条件。讨论了结节性和菌根性豆科植物物种与基质质量和成功的生物多样性有关的重要性。

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