Soluble iron nutrients in Saharan dust over the central Amazon rainforest

Soluble iron nutrients in Saharan dust over the central Amazon rainforest

Author Rizzolo, Joana A. Google Scholar
Barbosa, Cybelli G. G. Google Scholar
Borillo, Guilherme C. Google Scholar
Godoi, Ana F. L. Google Scholar
Souza, Rodrigo A. F. Google Scholar
Andreoli, Rita V. Google Scholar
Manzi, Antonio O. Google Scholar
Sa, Marta O. Google Scholar
Alves, Eliane G. Google Scholar
Poehlker, Christopher Google Scholar
Angelis, Isabella H. Google Scholar
Ditas, Florian Google Scholar
Saturno, Jorge Google Scholar
Moran-Zuloaga, Daniel Google Scholar
Rizzo, Luciana V. Autor UNIFESP Google Scholar
Rosario, Nilton E. Autor UNIFESP Google Scholar
Pauliquevis, Theotonio Autor UNIFESP Google Scholar
Santos, Rosa M. N. Google Scholar
Yamamoto, Carlos I. Google Scholar
Andreae, Meinrat O. Google Scholar
Artaxo, Paulo Google Scholar
Taylor, Philip E. Google Scholar
Godoi, Ricardo H. M. Google Scholar
Abstract The intercontinental transport of aerosols from the Sahara desert plays a significant role in nutrient cycles in the Amazon rainforest, since it carries many types of minerals to these otherwise low-fertility lands. Iron is one of the micronutrients essential for plant growth, and its long-range transport might be an important source for the iron-limited Amazon rainforest. This study assesses the bioavailability of iron Fe(II) and Fe(III) in the particulate matter over the Amazon forest, which was transported from the Sahara desert (for the sake of our discussion, this term also includes the Sahel region). The sampling campaign was carried out above and below the forest canopy at the ATTO site (Amazon Tall Tower Observatory), a near-pristine area in the central Amazon Basin, from March to April 2015. Measurements reached peak concentrations for soluble Fe(III) (48 ng m(-3)), Fe(II) (16 ng m(-3)), Na (470 ng m(-3)), Ca (194 ng m(-3)), K (65 ng m(-3)), and Mg (89 ng m(-3)) during a time period of dust transport from the Sahara, as confirmed by ground-based and satellite remote sensing data and air mass backward trajectories. Dust sampled above the Amazon canopy included primary biological aerosols and other coarse particles up to 12 mu m in diameter. Atmospheric transport of weathered Saharan dust, followed by surface deposition, resulted in substantial iron bioavailability across the rainforest canopy. The seasonal deposition of dust, rich in soluble iron, and other minerals is likely to assist both bacteria and fungi within the topsoil and on canopy surfaces, and especially benefit highly bioabsorbent species. In this scenario, Saharan dust can provide essential macronutrients and micronutrients to plant roots, and also directly to plant leaves. The influence of this input on the ecology of the forest canopy and topsoil is discussed, and we argue that this influence would likely be different from that of nutrients from the weathered Amazon bedrock, which otherwise provides the main source of soluble mineral nutrients.
xmlui.dri2xhtml.METS-1.0.item-coverage Gottingen
Language English
Sponsor Fundacao de Amparo a Pesquisa do Estado do Amazonas (FAPEAM)
Financiadora de Estudos e Projetos (FINEP)
Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
Fundacao Araucaria de Apoio ao Desenvolvimento Cientifico e Tecnologico do Parana
German Federal Ministry of Education and Research (BMBF)|Brazilian Ministerio da Ciencia, Tecnologia e Inovacao (MCTI/FINEP)
Grant number German Federal Ministry of Education and Research (BMBF): 01LB1001A
MCTI/FINEP: 01.11.01248.00
Date 2017
Published in Atmospheric Chemistry And Physics. Gottingen, v. 17, n. 4, p. 2673-2687, 2017.
ISSN 1680-7316 (Sherpa/Romeo, impact factor)
Publisher Copernicus Gesellschaft Mbh
Extent 2673-2687
Access rights Open access Open Access
Type Article
Web of Science ID WOS:000395094400001

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