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Evolution of nitrogen cycling in regrowing Amazonian rainforest
Univ Fed Rio de Janeiro, Brazil; Univ Fed Fluminense, Brazil; Univ Fed Rio de Janeiro, Brazil.
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten. Univ Fed Rio de Janeiro, Brazil; Univ Fed Fluminense, Brazil; Univ Fed Rio de Janeiro, Brazil.
Univ Gothenburg, Sweden.
2019 (Engelska)Ingår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, artikel-id 8538Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Extensive regions of tropical forests are subjected to high rates of deforestation and forest regrowth and both are strongly affect soil nutrient cycling. Nitrogen (N) dynamics changes during forest regrowth and the recovery of forests and functioning similar to pristine conditions depends on sufficient N availability. We show that, in a chronosequence of Amazonian forests, gross nitrification and, as a result, nitrate-to-ammonium (NO3- : NH4+) ratio were lower in all stages of regrowing forests (10 to 40 years) compared to pristine forest. This indicates the evolution of a more conservative and closed N cycle with reduced risk for N leaking out of the ecosystem in regrowing forests. Furthermore, our results indicate that mineralization and nitrification are decoupled in young regrowing forests (10 years), such as that high gross mineralization is accompanied by low gross nitrification, demonstrating a closed N cycle that at the same time maintains N supply for forest regrowth. We conclude that the status of gross nitrification in disturbed soil is a key process to understand the mechanisms of and time needed for tropical forest recovery.

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NATURE PUBLISHING GROUP , 2019. Vol. 9, artikel-id 8538
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URN: urn:nbn:se:liu:diva-158874DOI: 10.1038/s41598-019-43963-4ISI: 000471215800016PubMedID: 31189968OAI: oai:DiVA.org:liu-158874DiVA, id: diva2:1337591
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Funding Agencies|FAPERJ NOTA 10 program; Strategic Research Area BECC (Biodiversity and Ecosystems services in a Changing Climate)

Tillgänglig från: 2019-07-16 Skapad: 2019-07-16 Senast uppdaterad: 2019-11-07

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