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Type: Artigo
Title: Global Overview On Nitrogen Dynamics In Mangroves And Consequences Of Increasing Nitrogen Availability For These Systems
Author: Goncalves Reis
Carla Roberta; Nardoto
Gabriela Bielefeld; Oliveira
Rafael Silva
Abstract: Mangroves provide several ecosystem goods and services to society. However, mangroves are frequently subjected to land conversion, overharvesting, and pollution including increased nitrogen (N) availability. Aiming to provide useful information to predict effects of N enrichment on mangroves, we evaluated literature data on N transformation rates in sediment, dissolved N (DN) fluxes across the sediment-water interface, and natural abundance of N stable isotopes (delta N-15) in the sediment-plant system in conserved mangroves and those subjected to anthropogenic N enrichment. Mangroves and terrestrial tropical forests exhibit a great overlap in rates of biological N fixation (BNF) and denitrification and nitrous oxide flux rates. Mangroves can be highly efficient users of DN forms from tidal waters, related to rapid plant uptake and an efficient conservation of DN in sediment by microbial activity. The main factors limiting N transformation rates in mangrove sediment are inorganic DN availability and microbial immobilization. The delta N-15 data indicated that fringe forests exhibit higher N transformation rates in sediment and higher N losses to atmosphere, compared to other mangrove types. Except for BNF, all other N transformation and flux rates seem to be intensified by increasing N availability.
Subject: Biological Nitrogen Fixation
Nitrogen Mineralization
Sediment-water Interface Fluxes
Nitrous Oxide
Nitrogen Stable Isotopes
Editor: Springer
Citation: Plant And Soil. Springer, v. 410, p. 1 - 19, 2017.
Rights: fechado
Identifier DOI: 10.1007/s11104-016-3123-7
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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