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Type: Journal article
Title: Roots, nitrogen transformations, and ecosystem services
Author: Jackson, L.
Burger, M.
Cavagnaro, T.
Citation: Plant Biology, 2008; 59(1):341-363
Publisher: Georg Thieme Verlag
Issue Date: 2008
ISSN: 1435-8603
Statement of
Louise E. Jackson, Martin Burger, and Timothy R. Cavagnaro
Abstract: This review considers some of the mechanistic processes that involve roots in the soil nitrogen (N) cycle, and their implications for the ecological functions that retain N within ecosystems: 1) root signaling pathways for N transport systems, and feedback inhibition, especially for NO3− uptake; 2) dependence on the mycorrhizal and Rhizobium/legume symbioses and their tradeoffs for N acquisition; 3) soil factors that influence the supply of NH4+ and NO3− to roots and soil microbes; and 4) rhizosphere processes that increase N cycling and retention, such as priming effects and interactions with the soil food web. By integrating information on these plant-microbe-soil N processes across scales and disciplinary boundaries, we propose ideas for better manipulating ecological functions and processes by which the environment provides for human needs, i.e., ecosystem services. Emphasis is placed on agricultural systems, effects of N deposition in natural ecosystems, and ecosystem responses to elevated CO2 concentrations. This shows the need for multiscale approaches to increase human dependence on a biologically based N supply.
Keywords: ammonium; arbuscular mycorrhizae; elevated carbon dioxide concentration; nitrate; nitrogen cycle; rhizosphere
Rights: Copyright © 2008 by Annual Reviews. All rights reserved
RMID: 0020138411
DOI: 10.1146/annurev.arplant.59.032607.092932
Appears in Collections:Earth and Environmental Sciences publications

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