Please use this identifier to cite or link to this item: http://dspace.utpl.edu.ec/handle/123456789/19185
Title: Decoupling of soil nutrient cycles as a function of aridity in global drylands
Authors: Gusman Montalvan, E.
Espinosa íñiguez, C.
Keywords: carbon cycle
climate change
controlled study
desertification
litter decomposition
mineralization
nitrogen cycle
phosphorus cycle
priority journal
soil
soil erosion
soil moisture
weathering
metadata.dc.date.available: 2013-09-17
2017-06-16T22:03:06Z
Publisher: Nature
Abstract: The biogeochemical cycles of carbon (C), nitrogen (N) and phosphorus (P) are interlinked by primary production, respiration and decomposition in terrestrial ecosystems. It has been suggested that the C, N and P cycles could become uncoupled under rapid climate change because of the different degrees of control exerted on the supply of these elements by biological and geochemical processes. Climatic controls on biogeochemical cycles are particularly relevant in arid, semi-arid and dry sub-humid ecosystems (drylands) because their biological activity is mainly driven by water availability. The increase in aridity predicted for the twenty-first century in many drylands worldwide may therefore threaten the balance between these cycles, differentially affecting the availability of essential nutrients. Here we evaluate how aridity affects the balance between C, N and P in soils collected from 224 dryland sites from all continents except Antarctica. We find a negative effect of aridity on the concentration of soil organic C and total N, but a positive effect on the concentration of inorganic P. Aridity is negatively related to plant cover, which may favour the dominance of physical processes such as rock weathering, a major source of P to ecosystems, over biological processes that provide more C and N, such as litter decomposition. Our findings suggest that any predicted increase in aridity with climate change will probably reduce the concentrations of N and C in global drylands, but increase that of P. These changes would uncouple the C, N and P cycles in drylands and could negatively affect the provision of key services provided by these ecosystems. © 2013 Macmillan Publishers Limited.
metadata.dc.identifier.other: http://dx.doi.org/10.1038/nature12670
URI: http://dspace.utpl.edu.ec/handle/123456789/19185
ISBN: 280836
Other Identifiers: http://dx.doi.org/10.1038/nature12670
Other Identifiers: http://dx.doi.org/10.1038/nature12670
metadata.dc.language: Inglés
metadata.dc.type: Article
Appears in Collections:Artículos de revistas Científicas

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