Open Access
Decoupling of soil nutrient cycles as a function of
Manuel Delgado-Baquerizo,Fernando T. Maestre,Antonio Gallardo,Matthew A. Bowker,Matthew D. Wallenstein,José L. Quero,Victoria Ochoa,Beatriz Gozalo,Miguel García-Gómez,Santiago Soliveres,Pablo García-Palacios,Miguel Berdugo,Enrique Valencia,Cristina Escolar,Tulio Arredondo,Claudia Barraza-Zepeda,Donaldo Bran,José A. Carreira,Mohamed Chaieb,Abel A. Conceiça˜o,Mchich Derak,David J. Eldridge,Adrián Escudero,Carlos I. Espinosa,Juan José Gaitán,M. Gabriel Gatica,Susana Gómez-González,Elizabeth Guzman,Julio R. Gutiérrez,Adriana Florentino,E.N. Hepper,Rosa M. Hernández,Elisabeth Huber-Sannwald,Mohammad Jankju,Jushan Liu,Rebecca L. Mau,Maria N. Miriti,Jorge Monerris,Kamal Naseri,Zouhaier Noumi,Vicente Polo,Aníbal Prina,Eduardo Pucheta,Elizabeth Ramírez,David A. Ramırez Collantes,R. L. Romão,Matthew Tighe,Duilio Torres,Cristian Torres-Díaz,Eugene D. Ungar,James Val,Wanyoike Wamiti,Deli Wang,Eli Zaady +53 more
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In this paper, the authors evaluate how aridity affects the balance between carbon (C), nitrogen (N) and phosphorus (P) in soils collected from 224 dryland sites from all continents except Antarctica and find a negative effect of aridity on the concentration of soil organic C and total N, but a positive effect on inorganic P.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.read more
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DissertationDOI
Exploring the possibilities of parsimonious nitrogen modelling in different ecosystems
TL;DR: In this paper, two parsimonious nitrogen models have been developed and implemented in two different data availability scenarios, one in a semi-arid natural forest ecosystem and the other in an anthropogenic agricultural ecosystem.
Dissertation
Modelling of the topsoil organic carbon content by analysing the potential of spectroscopic techniques for digital soil mapping
TL;DR: In this article, the authors explored the capacity of spectroscopy for map soil organic carbon content at regional scale using topsoil samples from Galicia (NW-Spain) and developed a spatially non-stationary approach that allows mapping soil organic content and also identifying the factors more relevant for its accumulation in Europe.
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Governing Global Desertification: Linking Environmental Degradation, Poverty and Participation
TL;DR: The United Nations Convention to combat desertification in global sustainable development governance, Pierre Marc Johnson, Karel Mayrand, and Marc Paquin The scientific basis: links between land degradation, drought and desertification, Stefanie M Herrmann and Charles F. Hutchinson examined the links between poverty and land degradation as mentioned in this paper.
Journal ArticleDOI
Water availability and abundance of microbial groups are key determinants of greenhouse gas fluxes in a dryland forest ecosystem
TL;DR: In this article, the long-term effect of irrigation and fertilization on GHG emissions in a dryland ecosystem was quantified and the impact of land use change on N2O, CH4 and CO2 emissions and soil net global warming potential was investigated.
Journal ArticleDOI
Mineral N stock and nitrate accumulation in the 50 to 200 m profile on the Loess Plateau
Xiaoxu Jia,Yuanjun Zhu,Laiming Huang,Laiming Huang,Xiaorong Wei,Yunting Fang,Lianhai Wu,Andrew Binley,Mingan Shao,Mingan Shao +9 more
TL;DR: The accumulated nitrate introduced by human activities is thus mainly distributed in the upper vadose zone (above 30m), indicating, currently, a low nitrate leaching risk to groundwater due to a high storage capacity of the thick vadosed zone in the region.
Journal ArticleDOI
Changes in vegetation parameters and soil nutrients along degradation and recovery successions on alpine grasslands of the Tibetan plateau
TL;DR: In this paper, the above-ground vegetation and soil C, N and P concentrations and their stoichiometry in different degradation and recovery stages on the Tibetan Plateau were determined.
Journal ArticleDOI
The relationships between land uses, soil management practices, and soil carbon fractions in South Eastern Australia
S. M. Fazle Rabbi,Matthew Tighe,Annette Cowie,Brian Wilson,Brian Wilson,Graeme Schwenke,Malem McLeod,Warwick Badgery,Jeff Baldock +8 more
TL;DR: In this article, the authors identified the land uses and soil management practices that had significant impact on carbon stocks in soil after accounting for influences soil properties and environmental variables using a multivariate technique.