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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TLDR
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.
References
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Journal ArticleDOI
Patterns of plant functional variation and specialization along secondary succession and topography in a tropical dry forest
Lucía Sanaphre-Villanueva,Juan Manuel Dupuy,José Luis Andrade,Cassandra Reyes-García,Paula C. Jackson,Horacio Paz +5 more
TL;DR: Analysis of 14 functional traits from 65 dominant species indicated that generalists varied from acquisitive strategies of light and water early in succession to conservative strategies in older forests and on hills, indicating that long-term human disturbance may have favored generalists, but this did not result in functional homogenization.
Journal ArticleDOI
Human impacts and aridity differentially alter soil N availability in drylands worldwide
Manuel Delgado-Baquerizo,Manuel Delgado-Baquerizo,Fernando T. Maestre,Antonio Gallardo,David J. Eldridge,Santiago Soliveres,Santiago Soliveres,Matthew A. Bowker,Ana Prado-Comesaña,Juan José Gaitán,José L. Quero,Victoria Ochoa,Beatriz Gozalo,Miguel García-Gómez,Pablo García-Palacios,Pablo García-Palacios,Miguel Berdugo,Enrique Valencia,Cristina Escolar,Tulio Arredondo,Claudia Barraza-Zepeda,Bertrand Boeken,Donaldo Bran,Omar Cabrera,José A. Carreira,Mohamed Chaieb,Abel Augusto Conceição,Mchich Derak,Ricardo Daniel Ernst,Carlos I. Espinosa,Adriana Florentino,Gabriel Gatica,Wahida Ghiloufi,Susana Gómez-González,Julio R. Gutiérrez,Rosa M. Hernández,Elisabeth Huber-Sannwald,Mohammad Jankju,Rebecca L. Mau,Maria N. Miriti,Jorge Monerris,Ernesto Morici,Muchai Muchane,Kamal Naseri,Eduardo Pucheta,Elizabeth Ramírez,David A. Ramírez-Collantes,R. L. Romão,Matthew Tighe,Duilio Torres,Cristian Torres-Díaz,James Val,José P. Veiga,Deli Wang,Xia Yuan,Eli Zaady +55 more
TL;DR: In this article, the authors conducted a global observational study to evaluate how aridity and human impacts, together with biotic and abiotic factors, affect key soil variables of the nitrogen cycle.
Journal ArticleDOI
Phosphorus transformations along a soil/vegetation series of fire-prone, dolomitic, semi-arid shrublands of southern Spain Soil P and Mediterranean shrubland dynamic
TL;DR: In this paper, the authors studied P transformations in a series of semi-arid, dolomitic shrublands in southeastern Spain, ranging from a frequently-burned, open gorse-scrubland on eroded Typic Xerorthents to a long-unburned mature garrigue on Entic Haploxerolls.
Journal ArticleDOI
Depth profiles of soil carbon isotopes along a semi-arid grassland transect in northern China
Chao Wang,Haiwei Wei,Dongwei Liu,Wentao Luo,Jianfeng Hou,Weixin Cheng,Weixin Cheng,Xingguo Han,Edith Bai +8 more
TL;DR: In this paper, the stable carbon isotope (δ13C) of plant and soil depth profile was used to examine decomposition rates of organic carbon (SOC) decomposition in semi-arid grasslands.
Journal ArticleDOI
Livestock activity increases exotic plant richness, but wildlife increases native richness, with stronger effects under low productivity
David J. Eldridge,Manuel Delgado-Baquerizo,Samantha K. Travers,James Val,Ian Oliver,Josh W. Dorrough,Santiago Soliveres +6 more
TL;DR: It is shown that livestock grazing increases exotic species richness but reduces native richness, while kangaroo grazing increases native richness in environments with low productivity, providing clear messages for land managers and policy makers.