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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Journal ArticleDOI
Feedback responses of soil greenhouse gas emissions to climate change are modulated by soil characteristics in dryland ecosystems
TL;DR: In this paper, the authors examined individual and interactive impacts of elevated CO2 (400ppm vs. 600ppm) and elevated temperature (ambient vs. −3°C increase) treatments on GHG fluxes, in three Australian dryland soils.
Journal ArticleDOI
Tillage practices improve rice yield and soil phosphorus fractions in two typical paddy soils
Waqas Ahmed,Muhammad Qaswar,Huang Jing,Dong Wenjun,Sun Geng,Liu Kailou,Meng Ying,Tang Ao,Sun Mei,Li Chao,Xu Yongmei,Sehrish Ali,Yodgar Normatov,Sajid Mehmood,Muhammad Numan Khan,Zhang Huimin +15 more
TL;DR: In this article, the status of phosphorus fractions in paddy soils in response to different tillage management practices under different rice-based cropping systems and environments was evaluated to better understand phosphorus behavior and assess the effects of various tillage practices on crop yield.
Journal ArticleDOI
Global patterns of soil heterotrophic respiration – A meta-analysis of available dataset
TL;DR: Based on the updated Global Soil Respiration Database, the authors conducted a meta-analysis to evaluate the direct and indirect effects of climatic, soil and vegetation controls on RH across the globe using structure equation model (SEM).
Journal ArticleDOI
The protective role of cyanobacteria on soil stability in two Aridisols in northeastern Iran
TL;DR: In this article, the importance of soil cyanobacteria on soil stability over different landforms was analyzed and the relationship between soil characteristics, stability and cyanobacterial presence was explored.
Journal ArticleDOI
A threshold reveals decoupled relationship of sulfur with carbon and nitrogen in soils across arid and semi-arid grasslands in northern China
Wentao Luo,Feike A. Dijkstra,Edith Bai,Jiao Feng,Xiao-Tao Lü,Chao Wang,Honghui Wu,Mai-He Li,Xingguo Han,Yong Jiang +9 more
TL;DR: In this article, the authors reported the results of S, C and N concentrations in 550 soil samples along a 3500-km aridity gradient across arid and semi-arid grasslands in northern China.