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https://hdl.handle.net/1959.11/18794
Title: | Human impacts and aridity differentially alter soil N availability in drylands worldwide | Contributor(s): | Delgado-Baquerizo, Manuel (author); Maestre, Fernando T (author); Gozalo, Beatriz (author); Garcia-Gomez, Miguel (author); Garcia-Palacios, Pablo (author); Berdugo, Miguel (author); Valencia, Enrique (author); Escolar, Cristina (author); Arredondo, Tulio (author); Barraza-Zepeda, Claudia (author); Boeken, Bertrand R (author); Bran, Donaldo (author); Gallardo, Antonio (author); Cabrera, Omar (author); Carreira, Jose A (author); Chaieb, Mohamed (author); Conceicao, Abel A (author); Derak, Mchich (author); Ernst, Ricardo (author); Espinosa, Carlos I (author); Florentino, Adriana (author); Gatica, Gabriel (author); Ghiloufi, Wahida (author); Eldridge, David J (author); Gomez-Gonzalez, Susana (author); Gutierrez, Julio R (author); Hernandez, Rosa M (author); Huber-Sannwald, Elisabeth (author); Jankju, Mohammad (author); Mau, Rebecca L (author); Miriti, Maria (author); Monerris, Jorge (author); Morici, Ernesto (author); Muchane, Muchai (author); Soliveres, Santiago (author); Naseri, Kamal (author); Pucheta, Eduardo (author); Ramirez, Elizabeth (author); Ramirez-Collantes, David A (author); Romao, Roberto L (author); Tighe, Matthew (author) ; Torres, Duilio (author); Torres-Diaz, Cristian (author); Val, James (author); Veiga, Jose P (author); Bowker, Matthew A (author); Wang, Deli (author); Yuan, Xia (author); Zaady, Eli (author); Prado-Comesana, Ana (author); Gaitan, Juan (author); Quero, Jose L (author); Ochoa, Victoria (author) | Publication Date: | 2016 | DOI: | 10.1111/geb.12382 | Handle Link: | https://hdl.handle.net/1959.11/18794 | Abstract: | 'Aims' Climate and human impacts are changing the nitrogen (N) inputs and losses in terrestrial ecosystems. However, it is largely unknown how these two major drivers of global change will simultaneously influence the N cycle in drylands, the largest terrestrial biome on the planet. We conducted a global observational study to evaluate how aridity and human impacts, together with biotic and abiotic factors, affect key soil variables of the N cycle. 'Location' Two hundred and twenty-four dryland sites from all continents except Antarctica widely differing in their environmental conditions and human influence. 'Methods' Using a standardized field survey, we measured aridity, human impacts (i.e. proxies of land uses and air pollution), key biophysical variables (i.e. soil pH and texture and total plant cover) and six important variables related to N cycling in soils: total N, organic N, ammonium, nitrate, dissolved organic:inorganic N and N mineralization rates.We used structural equation modelling to assess the direct and indirect effects of aridity, human impacts and key biophysical variables on the N cycle. Results Human impacts increased the concentration of total N, while aridity reduced it. The effects of aridity and human impacts on the N cycle were spatially disconnected,whichmay favour scarcity of N in the most arid areas and promote its accumulation in the least arid areas. 'Main conclusions' We found that increasing aridity and anthropogenic pressure are spatially disconnected in drylands. This implies that while places with low aridity and high human impact accumulate N, most arid sites with the lowest human impacts lose N. Our analyses also provide evidence that both increasing aridity and human impacts may enhance the relative dominance of inorganicNin dryland soils, having a negative impact on key functions and services provided by these ecosystems. | Publication Type: | Journal Article | Source of Publication: | Global Ecology and Biogeography, 25(1), p. 36-45 | Publisher: | Wiley-Blackwell Publishing Ltd | Place of Publication: | United Kingdom | ISSN: | 1466-8238 1466-822X |
Fields of Research (FoR) 2008: | 050304 Soil Chemistry (excl. Carbon Sequestration Science) 050302 Land Capability and Soil Degradation |
Fields of Research (FoR) 2020: | 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) 410601 Land capability and soil productivity |
Socio-Economic Objective (SEO) 2008: | 960303 Climate Change Models 960304 Climate Variability (excl. Social Impacts) 961406 Sparseland, Permanent Grassland and Arid Zone Soils |
Socio-Economic Objective (SEO) 2020: | 190501 Climate change models 190502 Climate variability (excl. social impacts) 180605 Soils |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article |
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