Please use this identifier to cite or link to this item: http://dspace.utpl.edu.ec/jspui/handle/123456789/18954
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dc.contributor.authorCabrera Cisneros, H.es_ES
dc.contributor.authorEspinosa íñiguez, C.es_ES
dc.date.accessioned2017-06-16T22:02:40Z-
dc.date.available2017-06-16T22:02:40Z-
dc.date.issued2016-01-01es_ES
dc.identifier10.1111/geb.12382es_ES
dc.identifier.isbn1466822Xes_ES
dc.identifier.other10.1111/geb.12382es_ES
dc.identifier.urihttp://dspace.utpl.edu.ec/handle/123456789/18954-
dc.description.abstractAims: 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, which may 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 inorganic N in dryland soils, having a negative impact on key functions and services provided by these ecosystems.es_ES
dc.languageIngléses_ES
dc.subjectAridityes_ES
dc.subjectDepolymerizationes_ES
dc.subjectGlobal changees_ES
dc.subjectHuman impactses_ES
dc.subjectMineralizationes_ES
dc.subjectN cyclees_ES
dc.titleHuman impacts and aridity differentially alter soil N availability in drylands worldwidees_ES
dc.typeArticlees_ES
dc.publisherGlobal Ecology and Biogeographyes_ES
Appears in Collections:Artículos de revistas Científicas



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