Título
Human impacts and aridity differentially alter soil N availability in drylands worldwide
Autor
MANUEL DELGADO-BAQUERIZO
Fernando T Maestre
Antonio Gallardo
David Eldridge
Santiago Soliveres Codina
Matthew Bowker
Ana Prado Comesana
juan gaitan
Jose Luis Quero Pérez
Victoria Ochoa
Beatriz Gozalo
Miguel García Gómez
Pablo Garcia-Palacios
Miguel Berdugo
Enrique Valencia
Cristina Escolar
JOSE TULIO ARREDONDO MORENO
Claudia Elizabeth Barraza Zepeda
Bertrand R. Boeken
Donaldo Bran
Omar Cabrera
JOSÉ ANTONIO CARREIRA DE LA FUENTE
Mohamed Chaieb
Abel Conceição
Mchich Derak
Ricardo Ernst
Carlos Ivan Espinosa
Adriana Florentino de Andreu
Gabriel M. Gatica
Ghiloufi Wahida
Susana Gómez-González
Julio Roberto Gutiérrez Camus
Rosa Mary Hernández
Elisabeth Huber Sannwald
Mohammad Jankju
Rebecca L. Mau
Maria N. Miriti
Jorge Monerris
Ernesto F.A. Morici
Muchane Muchai
Kamal Naseri
Eduardo Pucheta
Elizabeth del Carmen Ramírez-Iglesias
David Ramirez
Roberto Lisboa Romao
Matthew Tighe
Duilio Gilberto Torres
Cristian Torres Díaz
James Val
José Pablo Veiga
Deli Wang
Xia Yuan
Eli Zaady
Nivel de Acceso
Acceso Abierto
Identificador alterno
doi: https://doi.org/10.1111/geb.12382
Materias
Aridity - (AUTOR) Depolymerization - (AUTOR) Global change - (AUTOR) Human impacts - (AUTOR) Mineralization - (AUTOR) N cycle - (AUTOR) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) CIENCIAS DE LA TIERRA Y DEL ESPACIO - (CTI) GEOGRAFÍA - (CTI) GEOGRAFÍA FÍSICA - (CTI) GEOGRAFÍA FÍSICA - (CTI)
Resumen o descripción
"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, 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."
Editor
Wiley
Fecha de publicación
2016
Tipo de publicación
Artículo
Versión de la publicación
Versión enviada
Recurso de información
Formato
application/pdf
Repositorio Orígen
Repositorio IPICYT
Descargas
248