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Aridity creates global thresholds in soil nitrogen retention and availability.
Elrys, Ahmed S; Abo El-Maati, Mohamed F; Dan, Xiaoqian; Wen, YuHong; Mou, Jinxia; Abdelghany, Ahmed Elsayed; Uwiragiye, Yves; Shuirong, Tang; Yanzheng, Wu; Meng, Lei; Zhang, JinBo; Müller, Christoph.
Afiliación
  • Elrys AS; College of Tropical Crops, Hainan University, Haikou, China.
  • Abo El-Maati MF; Soil Science Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt.
  • Dan X; Liebig Centre for Agroecology and Climate Impact Research, Justus Liebig University, Giessen, Germany.
  • Wen Y; Agriculture Biochemistry Department, Faculty of Agriculture, Zagazig University, Zagazig, Egypt.
  • Mou J; College of Tropical Crops, Hainan University, Haikou, China.
  • Abdelghany AE; College of Tropical Crops, Hainan University, Haikou, China.
  • Uwiragiye Y; College of Tropical Crops, Hainan University, Haikou, China.
  • Shuirong T; Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid, Areas of Ministry of Education, Northwest A&F University, Yangling, China.
  • Yanzheng W; Water Relation and Field Irrigation Department, Agriculture and Biological Institute, National Research Centre, Cairo, Egypt.
  • Meng L; Department of Agriculture, Faculty of Agriculture, Environmental Management and Renewable Energy, University of Technology and Arts of Byumba, Byumba, Rwanda.
  • Zhang J; School of Geography, Nanjing Normal University, Nanjing, China.
  • Müller C; College of Tropical Crops, Hainan University, Haikou, China.
Glob Chang Biol ; 30(1): e17003, 2024 Jan.
Article en En | MEDLINE | ID: mdl-37943245
Identifying tipping points in the relationship between aridity and gross nitrogen (N) cycling rates could show critical vulnerabilities of terrestrial ecosystems to climate change. Yet, the global pattern of gross N cycling response to aridity across terrestrial ecosystems remains unknown. Here, we collected 14,144 observations from 451 15 N-labeled studies and used segmented regression to identify the global threshold responses of soil gross N cycling rates and soil process-related variables to aridity index (AI), which decreases as aridity increases. We found on a global scale that increasing aridity reduced soil gross nitrate consumption but increased soil nitrification capacity, mainly due to reduced soil microbial biomass carbon (MBC) and N (MBN) and increased soil pH. Threshold response of gross N production and retention to aridity was observed across terrestrial ecosystems. In croplands, gross nitrification and extractable nitrate were inhibited with increasing aridity below the threshold AI ~0.8-0.9 due to inhibited ammonia-oxidizing archaea and bacteria, while the opposite was favored above this threshold. In grasslands, gross N mineralization and immobilization decreased with increasing aridity below the threshold AI ~0.5 due to decreased MBN, but the opposite was true above this threshold. In forests, increased aridity stimulated nitrate immobilization below the threshold AI ~1.0 due to increased soil C/N ratio, but inhibited ammonium immobilization above the threshold AI ~1.3 due to decreased soil total N and increased MBC/MBN ratio. Soil dissimilatory nitrate reduction to ammonium decreased with increasing aridity globally and in forests when the threshold AI ~1.4 was passed. Overall, we suggest that any projected increase in aridity in response to climate change is likely to reduce plant N availability in arid regions while enhancing it in humid regions, affecting the provision of ecosystem services and functions.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ecosistema / Compuestos de Amonio Idioma: En Revista: Glob Chang Biol Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Ecosistema / Compuestos de Amonio Idioma: En Revista: Glob Chang Biol Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Reino Unido