Meta-analysis on the potential for increasing nitrogen losses from intensifying tropical agriculture

Bibliographische Detailangaben
Veröffentlicht in:	Global change biology. - 1999. - 26(2020), 3 vom: 09. März, Seite 1668-1680
1. Verfasser:	Huddell, Alexandra M (VerfasserIn)
Weitere Verfasser:	Galford, Gillian L, Tully, Katherine L, Crowley, Cynthia, Palm, Cheryl A, Neill, Christopher, Hickman, Jonathan E, Menge, Duncan N L
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2020
Zugriff auf das übergeordnete Werk:	Global change biology
Schlagworte:	Journal Article Meta-Analysis Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. ammonia volatilization meta-analysis nitrate leaching nitric oxide nitrous oxide reactive nitrogen mehr... tropical agriculture Fertilizers Soil Nitrous Oxide K50XQU1029 Nitrogen N762921K75

Beschreibung
Zusammenfassung:	© 2020 John Wiley & Sons Ltd. Fertilized temperate croplands export large amounts of reactive nitrogen (N), which degrades water and air quality and contributes to climate change. Fertilizer use is poised to increase in the tropics, where widespread food insecurity persists and increased agricultural productivity will be needed, but much less is known about the potential consequences of increased tropical N fertilizer application. We conducted a meta-analysis of tropical field studies of nitrate leaching, nitrous oxide emissions, nitric oxide emissions, and ammonia volatilization totaling more than 1,000 observations. We found that the relationship between N inputs and losses differed little between temperate and tropical croplands, although total nitric oxide losses were higher in the tropics. Among the potential drivers we studied, the N input rate controlled all N losses, but soil texture and water inputs also controlled hydrological N losses. Irrigated systems had significantly higher losses of ammonia, and pasture agroecosystems had higher nitric oxide losses. Tripling of fertilizer N inputs to tropical croplands from 50 to 150 kg N ha-1 year-1 would have substantial environmental implications and would lead to increases in nitrate leaching (+30%), nitrous oxide emissions (+30%), nitric oxide (+66%) emissions, and ammonia volatilization (+74%), bringing tropical agricultural nitrate, nitrous oxide, and ammonia losses in line with temperate losses and raising nitric oxide losses above them
Beschreibung:	Date Completed 19.03.2020 Date Revised 19.03.2020 published: Print-Electronic Citation Status MEDLINE
ISSN:	1365-2486
DOI:	10.1111/gcb.14951