Long-term no-till and stover retention each decrease the global warming potential of irrigated continuous corn

Long-term no-till and stover retention each decrease the global warming potential of irrigated continuous corn

© 2017 John Wiley & Sons Ltd.

Détails bibliographiques
Publié dans:Global change biology. - 1999. - 23(2017), 7 vom: 05. Juli, Seite 2848-2862
Auteur principal: Jin, Virginia L (Auteur)
Autres auteurs: Schmer, Marty R, Stewart, Catherine E, Sindelar, Aaron J, Varvel, Gary E, Wienhold, Brian J
Format: Article en ligne
Langue:English
Publié: 2017
Accès à la collection:Global change biology
Sujets:Journal Article conventional tillage global warming potential greenhouse gas intensity methane nitrous oxide no-till soil organic carbon stover removal Soil plus... Nitrous Oxide K50XQU1029
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520 |a Over the last 50 years, the most increase in cultivated land area globally has been due to a doubling of irrigated land. Long-term agronomic management impacts on soil organic carbon (SOC) stocks, soil greenhouse gas (GHG) emissions, and global warming potential (GWP) in irrigated systems, however, remain relatively unknown. Here, residue and tillage management effects were quantified by measuring soil nitrous oxide (N2 O) and methane (CH4 ) fluxes and SOC changes (ΔSOC) at a long-term, irrigated continuous corn (Zea mays L.) system in eastern Nebraska, United States. Management treatments began in 2002, and measured treatments included no or high stover removal (0 or 6.8 Mg DM ha-1  yr-1 , respectively) under no-till (NT) or conventional disk tillage (CT) with full irrigation (n = 4). Soil N2 O and CH4 fluxes were measured for five crop-years (2011-2015), and ΔSOC was determined on an equivalent mass basis to ~30 cm soil depth. Both area- and yield-scaled soil N2 O emissions were greater with stover retention compared to removal and for CT compared to NT, with no interaction between stover and tillage practices. Methane comprised <1% of total emissions, with NT being CH4 neutral and CT a CH4 source. Surface SOC decreased with stover removal and with CT after 14 years of management. When ΔSOC, soil GHG emissions, and agronomic energy usage were used to calculate system GWP, all management systems were net GHG sources. Conservation practices (NT, stover retention) each decreased system GWP compared to conventional practices (CT, stover removal), but pairing conservation practices conferred no additional mitigation benefit. Although cropping system, management equipment/timing/history, soil type, location, weather, and the depth to which ΔSOC is measured affect the GWP outcomes of irrigated systems at large, this long-term irrigated study provides valuable empirical evidence of how management decisions can impact soil GHG emissions and surface SOC stocks 
650 4 |a Journal Article 
650 4 |a conventional tillage 
650 4 |a global warming potential 
650 4 |a greenhouse gas intensity 
650 4 |a methane 
650 4 |a nitrous oxide 
650 4 |a no-till 
650 4 |a soil organic carbon 
650 4 |a stover removal 
650 7 |a Soil  |2 NLM 
650 7 |a Nitrous Oxide  |2 NLM 
650 7 |a K50XQU1029  |2 NLM 
700 1 |a Schmer, Marty R  |e verfasserin  |4 aut 
700 1 |a Stewart, Catherine E  |e verfasserin  |4 aut 
700 1 |a Sindelar, Aaron J  |e verfasserin  |4 aut 
700 1 |a Varvel, Gary E  |e verfasserin  |4 aut 
700 1 |a Wienhold, Brian J  |e verfasserin  |4 aut 
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773 1 8 |g volume:23  |g year:2017  |g number:7  |g day:05  |g month:07  |g pages:2848-2862 
856 4 0 |u http://dx.doi.org/10.1111/gcb.13637  |3 Volltext 
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