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

Abstract

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 (N2O) and methane (CH4) fluxes and SOC changes (ΔSOC) at a long-term, irrigated continuous corn (Zea mays L.) system in eastern Nebraska, United States. Here, 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 N2O 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 N2O 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 andmore » 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.« less

Authors:
ORCiD logo [1];  [1];  [2];  [3];  [1];  [1]
  1. Univ. of Nebraska, Lincoln, NE (United States)
  2. USDA‐ARS, Fort Collins, CO (United States)
  3. Univ. of Nebraska, Lincoln, NE (United States); Monsanto Company, Malcolm, NE (United States)
Publication Date:
Research Org.:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Bioenergy Technologies Office
OSTI Identifier:
1836054
Grant/Contract Number:  
EE0007088
Resource Type:
Accepted Manuscript
Journal Name:
Global Change Biology
Additional Journal Information:
Journal Volume: 23; Journal Issue: 7; Journal ID: ISSN 1354-1013
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; conventional tillage; global warming potential; greenhouse gas intensity; methane; nitrous oxide; no-till; soil organic carbon; stover removal

Citation Formats

Jin, Virginia L., Schmer, Marty R., Stewart, Catherine E., Sindelar, Aaron J., Varvel, Gary E., and Wienhold, Brian J. Long–term no–till and stover retention each decrease the global warming potential of irrigated continuous corn. United States: N. p., 2017. Web. doi:10.1111/gcb.13637.
Jin, Virginia L., Schmer, Marty R., Stewart, Catherine E., Sindelar, Aaron J., Varvel, Gary E., & Wienhold, Brian J. Long–term no–till and stover retention each decrease the global warming potential of irrigated continuous corn. United States. https://doi.org/10.1111/gcb.13637
Jin, Virginia L., Schmer, Marty R., Stewart, Catherine E., Sindelar, Aaron J., Varvel, Gary E., and Wienhold, Brian J. Mon . "Long–term no–till and stover retention each decrease the global warming potential of irrigated continuous corn". United States. https://doi.org/10.1111/gcb.13637. https://www.osti.gov/servlets/purl/1836054.
@article{osti_1836054,
title = {Long–term no–till and stover retention each decrease the global warming potential of irrigated continuous corn},
author = {Jin, Virginia L. and Schmer, Marty R. and Stewart, Catherine E. and Sindelar, Aaron J. and Varvel, Gary E. and Wienhold, Brian J.},
abstractNote = {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 (N2O) and methane (CH4) fluxes and SOC changes (ΔSOC) at a long-term, irrigated continuous corn (Zea mays L.) system in eastern Nebraska, United States. Here, 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 N2O 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 N2O 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.},
doi = {10.1111/gcb.13637},
journal = {Global Change Biology},
number = 7,
volume = 23,
place = {United States},
year = {Mon Jan 30 00:00:00 EST 2017},
month = {Mon Jan 30 00:00:00 EST 2017}
}

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